commit 0641a95770cd20be20a1b2702cd96b33a6a466fb
Author: speedie <speedie@speedie.site>
Date:   Sun May 5 23:31:42 2024 +0200

    Initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..7194ea7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+.cache
+build
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..b8ef161
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,83 @@
+cmake_minimum_required(VERSION 3.1...3.29)
+
+project(docpp LANGUAGES CXX VERSION 0.0.1)
+
+if (MSVC)
+    set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
+endif()
+
+set_property(GLOBAL PROPERTY CXX_STANDARD 17)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+add_library(${PROJECT_NAME} SHARED)
+
+target_sources(${PROJECT_NAME} PRIVATE
+    "src/docpp.cpp"
+)
+
+target_include_directories(${PROJECT_NAME} PRIVATE "${PROJECT_SOURCE_DIR}")
+
+set_target_properties(${PROJECT_NAME} PROPERTIES
+    VERSION ${PROJECT_VERSION}
+    SOVERSION ${PROJECT_VERSION}
+    PUBLIC_HEADER "include/docpp.hpp"
+)
+
+install(TARGETS ${PROJECT_NAME}
+    EXPORT ${PROJECT_NAME}Targets
+    FILE_SET HEADERS
+    LIBRARY DESTINATION lib
+    ARCHIVE DESTINATION lib
+    RUNTIME DESTINATION bin
+    PUBLIC_HEADER DESTINATION include/docpp
+    INCLUDES DESTINATION include)
+
+set(INCLUDE_INSTALL_DIR include/)
+
+include(CMakePackageConfigHelpers)
+write_basic_package_version_file(
+    "${PROJECT_NAME}ConfigVersion.cmake"
+    VERSION ${PROJECT_VERSION}
+    COMPATIBILITY AnyNewerVersion)
+
+install(EXPORT ${PROJECT_NAME}Targets
+    FILE ${PROJECT_NAME}Targets.cmake
+    NAMESPACE docpp::
+    DESTINATION lib/cmake/${PROJECT_NAME})
+
+install(FILES "${PROJECT_SOURCE_DIR}/cmake/${PROJECT_NAME}Config.cmake"
+    "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}ConfigVersion.cmake"
+    DESTINATION lib/cmake/${PROJECT_NAME})
+
+if (!${ENABLE_TESTS})
+    return()
+else()
+    enable_testing()
+endif()
+
+find_package(Catch2 3 REQUIRED)
+
+add_executable(${PROJECT_NAME}_test
+    tests/test.cpp
+)
+
+target_include_directories(${PROJECT_NAME}_test PRIVATE
+    "${PROJECT_SOURCE_DIR}"
+)
+
+target_link_libraries(${PROJECT_NAME}_test PRIVATE
+    Catch2::Catch2WithMain
+)
+
+include(CTest)
+include(Catch)
+catch_discover_tests(${PROJECT_NAME}_test)
+
+add_custom_command(
+     TARGET ${PROJECT_NAME}_test
+     COMMENT "Run tests"
+     POST_BUILD
+     WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
+     COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure --rerun-failed -C
+     $<CONFIGURATION> -R "^${PROJECT_NAME}_test$"
+)
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..0a04128
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,165 @@
+                   GNU LESSER GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+
+  This version of the GNU Lesser General Public License incorporates
+the terms and conditions of version 3 of the GNU General Public
+License, supplemented by the additional permissions listed below.
+
+  0. Additional Definitions.
+
+  As used herein, "this License" refers to version 3 of the GNU Lesser
+General Public License, and the "GNU GPL" refers to version 3 of the GNU
+General Public License.
+
+  "The Library" refers to a covered work governed by this License,
+other than an Application or a Combined Work as defined below.
+
+  An "Application" is any work that makes use of an interface provided
+by the Library, but which is not otherwise based on the Library.
+Defining a subclass of a class defined by the Library is deemed a mode
+of using an interface provided by the Library.
+
+  A "Combined Work" is a work produced by combining or linking an
+Application with the Library.  The particular version of the Library
+with which the Combined Work was made is also called the "Linked
+Version".
+
+  The "Minimal Corresponding Source" for a Combined Work means the
+Corresponding Source for the Combined Work, excluding any source code
+for portions of the Combined Work that, considered in isolation, are
+based on the Application, and not on the Linked Version.
+
+  The "Corresponding Application Code" for a Combined Work means the
+object code and/or source code for the Application, including any data
+and utility programs needed for reproducing the Combined Work from the
+Application, but excluding the System Libraries of the Combined Work.
+
+  1. Exception to Section 3 of the GNU GPL.
+
+  You may convey a covered work under sections 3 and 4 of this License
+without being bound by section 3 of the GNU GPL.
+
+  2. Conveying Modified Versions.
+
+  If you modify a copy of the Library, and, in your modifications, a
+facility refers to a function or data to be supplied by an Application
+that uses the facility (other than as an argument passed when the
+facility is invoked), then you may convey a copy of the modified
+version:
+
+   a) under this License, provided that you make a good faith effort to
+   ensure that, in the event an Application does not supply the
+   function or data, the facility still operates, and performs
+   whatever part of its purpose remains meaningful, or
+
+   b) under the GNU GPL, with none of the additional permissions of
+   this License applicable to that copy.
+
+  3. Object Code Incorporating Material from Library Header Files.
+
+  The object code form of an Application may incorporate material from
+a header file that is part of the Library.  You may convey such object
+code under terms of your choice, provided that, if the incorporated
+material is not limited to numerical parameters, data structure
+layouts and accessors, or small macros, inline functions and templates
+(ten or fewer lines in length), you do both of the following:
+
+   a) Give prominent notice with each copy of the object code that the
+   Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the object code with a copy of the GNU GPL and this license
+   document.
+
+  4. Combined Works.
+
+  You may convey a Combined Work under terms of your choice that,
+taken together, effectively do not restrict modification of the
+portions of the Library contained in the Combined Work and reverse
+engineering for debugging such modifications, if you also do each of
+the following:
+
+   a) Give prominent notice with each copy of the Combined Work that
+   the Library is used in it and that the Library and its use are
+   covered by this License.
+
+   b) Accompany the Combined Work with a copy of the GNU GPL and this license
+   document.
+
+   c) For a Combined Work that displays copyright notices during
+   execution, include the copyright notice for the Library among
+   these notices, as well as a reference directing the user to the
+   copies of the GNU GPL and this license document.
+
+   d) Do one of the following:
+
+       0) Convey the Minimal Corresponding Source under the terms of this
+       License, and the Corresponding Application Code in a form
+       suitable for, and under terms that permit, the user to
+       recombine or relink the Application with a modified version of
+       the Linked Version to produce a modified Combined Work, in the
+       manner specified by section 6 of the GNU GPL for conveying
+       Corresponding Source.
+
+       1) Use a suitable shared library mechanism for linking with the
+       Library.  A suitable mechanism is one that (a) uses at run time
+       a copy of the Library already present on the user's computer
+       system, and (b) will operate properly with a modified version
+       of the Library that is interface-compatible with the Linked
+       Version.
+
+   e) Provide Installation Information, but only if you would otherwise
+   be required to provide such information under section 6 of the
+   GNU GPL, and only to the extent that such information is
+   necessary to install and execute a modified version of the
+   Combined Work produced by recombining or relinking the
+   Application with a modified version of the Linked Version. (If
+   you use option 4d0, the Installation Information must accompany
+   the Minimal Corresponding Source and Corresponding Application
+   Code. If you use option 4d1, you must provide the Installation
+   Information in the manner specified by section 6 of the GNU GPL
+   for conveying Corresponding Source.)
+
+  5. Combined Libraries.
+
+  You may place library facilities that are a work based on the
+Library side by side in a single library together with other library
+facilities that are not Applications and are not covered by this
+License, and convey such a combined library under terms of your
+choice, if you do both of the following:
+
+   a) Accompany the combined library with a copy of the same work based
+   on the Library, uncombined with any other library facilities,
+   conveyed under the terms of this License.
+
+   b) Give prominent notice with the combined library that part of it
+   is a work based on the Library, and explaining where to find the
+   accompanying uncombined form of the same work.
+
+  6. Revised Versions of the GNU Lesser General Public License.
+
+  The Free Software Foundation may publish revised and/or new versions
+of the GNU Lesser General Public License from time to time. Such new
+versions will be similar in spirit to the present version, but may
+differ in detail to address new problems or concerns.
+
+  Each version is given a distinguishing version number. If the
+Library as you received it specifies that a certain numbered version
+of the GNU Lesser General Public License "or any later version"
+applies to it, you have the option of following the terms and
+conditions either of that published version or of any later version
+published by the Free Software Foundation. If the Library as you
+received it does not specify a version number of the GNU Lesser
+General Public License, you may choose any version of the GNU Lesser
+General Public License ever published by the Free Software Foundation.
+
+  If the Library as you received it specifies that a proxy can decide
+whether future versions of the GNU Lesser General Public License shall
+apply, that proxy's public statement of acceptance of any version is
+permanent authorization for you to choose that version for the
+Library.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..14cf185
--- /dev/null
+++ b/README.md
@@ -0,0 +1,27 @@
+# docpp
+
+Small C++ library for generating XML, HTML and CSS.
+
+## Installation
+
+To install the library, you can utilize the provided CMakeLists.txt file:
+
+```sh
+mkdir build
+cd build
+cmake ..
+cmake --build .
+cmake --install . --prefix /usr
+```
+
+## Usage
+
+Just include docpp.hpp in your project and link against the library. Examples can be found in the examples directory.
+
+## License
+
+This project is licensed under the GNU Lesser General Public License v3.0 - see the [LICENSE.md](LICENSE.md) file for details.
+
+## Code of Conduct
+
+None. Just don't blow up my house.
diff --git a/cmake/Catch.cmake b/cmake/Catch.cmake
new file mode 100644
index 0000000..8f30688
--- /dev/null
+++ b/cmake/Catch.cmake
@@ -0,0 +1,304 @@
+# Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
+# file Copyright.txt or https://cmake.org/licensing for details.
+
+#[=======================================================================[.rst:
+Catch
+-----
+
+This module defines a function to help use the Catch test framework.
+
+The :command:`catch_discover_tests` discovers tests by asking the compiled test
+executable to enumerate its tests.  This does not require CMake to be re-run
+when tests change.  However, it may not work in a cross-compiling environment,
+and setting test properties is less convenient.
+
+This command is intended to replace use of :command:`add_test` to register
+tests, and will create a separate CTest test for each Catch test case.  Note
+that this is in some cases less efficient, as common set-up and tear-down logic
+cannot be shared by multiple test cases executing in the same instance.
+However, it provides more fine-grained pass/fail information to CTest, which is
+usually considered as more beneficial.  By default, the CTest test name is the
+same as the Catch name; see also ``TEST_PREFIX`` and ``TEST_SUFFIX``.
+
+.. command:: catch_discover_tests
+
+  Automatically add tests with CTest by querying the compiled test executable
+  for available tests::
+
+    catch_discover_tests(target
+                         [TEST_SPEC arg1...]
+                         [EXTRA_ARGS arg1...]
+                         [WORKING_DIRECTORY dir]
+                         [TEST_PREFIX prefix]
+                         [TEST_SUFFIX suffix]
+                         [PROPERTIES name1 value1...]
+                         [TEST_LIST var]
+                         [REPORTER reporter]
+                         [OUTPUT_DIR dir]
+                         [OUTPUT_PREFIX prefix]
+                         [OUTPUT_SUFFIX suffix]
+                         [DISCOVERY_MODE <POST_BUILD|PRE_TEST>]
+    )
+
+  ``catch_discover_tests`` sets up a post-build command on the test executable
+  that generates the list of tests by parsing the output from running the test
+  with the ``--list-test-names-only`` argument.  This ensures that the full
+  list of tests is obtained.  Since test discovery occurs at build time, it is
+  not necessary to re-run CMake when the list of tests changes.
+  However, it requires that :prop_tgt:`CROSSCOMPILING_EMULATOR` is properly set
+  in order to function in a cross-compiling environment.
+
+  Additionally, setting properties on tests is somewhat less convenient, since
+  the tests are not available at CMake time.  Additional test properties may be
+  assigned to the set of tests as a whole using the ``PROPERTIES`` option.  If
+  more fine-grained test control is needed, custom content may be provided
+  through an external CTest script using the :prop_dir:`TEST_INCLUDE_FILES`
+  directory property.  The set of discovered tests is made accessible to such a
+  script via the ``<target>_TESTS`` variable.
+
+  The options are:
+
+  ``target``
+    Specifies the Catch executable, which must be a known CMake executable
+    target.  CMake will substitute the location of the built executable when
+    running the test.
+
+  ``TEST_SPEC arg1...``
+    Specifies test cases, wildcarded test cases, tags and tag expressions to
+    pass to the Catch executable with the ``--list-test-names-only`` argument.
+
+  ``EXTRA_ARGS arg1...``
+    Any extra arguments to pass on the command line to each test case.
+
+  ``WORKING_DIRECTORY dir``
+    Specifies the directory in which to run the discovered test cases.  If this
+    option is not provided, the current binary directory is used.
+
+  ``TEST_PREFIX prefix``
+    Specifies a ``prefix`` to be prepended to the name of each discovered test
+    case.  This can be useful when the same test executable is being used in
+    multiple calls to ``catch_discover_tests()`` but with different
+    ``TEST_SPEC`` or ``EXTRA_ARGS``.
+
+  ``TEST_SUFFIX suffix``
+    Similar to ``TEST_PREFIX`` except the ``suffix`` is appended to the name of
+    every discovered test case.  Both ``TEST_PREFIX`` and ``TEST_SUFFIX`` may
+    be specified.
+
+  ``PROPERTIES name1 value1...``
+    Specifies additional properties to be set on all tests discovered by this
+    invocation of ``catch_discover_tests``.
+
+  ``TEST_LIST var``
+    Make the list of tests available in the variable ``var``, rather than the
+    default ``<target>_TESTS``.  This can be useful when the same test
+    executable is being used in multiple calls to ``catch_discover_tests()``.
+    Note that this variable is only available in CTest.
+
+  ``REPORTER reporter``
+    Use the specified reporter when running the test case. The reporter will
+    be passed to the Catch executable as ``--reporter reporter``.
+
+  ``OUTPUT_DIR dir``
+    If specified, the parameter is passed along as
+    ``--out dir/<test_name>`` to Catch executable. The actual file name is the
+    same as the test name. This should be used instead of
+    ``EXTRA_ARGS --out foo`` to avoid race conditions writing the result output
+    when using parallel test execution.
+
+  ``OUTPUT_PREFIX prefix``
+    May be used in conjunction with ``OUTPUT_DIR``.
+    If specified, ``prefix`` is added to each output file name, like so
+    ``--out dir/prefix<test_name>``.
+
+  ``OUTPUT_SUFFIX suffix``
+    May be used in conjunction with ``OUTPUT_DIR``.
+    If specified, ``suffix`` is added to each output file name, like so
+    ``--out dir/<test_name>suffix``. This can be used to add a file extension to
+    the output e.g. ".xml".
+
+  ``DL_PATHS path...``
+    Specifies paths that need to be set for the dynamic linker to find shared
+    libraries/DLLs when running the test executable (PATH/LD_LIBRARY_PATH respectively).
+    These paths will both be set when retrieving the list of test cases from the
+    test executable and when the tests are executed themselves. This requires
+    cmake/ctest >= 3.22.
+
+  `DISCOVERY_MODE mode``
+    Provides control over when ``catch_discover_tests`` performs test discovery.
+    By default, ``POST_BUILD`` sets up a post-build command to perform test discovery
+    at build time. In certain scenarios, like cross-compiling, this ``POST_BUILD``
+    behavior is not desirable. By contrast, ``PRE_TEST`` delays test discovery until
+    just prior to test execution. This way test discovery occurs in the target environment
+    where the test has a better chance at finding appropriate runtime dependencies.
+
+    ``DISCOVERY_MODE`` defaults to the value of the
+    ``CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE`` variable if it is not passed when
+    calling ``catch_discover_tests``. This provides a mechanism for globally selecting
+    a preferred test discovery behavior without having to modify each call site.
+
+#]=======================================================================]
+
+#------------------------------------------------------------------------------
+function(catch_discover_tests TARGET)
+
+  cmake_parse_arguments(
+    ""
+    ""
+    "TEST_PREFIX;TEST_SUFFIX;WORKING_DIRECTORY;TEST_LIST;REPORTER;OUTPUT_DIR;OUTPUT_PREFIX;OUTPUT_SUFFIX;DISCOVERY_MODE"
+    "TEST_SPEC;EXTRA_ARGS;PROPERTIES;DL_PATHS"
+    ${ARGN}
+  )
+
+  if(NOT _WORKING_DIRECTORY)
+    set(_WORKING_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}")
+  endif()
+  if(NOT _TEST_LIST)
+    set(_TEST_LIST ${TARGET}_TESTS)
+  endif()
+  if (_DL_PATHS)
+    if(${CMAKE_VERSION} VERSION_LESS "3.22.0")
+        message(FATAL_ERROR "The DL_PATHS option requires at least cmake 3.22")
+    endif()
+  endif()
+  if(NOT _DISCOVERY_MODE)
+    if(NOT CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE)
+      set(CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE "POST_BUILD")
+    endif()
+    set(_DISCOVERY_MODE ${CMAKE_CATCH_DISCOVER_TESTS_DISCOVERY_MODE})
+  endif()
+  if (NOT _DISCOVERY_MODE MATCHES "^(POST_BUILD|PRE_TEST)$")
+    message(FATAL_ERROR "Unknown DISCOVERY_MODE: ${_DISCOVERY_MODE}")
+  endif()
+
+  ## Generate a unique name based on the extra arguments
+  string(SHA1 args_hash "${_TEST_SPEC} ${_EXTRA_ARGS} ${_REPORTER} ${_OUTPUT_DIR} ${_OUTPUT_PREFIX} ${_OUTPUT_SUFFIX}")
+  string(SUBSTRING ${args_hash} 0 7 args_hash)
+
+  # Define rule to generate test list for aforementioned test executable
+  set(ctest_file_base "${CMAKE_CURRENT_BINARY_DIR}/${TARGET}-${args_hash}")
+  set(ctest_include_file "${ctest_file_base}_include.cmake")
+  set(ctest_tests_file "${ctest_file_base}_tests.cmake")
+
+  get_property(crosscompiling_emulator
+    TARGET ${TARGET}
+    PROPERTY CROSSCOMPILING_EMULATOR
+  )
+
+  if(_DISCOVERY_MODE STREQUAL "POST_BUILD")
+    add_custom_command(
+      TARGET ${TARGET} POST_BUILD
+      BYPRODUCTS "${ctest_tests_file}"
+      COMMAND "${CMAKE_COMMAND}"
+              -D "TEST_TARGET=${TARGET}"
+              -D "TEST_EXECUTABLE=$<TARGET_FILE:${TARGET}>"
+              -D "TEST_EXECUTOR=${crosscompiling_emulator}"
+              -D "TEST_WORKING_DIR=${_WORKING_DIRECTORY}"
+              -D "TEST_SPEC=${_TEST_SPEC}"
+              -D "TEST_EXTRA_ARGS=${_EXTRA_ARGS}"
+              -D "TEST_PROPERTIES=${_PROPERTIES}"
+              -D "TEST_PREFIX=${_TEST_PREFIX}"
+              -D "TEST_SUFFIX=${_TEST_SUFFIX}"
+              -D "TEST_LIST=${_TEST_LIST}"
+              -D "TEST_REPORTER=${_REPORTER}"
+              -D "TEST_OUTPUT_DIR=${_OUTPUT_DIR}"
+              -D "TEST_OUTPUT_PREFIX=${_OUTPUT_PREFIX}"
+              -D "TEST_OUTPUT_SUFFIX=${_OUTPUT_SUFFIX}"
+              -D "TEST_DL_PATHS=${_DL_PATHS}"
+              -D "CTEST_FILE=${ctest_tests_file}"
+              -P "${_CATCH_DISCOVER_TESTS_SCRIPT}"
+      VERBATIM
+    )
+
+    file(WRITE "${ctest_include_file}"
+      "if(EXISTS \"${ctest_tests_file}\")\n"
+      "  include(\"${ctest_tests_file}\")\n"
+      "else()\n"
+      "  add_test(${TARGET}_NOT_BUILT-${args_hash} ${TARGET}_NOT_BUILT-${args_hash})\n"
+      "endif()\n"
+    )
+
+  elseif(_DISCOVERY_MODE STREQUAL "PRE_TEST")
+
+    get_property(GENERATOR_IS_MULTI_CONFIG GLOBAL
+        PROPERTY GENERATOR_IS_MULTI_CONFIG
+    )
+
+    if(GENERATOR_IS_MULTI_CONFIG)
+      set(ctest_tests_file "${ctest_file_base}_tests-$<CONFIG>.cmake")
+    endif()
+
+    string(CONCAT ctest_include_content
+      "if(EXISTS \"$<TARGET_FILE:${TARGET}>\")"                                    "\n"
+      "  if(NOT EXISTS \"${ctest_tests_file}\" OR"                                 "\n"
+      "     NOT \"${ctest_tests_file}\" IS_NEWER_THAN \"$<TARGET_FILE:${TARGET}>\" OR\n"
+      "     NOT \"${ctest_tests_file}\" IS_NEWER_THAN \"\${CMAKE_CURRENT_LIST_FILE}\")\n"
+      "    include(\"${_CATCH_DISCOVER_TESTS_SCRIPT}\")"                           "\n"
+      "    catch_discover_tests_impl("                                             "\n"
+      "      TEST_EXECUTABLE"        " [==[" "$<TARGET_FILE:${TARGET}>"   "]==]"   "\n"
+      "      TEST_EXECUTOR"          " [==[" "${crosscompiling_emulator}" "]==]"   "\n"
+      "      TEST_WORKING_DIR"       " [==[" "${_WORKING_DIRECTORY}"      "]==]"   "\n"
+      "      TEST_SPEC"              " [==[" "${_TEST_SPEC}"              "]==]"   "\n"
+      "      TEST_EXTRA_ARGS"        " [==[" "${_EXTRA_ARGS}"             "]==]"   "\n"
+      "      TEST_PROPERTIES"        " [==[" "${_PROPERTIES}"             "]==]"   "\n"
+      "      TEST_PREFIX"            " [==[" "${_TEST_PREFIX}"            "]==]"   "\n"
+      "      TEST_SUFFIX"            " [==[" "${_TEST_SUFFIX}"            "]==]"   "\n"
+      "      TEST_LIST"              " [==[" "${_TEST_LIST}"              "]==]"   "\n"
+      "      TEST_REPORTER"          " [==[" "${_REPORTER}"               "]==]"   "\n"
+      "      TEST_OUTPUT_DIR"        " [==[" "${_OUTPUT_DIR}"             "]==]"   "\n"
+      "      TEST_OUTPUT_PREFIX"     " [==[" "${_OUTPUT_PREFIX}"          "]==]"   "\n"
+      "      TEST_OUTPUT_SUFFIX"     " [==[" "${_OUTPUT_SUFFIX}"          "]==]"   "\n"
+      "      CTEST_FILE"             " [==[" "${ctest_tests_file}"        "]==]"   "\n"
+      "      TEST_DL_PATHS"          " [==[" "${_DL_PATHS}"               "]==]"   "\n"
+      "      CTEST_FILE"             " [==[" "${CTEST_FILE}"              "]==]"   "\n"
+      "    )"                                                                      "\n"
+      "  endif()"                                                                  "\n"
+      "  include(\"${ctest_tests_file}\")"                                         "\n"
+      "else()"                                                                     "\n"
+      "  add_test(${TARGET}_NOT_BUILT ${TARGET}_NOT_BUILT)"                        "\n"
+      "endif()"                                                                    "\n"
+    )
+
+    if(GENERATOR_IS_MULTI_CONFIG)
+      foreach(_config ${CMAKE_CONFIGURATION_TYPES})
+        file(GENERATE OUTPUT "${ctest_file_base}_include-${_config}.cmake" CONTENT "${ctest_include_content}" CONDITION $<CONFIG:${_config}>)
+      endforeach()
+      string(CONCAT ctest_include_multi_content
+        "if(NOT CTEST_CONFIGURATION_TYPE)"                                              "\n"
+        "  message(\"No configuration for testing specified, use '-C <cfg>'.\")"        "\n"
+        "else()"                                                                        "\n"
+        "  include(\"${ctest_file_base}_include-\${CTEST_CONFIGURATION_TYPE}.cmake\")"  "\n"
+        "endif()"                                                                       "\n"
+      )
+      file(GENERATE OUTPUT "${ctest_include_file}" CONTENT "${ctest_include_multi_content}")
+    else()
+      file(GENERATE OUTPUT "${ctest_file_base}_include.cmake" CONTENT "${ctest_include_content}")
+      file(WRITE "${ctest_include_file}" "include(\"${ctest_file_base}_include.cmake\")")
+    endif()
+  endif()
+
+  if(NOT ${CMAKE_VERSION} VERSION_LESS "3.10.0")
+    # Add discovered tests to directory TEST_INCLUDE_FILES
+    set_property(DIRECTORY
+      APPEND PROPERTY TEST_INCLUDE_FILES "${ctest_include_file}"
+    )
+  else()
+    # Add discovered tests as directory TEST_INCLUDE_FILE if possible
+    get_property(test_include_file_set DIRECTORY PROPERTY TEST_INCLUDE_FILE SET)
+    if (NOT ${test_include_file_set})
+      set_property(DIRECTORY
+        PROPERTY TEST_INCLUDE_FILE "${ctest_include_file}"
+      )
+    else()
+      message(FATAL_ERROR "Cannot set more than one TEST_INCLUDE_FILE")
+    endif()
+  endif()
+
+endfunction()
+
+###############################################################################
+
+set(_CATCH_DISCOVER_TESTS_SCRIPT
+  ${CMAKE_CURRENT_LIST_DIR}/CatchAddTests.cmake
+  CACHE INTERNAL "Catch2 full path to CatchAddTests.cmake helper file"
+)
diff --git a/cmake/docppConfig.cmake b/cmake/docppConfig.cmake
new file mode 100644
index 0000000..bcaafdf
--- /dev/null
+++ b/cmake/docppConfig.cmake
@@ -0,0 +1,2 @@
+include(CMakeFindDependencyMacro)
+include(${CMAKE_CURRENT_LIST_DIR}/docppTargets.cmake)
diff --git a/compile_commands.json b/compile_commands.json
new file mode 120000
index 0000000..25eb4b2
--- /dev/null
+++ b/compile_commands.json
@@ -0,0 +1 @@
+build/compile_commands.json
\ No newline at end of file
diff --git a/examples/hello-world.cpp b/examples/hello-world.cpp
new file mode 100644
index 0000000..7844e18
--- /dev/null
+++ b/examples/hello-world.cpp
@@ -0,0 +1,116 @@
+// Compile with: g++ hello-world.cpp -o hello-world -ldocpp
+#include <iostream>
+#include <fstream>
+#include <docpp/docpp.hpp>
+
+int main() {
+    /* This is your root document. It can hold *one* HTML section, and that section can hold any number of elements and/or sections.
+     * By default, the root document will prepend a doctype declaration. If you don't want that (e.g., if you're writing XML), you can
+     * use docpp::HTML::HTMLDocument::setDocType() to set the doctype to your preferred value.
+     *
+     * To get the document as an std::string object, call doc.get().
+     */
+    docpp::HTML::HTMLDocument doc{};
+
+    /* This is an HTML section. It can hold any number of elements and/or sections.
+     * The first argument is the type of section, and this can either be a predefined value (e.g., docpp::HTML::SECTION_HTML) or a
+     * custom value in the form of an std::string object.
+     *
+     * The second argument is an HTMLElementProperties object, which is a collection of HTMLProperty objects. Each property is a std::pair of an
+     * attribute name and an attribute value. If you don't want to specify any attributes, you can pass an empty HTMLElementAttributes object.
+     * If you need to change the tag and/or attributes later, you can use the set() method.
+     *
+     * Note that it is very important that you do not append a section or element to a section until you have finished its construction,
+     * because push_back() makes a copy of the object you pass to it. If you need to make changes later, you can use methods such as find() and swap(),
+     * or construct a new object.
+     *
+     * To get the section as an std::string object, call section.get().
+     */
+    docpp::HTML::HTMLSection htmlSection(docpp::HTML::SECTION_HTML, {}); // <html></html>
+    docpp::HTML::HTMLSection headSection(docpp::HTML::SECTION_HEAD, {}); // <head></head>
+    docpp::HTML::HTMLSection bodySection(docpp::HTML::SECTION_BODY, {}); // <body></body>
+    docpp::HTML::HTMLSection footerSection(docpp::HTML::SECTION_FOOTER, {}); // <footer></footer>
+
+    /* This is an HTML element. Unlike a section, an element cannot hold any other elements or sections, rather it holds text and/or attributes.
+     * The first argument is the type of element, and this should simply be the tag name (e.g., "p", "h1", "a", etc.).
+     *
+     * The second argument is an HTMLElementProperties object, which is a collection of HTMLProperty objects. Each property is a std::pair of an
+     * attribute name and an attribute value. If you don't want to specify any attributes, you can pass an empty HTMLElementAttributes object.
+     * If you need to change the element's tag, attributes, type or text later, you can use the set() method.
+     *
+     * The third argument is the text content of the element. If you don't want to specify any text, you can pass an empty std::string object.
+     *
+     * The fourth argument is an integer representing the closing tag type. This can be one of the following:
+     *
+     * - docpp::HTML::TYPE_NON_CLOSED: No closing tag will be appended.
+     *   Example: <img src="example.jpg">
+     * - docpp::HTML::TYPE_NON_SELF_CLOSING: A closing tag will be appended.
+     *   Example: <p>Hello world</p>
+     * - docpp::HTML::TYPE_SELF_CLOSING: A self-closing tag will be appended.
+     *   Example: <img src="example.jpg">
+     *
+     *  To get the element as an std::string object, call element.get().
+     */
+    docpp::HTML::HTMLElement titleElement("title", {}, "Hello world document"); // <title>Hello world document</title>
+
+    /* Add the title and meta elements to the head section. */
+    headSection.push_back(titleElement);
+    headSection.push_back(docpp::HTML::HTMLElement("meta", {{docpp::HTML::HTMLProperty("name", "description"), docpp::HTML::HTMLProperty("content", "Hello world document description!")}}, "", docpp::HTML::TYPE_NON_CLOSED));
+
+    /* This is a CSS document. It is essentially the CSS equivalent of an HTML section.
+     * It is essentially a collection of CSSElement objects, which is a collection of CSSProperty objects.
+     *
+     * In other words, a CSS document is a collection of CSS elements, which are collections of CSS properties.
+     */
+    docpp::CSS::CSSStylesheet stylesheet{};
+
+    /* This is a CSS element. It is essentially a collection of CSS properties.
+     * The first argument is the type of element, and this should simply be the tag name (e.g., "body", "p", "h1", etc.).
+     *
+     * The second argument is a CSSProperties object, which is a collection of CSSProperty objects. Each property is a std::pair of a
+     * property name and a property value. If you don't want to specify any properties, you can pass an empty CSSProperties object, but... of course, that's not very useful.
+     *
+     * To get the element as an std::string object, call element.get().
+     */
+    docpp::CSS::CSSElement bodyStyling("body", {{docpp::CSS::CSSProperty("background-color", "black"), docpp::CSS::CSSProperty("color", "white")}}); // body { background-color: black; color: white; }
+
+    /* Now, let's add the body style to the stylesheet. */
+    stylesheet.push_back(bodyStyling);
+
+    /* To get the stylesheet as an std::string object, call stylesheet.get(). It can then be used in an HTMLElement object. */
+    const std::string& css = stylesheet.get(); // body { background-color: black; color: white; }
+
+    headSection.push_back(docpp::HTML::HTMLElement("style", {}, css)); // <style>body { background-color: black; color: white; }</style>
+
+    /* Add a paragraph element to the body section. */
+    bodySection.push_back(docpp::HTML::HTMLElement("p", {}, "Hello, world!")); // <p>Hello, world!</p>
+
+    /* Likewise, add a paragraph element to the footer section. */
+    footerSection.push_back(docpp::HTML::HTMLElement("p", {}, "This is the footer.")); // <p>This is the footer.</p>
+
+    /* Now, let's add the header, body and footer section to the html section.
+     * The order does matter, because an identifier is used internally. You can get this identifier by e.g. using find().
+     */
+    htmlSection.push_back(headSection); // <html><head>...</head></html>
+    htmlSection.push_back(bodySection); // <html><head>...</head><body>...</body></html>
+    htmlSection.push_back(footerSection); // <html><head>...</head><body>...</body><footer>...</footer></html>
+
+    /* Now, let's add the html section to the document. */
+    doc.set(htmlSection);
+
+    /* Finally, let's output the document to a file and print it to standard output. */
+    std::ofstream file("hello-world.html");
+
+    /* Optionally, you can use the get() method with the docpp::HTML::FORMATTING_PRETTY argument to get a *slightly* more readable document.
+     * It still doesn't look hand-made, but it's readable at least. The same goes for the CSS document.
+     */
+    file << doc.get(docpp::HTML::FORMATTING_PRETTY);
+
+    file.close();
+
+    std::cout << doc.get() << "\n";
+
+    /* And we're done! */
+    return 0;
+
+}
diff --git a/include/docpp.hpp b/include/docpp.hpp
new file mode 100644
index 0000000..6150885
--- /dev/null
+++ b/include/docpp.hpp
@@ -0,0 +1,556 @@
+/**
+ * docpp - Small C++ library for generating XML, HTML and CSS.
+ * Licensed under the LGPL-3.0-or-later license.
+ *
+ * Author: speedie <speedie@speedie.site>
+ *
+ * @file docpp.hpp
+ * @brief Header file for docpp
+ * @author speedie
+ * @date 2024
+ * @copyright GNU Lesser General Public License 3.0
+ * @version 0.0.1
+ */
+#pragma once
+
+#include <string>
+#include <vector>
+#include <unordered_map>
+
+/**
+ * @brief A namespace to represent HTML elements and documents
+ */
+namespace docpp {
+    namespace HTML {
+        enum {
+            SECTION_HTML,
+            SECTION_HEAD,
+            SECTION_BODY,
+            SECTION_FOOTER,
+            SECTION_DIV,
+            TYPE_SELF_CLOSING,
+            TYPE_NON_SELF_CLOSING,
+            TYPE_NON_CLOSED,
+            FORMATTING_NONE,
+            FORMATTING_PRETTY,
+        };
+
+        /**
+         * @brief A class to represent an HTML property
+         */
+        class HTMLProperty {
+            private:
+                std::pair<std::string, std::string> property{};
+            protected:
+            public:
+                /**
+                 * @brief Construct a new HTMLProperty object
+                 * @param key The key of the property
+                 * @param value The value of the property
+                 */
+                HTMLProperty(const std::string& key, const std::string& value);
+                /**
+                 * @brief Construct a new HTMLProperty object
+                 * @param property The property to set
+                 */
+                HTMLProperty(const std::pair<std::string, std::string>& property);
+                HTMLProperty() = default;
+
+                /**
+                 * @brief Get the key of the property
+                 * @return std::string The key of the property
+                 */
+                std::string getKey() const;
+                /**
+                 * @brief Get the value of the property
+                 * @return std::string The value of the property
+                 */
+                std::string getValue() const;
+                /**
+                 * @brief Get the property.
+                 * @return std::pair<std::string, std::string> The value of the property
+                 */
+                std::pair<std::string, std::string> get() const;
+                /**
+                 * @brief Set the key of the property.
+                 * @param key The key.
+                 */
+                void setKey(const std::string& key);
+                /**
+                 * @brief Set the value of the property.
+                 * @param value The value.
+                 */
+                void setValue(const std::string& value);
+                /**
+                 * @brief Set the property
+                 * @param property The property.
+                 */
+                void set(const std::pair<std::string, std::string>& property);
+        };
+
+        /**
+         * @brief A class to represent the properties of an HTML element
+         */
+        class HTMLElementProperties {
+            private:
+                std::vector<HTMLProperty> properties{};
+            protected:
+            public:
+                /**
+                 * @brief Get the properties of the element
+                 * @return std::vector<HTMLProperty> The properties of the element
+                 */
+                std::vector<HTMLProperty> get() const;
+                /**
+                 * @brief Set the properties of the element
+                 * @param properties The properties to set
+                 */
+                void set(const std::vector<HTMLProperty>& properties);
+                /**
+                 * @brief Add a property to the element
+                 * @param property The property to add
+                 */
+                void push_back(const HTMLProperty& property);
+                /**
+                 * @brief Construct a new HTMLElementProperties object
+                 * @param properties The properties to set
+                 */
+                HTMLElementProperties(const std::vector<HTMLProperty>& properties);
+                /**
+                 * @brief Construct a new HTMLElementProperties object
+                 * @param property The property to add
+                 */
+                HTMLElementProperties(const HTMLProperty& property);
+                /**
+                 * @brief Construct a new HTMLElementProperties object
+                 */
+                HTMLElementProperties() = default;
+        };
+
+        /**
+         * @brief A class to represent an HTML element
+         */
+        class HTMLElement {
+            private:
+                std::string tag{};
+                std::string data{};
+                int type{TYPE_NON_SELF_CLOSING};
+                HTMLElementProperties properties{};
+            protected:
+            public:
+                /**
+                 * @brief Construct a new HTMLElement object
+                 * @param tag The tag of the element
+                 * @param properties The properties of the element
+                 * @param data The data of the element
+                 */
+                HTMLElement(const std::string& tag, const HTMLElementProperties& properties = {}, const std::string& data = {}, const int type = TYPE_NON_SELF_CLOSING);
+                /**
+                 * @brief Construct a new HTMLElement object
+                 */
+                HTMLElement() = default;
+                /**
+                 * @brief Set the tag, id, and classes of the element
+                 * @param tag The tag of the element
+                 * @param id The id of the element
+                 * @param classes The classes of the element
+                 */
+                void set(const std::string& tag, const HTMLElementProperties& properties = {}, const std::string& data = {}, const int type = TYPE_NON_SELF_CLOSING);
+
+                /**
+                 * @brief Get the element in the form of an HTML tag.
+                 * @return std::string The tag of the element
+                 */
+                std::string get(const int formatting = FORMATTING_NONE) const;
+
+                /**
+                 * @brief Get the tag of the element
+                 * @return std::string The data of the element
+                 */
+                std::string getTag() const;
+
+                /**
+                 * @brief Get the data of the element
+                 * @return std::string The data of the element
+                 */
+                std::string getData() const;
+        };
+
+        /**
+         * @brief A class to represent an HTML section (head, body, etc.)
+         */
+        class HTMLSection {
+            private:
+                int index{};
+                std::string tag{};
+                HTMLElementProperties properties{};
+
+                std::unordered_map<int, HTMLElement> elements{};
+                std::unordered_map<int, HTMLSection> sections{};
+            protected:
+            public:
+                /**
+                 * @brief Prepend an element to the section
+                 * @param element The element to add
+                 */
+                void push_front(const HTMLElement& element);
+                /**
+                 * @brief Prepend a section to the section
+                 * @param section The section to add
+                 */
+                void push_front(const HTMLSection& section);
+                /**
+                 * @brief Append an element to the section
+                 * @param element The element to add
+                 */
+                void push_back(const HTMLElement& element);
+                /**
+                 * @brief Append a section to the section
+                 * @param section The section to add
+                 */
+                void push_back(const HTMLSection& section);
+                /**
+                 * @brief Erase an element from the section. Note that this will NOT change the size/index.
+                 * @param index The index of the element to erase
+                 */
+                void erase(const int index);
+                /**
+                 * @brief Erase a section from the section, by reading from a section. The section will be erased if it's identical to section. Note that this will NOT change the size/index.
+                 * @param section The section to erase
+                 */
+                void erase(const HTMLSection& section);
+                /**
+                 * @brief Erase an element from the section, by reading from an element. The element will be erased if it's identical to element. Note that this will NOT change the size/index.
+                 * @param element The element to erase
+                 */
+                void erase(const HTMLElement& element);
+                /**
+                 * @brief Find an element in the section
+                 * @param element The element to find
+                 * @return int The index of the element
+                 */
+                int find(const HTMLElement& element);
+                /**
+                 * @brief Find a section in the section
+                 * @param section The section to find
+                 * @return int The index of the section
+                 */
+                int find(const HTMLSection& section);
+                /**
+                 * @brief Insert an element into the section
+                 * @param index The index to insert the element
+                 * @param element The element to insert
+                 */
+                void insert(const int index, const HTMLElement& element);
+                /**
+                 * @brief Insert a section into the section
+                 * @param index The index to insert the section
+                 * @param section The section to insert
+                 */
+                void insert(const int index, const HTMLSection& section);
+                /**
+                 * @brief Get the size of the section
+                 * @return int The size of the section
+                 */
+                int size() const;
+
+                /**
+                 * @brief Construct a new HTMLSection object
+                 * @param tag The tag of the section
+                 * @param properties The properties of the section
+                 */
+                HTMLSection(const std::string& tag, const HTMLElementProperties& properties = {});
+                /**
+                 * @brief Construct a new HTMLSection object
+                 * @param tag The tag of the section
+                 * @param properties The properties of the section
+                 */
+                HTMLSection(const int tag, const HTMLElementProperties& properties = {});
+                /**
+                 * @brief Construct a new HTMLSection object
+                 */
+                HTMLSection() = default;
+                /**
+                 * @brief Set the tag, id, and classes of the section
+                 * @param tag The tag of the section
+                 * @param id The id of the section
+                 * @param classes The classes of the section
+                 */
+                void set(const std::string& tag, const HTMLElementProperties& properties = {});
+                /**
+                 * @brief Set the tag, id, and classes of the section
+                 * @param tag The tag of the section
+                 * @param id The id of the section
+                 * @param classes The classes of the section
+                 */
+                void set(const int tag, const HTMLElementProperties& properties = {});
+                /**
+                 * @brief Swap two elements in the section
+                 * @param index1 The index of the first element
+                 * @param index2 The index of the second element
+                 */
+                void swap(const int index1, const int index2);
+                /**
+                 * @brief Swap two elements in the section
+                 * @param element1 The first element
+                 * @param element2 The second element
+                 */
+                void swap(const HTMLElement& element1, const HTMLElement& element2);
+                /**
+                 * @brief Swap two sections in the section
+                 * @param index1 The index of the first section
+                 * @param index2 The index of the second section
+                 */
+                void swap(const HTMLSection& section1, const HTMLSection& section2);
+                /**
+                 * @brief Get the elements of the section
+                 * @return std::vector<HTMLElement> The elements of the section
+                 */
+                std::vector<HTMLElement> getHTMLElements();
+                /**
+                 * @brief Get the sections of the section
+                 * @return std::vector<HTMLSection> The sections of the section
+                 */
+                std::vector<HTMLSection> getHTMLSections();
+
+                /**
+                 * @brief Dump the entire section.
+                 * @return std::string The section
+                 */
+                std::string get(const int formatting = FORMATTING_NONE) const;
+
+        };
+
+        /**
+         * @brief A class to represent an HTML document
+         */
+        class HTMLDocument {
+            private:
+                std::string doctype{"<!DOCTYPE html>"};
+                HTMLSection document{};
+            protected:
+            public:
+                /**
+                 * @brief Get the document
+                 * @param std::string The type to return
+                 * @return std::string The document
+                 */
+                std::string get(const int formatting = FORMATTING_NONE) const;
+
+                /**
+                 * @brief Get the doctype of the document
+                 * @return std::string The doctype of the document
+                 */
+                std::string getDoctype() const;
+
+                /**
+                 * @brief Set the document
+                 * @param document The document to set
+                 */
+                void set(const HTMLSection& document);
+                /**
+                 * @brief Set the doctype of the document
+                 * @param doctype The doctype to set
+                 */
+                void setDoctype(const std::string& doctype);
+                /**
+                 * @brief Construct a new HTMLDocument object
+                 */
+                HTMLDocument() = default;
+                /**
+                 * @brief Construct a new HTMLDocument object
+                 * @param document The document to set
+                 */
+                HTMLDocument(const HTMLSection& document, const std::string& doctype = "<!DOCTYPE html>");
+        };
+    } // namespace HTML
+
+    namespace CSS {
+        enum {
+            FORMATTING_NONE,
+            FORMATTING_PRETTY,
+        };
+
+        class CSSProperty {
+            private:
+                std::pair<std::string, std::string> property{};
+            protected:
+            public:
+                /**
+                 * @brief Construct a new CSSProperty object
+                 * @param key The key of the property
+                 * @param value The value of the property
+                 */
+                CSSProperty(const std::string& key, const std::string& value);
+                /**
+                 * @brief Construct a new CSSProperty object
+                 * @param property The property to set
+                 */
+                CSSProperty(const std::pair<std::string, std::string>& property);
+                CSSProperty() = default;
+
+                /**
+                 * @brief Get the key of the property
+                 * @return std::string The key of the property
+                 */
+                std::string getKey() const;
+                /**
+                 * @brief Get the value of the property
+                 * @return std::string The value of the property
+                 */
+                std::string getValue() const;
+                /**
+                 * @brief Get the property.
+                 * @return std::pair<std::string, std::string> The value of the property
+                 */
+                std::pair<std::string, std::string> get() const;
+                /**
+                 * @brief Set the key of the property.
+                 * @param key The key.
+                 */
+                void setKey(const std::string& key);
+                /**
+                 * @brief Set the value of the property.
+                 * @param value The value.
+                 */
+                void setValue(const std::string& value);
+                /**
+                 * @brief Set the property
+                 * @param property The property.
+                 */
+                void set(const std::pair<std::string, std::string>& property);
+                /**
+                 * @brief Set the property
+                 * @param key The key of the property
+                 * @param value The value of the property
+                 */
+                void set(const std::string& key, const std::string& value);
+        };
+
+        class CSSElement {
+            private:
+                std::pair<std::string, std::vector<CSSProperty>> element{};
+            protected:
+            public:
+                /**
+                 * @brief Construct a new CSSElement object
+                 * @param tag The tag of the element
+                 * @param properties The properties of the element
+                 */
+                CSSElement(const std::string& tag, const std::vector<CSSProperty>& properties);
+                /**
+                 * @brief Construct a new CSSElement object
+                 * @param element The element to set
+                 */
+                CSSElement(const std::pair<std::string, std::vector<CSSProperty>>& element);
+                CSSElement() = default;
+
+                /**
+                 * @brief Push a property to the element
+                 * @param property The property to push
+                 */
+                void push_back(const CSSProperty& property);
+                /**
+                 * @brief Set the properties of the element
+                 * @param properties The properties to set
+                 */
+                void set(const std::string& tag, const std::vector<CSSProperty>& properties);
+                /**
+                 * @brief Set the properties of the element
+                 * @param element The element to set
+                 */
+                void set(const std::pair<std::string, std::vector<CSSProperty>>& element);
+                /**
+                 * @brief Get the element
+                 * @return std::pair<std::string, std::vector<CSSProperty>> The element
+                 */
+                std::string get(const int formatting = FORMATTING_NONE) const;
+                /**
+                 * @brief Get the tag of the element
+                 * @return std::string The tag of the element
+                 */
+                std::string getTag() const;
+                /**
+                 * @brief Get the properties of the element
+                 * @return std::vector<CSSProperty> The properties of the element
+                 */
+                std::vector<CSSProperty> getProperties() const;
+        };
+
+        /**
+         * @brief A class to represent a CSS stylesheet
+         */
+        class CSSStylesheet {
+            private:
+                std::vector<CSSElement> elements{};
+            protected:
+            public:
+                /**
+                 * @brief Construct a new CSSStylesheet object
+                 * @param elements The elements to set
+                 */
+                CSSStylesheet(const std::vector<CSSElement>& elements);
+                CSSStylesheet() = default;
+
+                /**
+                 * @brief Prepend an element to the stylesheet
+                 * @param element The element to add
+                 */
+                void push_front(const CSSElement& element);
+                /**
+                 * @brief Append an element to the stylesheet
+                 * @param element The element to add
+                 */
+                void push_back(const CSSElement& element);
+                /**
+                 * @brief Insert an element into the stylesheet
+                 * @param index The index to insert the element
+                 * @param element The element to insert
+                 */
+                void insert(const int index, const CSSElement& element);
+                /**
+                 * @brief Erase an element from the stylesheet. Note that this will NOT change the size/index.
+                 * @param index The index of the element to erase
+                 */
+                void erase(const int index);
+                /**
+                 * @brief Find an element in the stylesheet
+                 * @param element The element to find
+                 * @return int The index of the element
+                 */
+                int find(const CSSElement& element);
+                /**
+                 * @brief Get the size of the stylesheet
+                 * @return int The size of the stylesheet
+                 */
+                int size() const;
+                /**
+                 * @brief Swap two elements in the stylesheet
+                 * @param index1 The index of the first element
+                 * @param index2 The index of the second element
+                 */
+                void swap(const int index1, const int index2);
+                /**
+                 * @brief Swap two elements in the stylesheet
+                 * @param element1 The first element
+                 * @param element2 The second element
+                 */
+                void swap(const CSSElement& element1, const CSSElement& element2);
+                /**
+                 * @brief Set the elements of the stylesheet
+                 * @param elements The elements to set
+                 */
+                void set(const std::vector<CSSElement>& elements);
+                /**
+                 * @brief Get the elements of the stylesheet
+                 * @return std::vector<CSSElement> The elements of the stylesheet
+                 */
+                std::vector<CSSElement> getElements() const;
+                /**
+                 * @brief Get the stylesheet
+                 * @return std::string The stylesheet
+                 */
+                std::string get(const int formatting = FORMATTING_NONE) const;
+        };
+    }
+}
diff --git a/src/docpp.cpp b/src/docpp.cpp
new file mode 100644
index 0000000..452e1a4
--- /dev/null
+++ b/src/docpp.cpp
@@ -0,0 +1,538 @@
+/**
+ * docpp - Small C++ library for generating XML, HTML and CSS.
+ * Licensed under the LGPL-3.0-or-later license.
+ *
+ * Author: speedie <speedie@speedie.site>
+ *
+ * @file docpp.cpp
+ * @brief Implementation of the docpp library.
+ * @author speedie
+ * @date 2024
+ * @copyright GNU Lesser General Public License 3.0.
+ * @version 0.0.1
+ */
+
+#include <include/docpp.hpp>
+#include <string>
+#include <vector>
+#include <unordered_map>
+#include <stdexcept>
+
+docpp::HTML::HTMLProperty::HTMLProperty(const std::string& key, const std::string& value) {
+    this->setKey(key);
+    this->setValue(value);
+}
+
+docpp::HTML::HTMLProperty::HTMLProperty(const std::pair<std::string, std::string>& property) {
+    this->set(property);
+}
+
+std::string docpp::HTML::HTMLProperty::getKey() const {
+    return this->property.first;
+}
+
+std::string docpp::HTML::HTMLProperty::getValue() const {
+    return this->property.second;
+}
+
+std::pair<std::string, std::string> docpp::HTML::HTMLProperty::get() const {
+    return this->property;
+}
+
+void docpp::HTML::HTMLProperty::setKey(const std::string& key) {
+    this->property.first = key;
+}
+
+void docpp::HTML::HTMLProperty::setValue(const std::string& value) {
+    this->property.second = value;
+}
+
+void docpp::HTML::HTMLProperty::set(const std::pair<std::string, std::string>& property) {
+    this->property = property;
+}
+
+docpp::HTML::HTMLElementProperties::HTMLElementProperties(const std::vector<docpp::HTML::HTMLProperty>& properties) {
+    this->set(properties);
+}
+
+docpp::HTML::HTMLElementProperties::HTMLElementProperties(const docpp::HTML::HTMLProperty& property) {
+    this->push_back(property);
+}
+
+std::vector<docpp::HTML::HTMLProperty> docpp::HTML::HTMLElementProperties::get() const {
+    return this->properties;
+}
+
+void docpp::HTML::HTMLElementProperties::set(const std::vector<docpp::HTML::HTMLProperty>& properties) {
+    this->properties = properties;
+}
+
+void docpp::HTML::HTMLElementProperties::push_back(const docpp::HTML::HTMLProperty& property) {
+    this->properties.push_back(property);
+}
+
+docpp::HTML::HTMLElement::HTMLElement(const std::string& tag, const HTMLElementProperties& properties, const std::string& data, const int type) {
+    this->set(tag, properties, data, type);
+}
+
+void docpp::HTML::HTMLElement::set(const std::string& tag, const HTMLElementProperties& properties, const std::string& data, const int type) {
+    this->tag = tag;
+    this->data = data;
+    this->properties = properties;
+    this->type = type;
+}
+
+std::string docpp::HTML::HTMLElement::get(const int formatting) const {
+    std::string ret{};
+
+    ret += "<" + this->tag;
+
+    for (const auto& it : this->properties.get()) {
+        if (!it.getKey().compare("")) continue;
+        if (!it.getValue().compare("")) continue;
+
+        ret += " " + it.getKey() + "=\"" + it.getValue() + "\"";
+    }
+
+    if (this->type != docpp::HTML::TYPE_SELF_CLOSING) {
+        ret += ">";
+    }
+
+    if (this->type == docpp::HTML::TYPE_NON_SELF_CLOSING) {
+        ret += this->data + "</" + this->tag + ">";
+    } else if (this->type == docpp::HTML::TYPE_SELF_CLOSING) {
+        ret += this->data + "/>";
+    }
+
+    if (formatting == docpp::HTML::FORMATTING_PRETTY) {
+        ret += "\n";
+    }
+
+    return std::move(ret);
+}
+
+std::string docpp::HTML::HTMLElement::getTag() const {
+    return this->tag;
+}
+
+std::string docpp::HTML::HTMLElement::getData() const {
+    return this->data;
+}
+
+docpp::HTML::HTMLSection::HTMLSection(const std::string& tag, const HTMLElementProperties& properties) {
+    this->tag = tag;
+    this->properties = properties;
+}
+
+docpp::HTML::HTMLSection::HTMLSection(const int tag, const HTMLElementProperties& properties) {
+    if (tag == docpp::HTML::SECTION_DIV) {
+        this->tag = "div";
+    } else if (tag == docpp::HTML::SECTION_BODY) {
+        this->tag = "body";
+    } else if (tag == docpp::HTML::SECTION_FOOTER) {
+        this->tag = "footer";
+    } else if (tag == docpp::HTML::SECTION_HEAD) {
+        this->tag = "head";
+    } else if (tag == docpp::HTML::SECTION_HTML) {
+        this->tag = "html";
+    }
+
+    this->properties = properties;
+}
+
+void docpp::HTML::HTMLSection::set(const std::string& tag, const HTMLElementProperties& properties) {
+    this->tag = tag;
+    this->properties = properties;
+}
+
+void docpp::HTML::HTMLSection::set(const int tag, const HTMLElementProperties& properties) {
+    if (tag == docpp::HTML::SECTION_DIV) {
+        this->tag = "div";
+    } else if (tag == docpp::HTML::SECTION_BODY) {
+        this->tag = "body";
+    } else if (tag == docpp::HTML::SECTION_FOOTER) {
+        this->tag = "footer";
+    } else if (tag == docpp::HTML::SECTION_HEAD) {
+        this->tag = "head";
+    } else if (tag == docpp::HTML::SECTION_HTML) {
+        this->tag = "html";
+    }
+
+    this->properties = properties;
+}
+
+void docpp::HTML::HTMLSection::push_front(const HTMLElement& element) {
+    for (int i{this->index}; i > 0; i--) {
+        this->elements[i] = this->elements.at(i - 1);
+    }
+
+    this->elements[0] = element;
+    this->index++;
+}
+
+void docpp::HTML::HTMLSection::push_front(const HTMLSection& section) {
+    for (int i{this->index}; i > 0; i--) {
+        this->sections.at(i) = this->sections.at(i - 1);
+    }
+
+    this->sections[0] = section;
+    this->index++;
+}
+
+void docpp::HTML::HTMLSection::push_back(const HTMLElement& element) {
+    this->elements[this->index++] = element;
+}
+
+void docpp::HTML::HTMLSection::push_back(const HTMLSection& section) {
+    this->sections[this->index++] = section;
+}
+
+void docpp::HTML::HTMLSection::erase(const int index) {
+    bool erased{false};
+    if (this->elements.find(index) != this->elements.end()) {
+        this->elements.erase(index);
+        erased = true;
+    } else if (this->sections.find(index) != this->sections.end()) {
+        this->sections.erase(index);
+        erased = true;
+    }
+
+    if (!erased) {
+        throw std::out_of_range("Index out of range");
+    }
+}
+
+void docpp::HTML::HTMLSection::erase(const HTMLSection& section) {
+    for (int i{0}; i < this->size(); i++) {
+        const auto it = this->getHTMLSections().at(i);
+
+        if (it.get() == section.get()) {
+            this->erase(i);
+            return;
+        }
+    }
+
+    throw std::out_of_range("Section not found");
+}
+
+void docpp::HTML::HTMLSection::erase(const HTMLElement& element) {
+    for (int i{0}; i < this->size(); i++) {
+        const auto it = this->getHTMLElements().at(i);
+
+        if (it.get() == element.get()) {
+            this->erase(i);
+            return;
+        }
+    }
+
+    throw std::out_of_range("Element not found");
+}
+
+void docpp::HTML::HTMLSection::insert(const int index, const HTMLElement& element) {
+    if (this->sections.find(index) != this->sections.end()) {
+        throw std::invalid_argument("Index already occupied by a section");
+    } else {
+        this->elements[index] = element;
+    }
+
+    this->index = std::max(this->index, index) + 1;
+}
+
+void docpp::HTML::HTMLSection::insert(const int index, const HTMLSection& section) {
+    this->sections[index] = section;
+    this->index = std::max(this->index, index) + 1;
+}
+
+int docpp::HTML::HTMLSection::find(const HTMLElement& element) {
+    for (int i{0}; i < this->size(); i++) {
+        const auto it = this->getHTMLElements().at(i);
+
+        if (it.get() == element.get()) {
+            return i;
+        }
+    }
+
+    throw std::out_of_range("Element not found");
+}
+
+int docpp::HTML::HTMLSection::find(const HTMLSection& section) {
+    for (int i{0}; i < this->size(); i++) {
+        const auto it = this->getHTMLSections().at(i);
+
+        if (it.get() == section.get()) {
+            return i;
+        }
+    }
+
+    throw std::out_of_range("Section not found");
+}
+
+int docpp::HTML::HTMLSection::size() const {
+    return this->index;
+}
+
+std::vector<docpp::HTML::HTMLElement> docpp::HTML::HTMLSection::getHTMLElements() {
+    std::vector<docpp::HTML::HTMLElement> ret{};
+    ret.reserve(this->index);
+    for (int i{0}; i < this->index; i++) {
+        if (this->elements.find(i) != this->elements.end()) {
+            ret.push_back(this->elements.at(i));
+        }
+    }
+    return std::move(ret);
+}
+
+std::vector<docpp::HTML::HTMLSection> docpp::HTML::HTMLSection::getHTMLSections() {
+    std::vector<docpp::HTML::HTMLSection> ret{};
+    ret.reserve(this->index);
+
+    for (int i{0}; i < this->index; i++) {
+        if (this->sections.find(i) != this->sections.end()) {
+            ret.push_back(this->sections.at(i));
+        }
+    }
+
+    return std::move(ret);
+}
+
+std::string docpp::HTML::HTMLSection::get(const int formatting) const {
+    std::string ret{};
+
+    ret += "<" + this->tag;
+
+    for (const auto& it : this->properties.get()) {
+        if (!it.getKey().compare("")) continue;
+        if (!it.getValue().compare("")) continue;
+
+        ret += " " + it.getKey() + "=\"" + it.getValue() + "\"";
+    }
+
+    ret += ">";
+
+    if (formatting == docpp::HTML::FORMATTING_PRETTY) {
+        ret += "\n";
+    }
+
+    for (int i{0}; i < this->index; i++) {
+        if (this->elements.find(i) != this->elements.end()) {
+            ret += this->elements.at(i).get(formatting);
+        } else if (this->sections.find(i) != this->sections.end()) {
+            ret += this->sections.at(i).get(formatting);
+
+            if (formatting == docpp::HTML::FORMATTING_PRETTY) {
+                ret += "\n";
+            }
+        }
+    }
+
+    ret += "</" + this->tag + ">";
+
+    return std::move(ret);
+}
+
+void docpp::HTML::HTMLSection::swap(const int index1, const int index2) {
+    if (this->elements.find(index1) != this->elements.end() && this->elements.find(index2) != this->elements.end()) {
+        std::swap(this->elements[index1], this->elements[index2]);
+    } else if (this->sections.find(index1) != this->sections.end() && this->sections.find(index2) != this->sections.end()) {
+        std::swap(this->sections[index1], this->sections[index2]);
+    } else {
+        throw std::out_of_range("Index out of range");
+    }
+}
+
+void docpp::HTML::HTMLSection::swap(const HTMLElement& element1, const HTMLElement& element2) {
+    this->swap(this->find(element1), this->find(element2));
+}
+
+void docpp::HTML::HTMLSection::swap(const HTMLSection& section1, const HTMLSection& section2) {
+    this->swap(this->find(section1), this->find(section2));
+}
+
+std::string docpp::HTML::HTMLDocument::get(const int formatting) const {
+    return this->doctype + (formatting == FORMATTING_PRETTY ? "\n" : "") + this->document.get(formatting);
+}
+
+void docpp::HTML::HTMLDocument::set(const docpp::HTML::HTMLSection& document) {
+    this->document = document;
+}
+
+void docpp::HTML::HTMLDocument::setDoctype(const std::string& doctype) {
+    this->doctype = doctype;
+}
+
+docpp::HTML::HTMLDocument::HTMLDocument(const docpp::HTML::HTMLSection& document, const std::string& doctype) {
+    this->set(document);
+    this->setDoctype(doctype);
+}
+
+std::string docpp::HTML::HTMLDocument::getDoctype() const {
+    return this->doctype;
+}
+
+docpp::CSS::CSSProperty::CSSProperty(const std::string& key, const std::string& value) {
+    this->set(key, value);
+}
+
+docpp::CSS::CSSProperty::CSSProperty(const std::pair<std::string, std::string>& property) {
+    this->set(property);
+}
+
+std::string docpp::CSS::CSSProperty::getKey() const {
+    return this->property.first;
+}
+
+std::string docpp::CSS::CSSProperty::getValue() const {
+    return this->property.second;
+}
+
+std::pair<std::string, std::string> docpp::CSS::CSSProperty::get() const {
+    return this->property;
+}
+
+void docpp::CSS::CSSProperty::setKey(const std::string& key) {
+    this->property.first = key;
+}
+
+void docpp::CSS::CSSProperty::setValue(const std::string& value) {
+    this->property.second = value;
+}
+
+void docpp::CSS::CSSProperty::set(const std::pair<std::string, std::string>& property) {
+    this->property = property;
+}
+
+void docpp::CSS::CSSProperty::set(const std::string& key, const std::string& value) {
+    this->property = std::make_pair(key, value);
+}
+
+docpp::CSS::CSSElement::CSSElement(const std::string& tag, const std::vector<CSSProperty>& properties) {
+    this->set(tag, properties);
+}
+
+docpp::CSS::CSSElement::CSSElement(const std::pair<std::string, std::vector<CSSProperty>>& element) {
+    this->set(element);
+}
+
+void docpp::CSS::CSSElement::set(const std::string& tag, const std::vector<CSSProperty>& properties) {
+    this->element.first = tag;
+    this->element.second = properties;
+}
+
+void docpp::CSS::CSSElement::set(const std::pair<std::string, std::vector<CSSProperty>>& element) {
+    this->element = element;
+}
+
+void docpp::CSS::CSSElement::push_back(const CSSProperty& property) {
+    this->element.second.push_back(property);
+}
+
+std::string docpp::CSS::CSSElement::get(const int formatting) const {
+    std::string ret{};
+
+    if (this->element.first.compare("")) {
+        ret += this->element.first + " {";
+
+        if (formatting == docpp::CSS::FORMATTING_PRETTY) {
+            ret += "\n";
+        }
+
+        for (const auto& it : this->element.second) {
+            if (!it.getKey().compare("")) continue;
+            if (!it.getValue().compare("")) continue;
+
+            ret += it.getKey() + ": " + it.getValue() + ";";
+
+            if (formatting == docpp::CSS::FORMATTING_PRETTY) {
+                ret += "\n";
+            }
+        }
+
+        ret += "}";
+
+        if (formatting == docpp::CSS::FORMATTING_PRETTY) {
+            ret += "\n";
+        }
+    }
+
+    return std::move(ret);
+}
+
+std::string docpp::CSS::CSSElement::getTag() const {
+    return this->element.first;
+}
+
+std::vector<docpp::CSS::CSSProperty> docpp::CSS::CSSElement::getProperties() const {
+    return this->element.second;
+}
+
+docpp::CSS::CSSStylesheet::CSSStylesheet(const std::vector<CSSElement>& elements) {
+    this->set(elements);
+}
+
+void docpp::CSS::CSSStylesheet::set(const std::vector<CSSElement>& elements) {
+    this->elements = elements;
+}
+
+void docpp::CSS::CSSStylesheet::push_front(const CSSElement& element) {
+    this->elements.insert(this->elements.begin(), element);
+}
+
+void docpp::CSS::CSSStylesheet::push_back(const CSSElement& element) {
+    this->elements.push_back(element);
+}
+
+void docpp::CSS::CSSStylesheet::insert(const int index, const CSSElement& element) {
+    if (index < 0 || index >= this->elements.size()) {
+        throw std::out_of_range("Index out of range");
+    }
+
+    this->elements.insert(this->elements.begin() + index, element);
+}
+
+void docpp::CSS::CSSStylesheet::erase(const int index) {
+    if (index < 0 || index >= this->elements.size()) {
+        throw std::out_of_range("Index out of range");
+    }
+
+    this->elements.erase(this->elements.begin() + index);
+}
+
+int docpp::CSS::CSSStylesheet::find(const CSSElement& element) {
+    for (int i{0}; i < this->elements.size(); i++) {
+        if (this->elements.at(i).get() == element.get()) {
+            return i;
+        }
+    }
+
+    throw std::out_of_range("Element not found");
+}
+
+int docpp::CSS::CSSStylesheet::size() const {
+    return this->elements.size();
+}
+
+void docpp::CSS::CSSStylesheet::swap(const int index1, const int index2) {
+    if (index1 < 0 || index1 >= this->elements.size() || index2 < 0 || index2 >= this->elements.size()) {
+        throw std::out_of_range("Index out of range");
+    }
+
+    std::swap(this->elements[index1], this->elements[index2]);
+}
+
+void docpp::CSS::CSSStylesheet::swap(const CSSElement& element1, const CSSElement& element2) {
+    this->swap(this->find(element1), this->find(element2));
+}
+
+std::vector<docpp::CSS::CSSElement> docpp::CSS::CSSStylesheet::getElements() const {
+    return this->elements;
+}
+
+std::string docpp::CSS::CSSStylesheet::get(const int formatting) const {
+    std::string ret{};
+
+    for (const auto& it : this->elements) {
+        ret += it.get(formatting);
+    }
+
+    return std::move(ret);
+}
diff --git a/tests/test.cpp b/tests/test.cpp
new file mode 100644
index 0000000..826d5ac
--- /dev/null
+++ b/tests/test.cpp
@@ -0,0 +1,200 @@
+#include <string>
+#include <include/docpp.hpp>
+#include <src/docpp.cpp>
+#include <catch2/catch_test_macros.hpp>
+
+/**
+ * @brief Test cases for the DuvaHTML namespace.
+ */
+SCENARIO("Test HTML", "[HTML]") {
+    auto test1 = []() {
+        docpp::HTML::HTMLDocument doc{};
+        docpp::HTML::HTMLSection html(docpp::HTML::SECTION_HTML, {});
+
+        docpp::HTML::HTMLSection head(docpp::HTML::SECTION_HEAD, {});
+        docpp::HTML::HTMLSection body(docpp::HTML::SECTION_BODY, {});
+        docpp::HTML::HTMLSection div(docpp::HTML::SECTION_DIV, {});
+        docpp::HTML::HTMLSection footer(docpp::HTML::SECTION_FOOTER, {});
+
+        head.push_back(docpp::HTML::HTMLElement("title", {}, "Test Title"));
+        body.push_back(docpp::HTML::HTMLElement("h1", {}, "Test Header"));
+        body.push_back(docpp::HTML::HTMLElement("p", {}, "Test Paragraph"));
+
+        docpp::HTML::HTMLElementProperties prop{};
+        prop.push_back(docpp::HTML::HTMLProperty(std::pair<std::string, std::string>("id", "test_id")));
+
+        body.push_back(docpp::HTML::HTMLElement("p", prop, "Test Paragraph With ID"));
+
+        div.push_back(docpp::HTML::HTMLElement("p", {}, "Test Paragraph In Div"));
+        body.push_back(div);
+
+        prop.push_back(docpp::HTML::HTMLProperty(std::pair<std::string, std::string>("class", "class1 class2 class3")));
+
+        body.push_back(docpp::HTML::HTMLElement("p", prop, "Test Paragraph With ID And Class"));
+
+        html.push_back(head);
+        html.push_back(body);
+        html.push_back(footer);
+
+        doc.set(html);
+
+        const std::string expected_html{"<!DOCTYPE html><html><head><title>Test Title</title></head><body><h1>Test Header</h1><p>Test Paragraph</p><p id=\"test_id\">Test Paragraph With ID</p><div><p>Test Paragraph In Div</p></div><p id=\"test_id\" class=\"class1 class2 class3\">Test Paragraph With ID And Class</p></body><footer></footer></html>"};
+
+        REQUIRE(doc.get() == expected_html);
+        REQUIRE(doc.get(docpp::HTML::FORMATTING_PRETTY) == "<!DOCTYPE html>\n<html>\n<head>\n<title>Test Title</title>\n</head>\n<body>\n<h1>Test Header</h1>\n<p>Test Paragraph</p>\n<p id=\"test_id\">Test Paragraph With ID</p>\n<div>\n<p>Test Paragraph In Div</p>\n</div>\n<p id=\"test_id\" class=\"class1 class2 class3\">Test Paragraph With ID And Class</p>\n</body>\n<footer>\n</footer>\n</html>");
+    };
+
+    auto test2 = []() {
+        docpp::HTML::HTMLSection section(docpp::HTML::SECTION_HTML, {});
+
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 1"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 2"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 3"));
+
+        section.erase(docpp::HTML::HTMLElement("p", {}, "Test 2"));
+
+        REQUIRE(section.get() == "<html><p>Test 1</p><p>Test 3</p></html>");
+        REQUIRE(section.get(docpp::HTML::FORMATTING_PRETTY) == "<html>\n<p>Test 1</p>\n<p>Test 3</p>\n</html>");
+    };
+
+    auto test3 = []() {
+        docpp::HTML::HTMLSection section = docpp::HTML::HTMLSection(docpp::HTML::SECTION_HTML, {});
+
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 1"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 2"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 3"));
+
+        int pos = section.find(docpp::HTML::HTMLElement("p", {}, "Test 2"));
+        section.insert(pos, docpp::HTML::HTMLElement("p", {}, "Test 2.5"));
+
+        REQUIRE(section.get() == "<html><p>Test 1</p><p>Test 2.5</p><p>Test 3</p></html>");
+        REQUIRE(section.get(docpp::HTML::FORMATTING_PRETTY) == "<html>\n<p>Test 1</p>\n<p>Test 2.5</p>\n<p>Test 3</p>\n</html>");
+    };
+
+    auto test4 = []() {
+        docpp::HTML::HTMLSection section = docpp::HTML::HTMLSection(docpp::HTML::SECTION_HTML, {});
+
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 1"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 2"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 3"));
+
+        int pos = section.find(docpp::HTML::HTMLElement("p", {}, "Test 2"));
+
+        section.erase(pos);
+
+        REQUIRE(section.get() == "<html><p>Test 1</p><p>Test 3</p></html>");
+        REQUIRE(section.get(docpp::HTML::FORMATTING_PRETTY) == "<html>\n<p>Test 1</p>\n<p>Test 3</p>\n</html>");
+    };
+
+    auto test5 = []() {
+        docpp::HTML::HTMLSection section = docpp::HTML::HTMLSection(docpp::HTML::SECTION_HTML, {});
+        docpp::HTML::HTMLSection subsection(docpp::HTML::SECTION_DIV, {});
+
+        subsection.push_back(docpp::HTML::HTMLElement("p", {}, "Test 1"));
+
+        docpp::HTML::HTMLSection subsection2(docpp::HTML::SECTION_DIV, {});
+        subsection2.push_back(docpp::HTML::HTMLElement("p", {}, "Test 2"));
+
+        subsection.push_back(subsection2);
+
+        section.push_back(subsection);
+
+        docpp::HTML::HTMLDocument doc{};
+        doc.set(section);
+
+        REQUIRE(doc.get() == "<!DOCTYPE html><html><div><p>Test 1</p><div><p>Test 2</p></div></div></html>");
+        REQUIRE(doc.get(docpp::HTML::FORMATTING_PRETTY) == "<!DOCTYPE html>\n<html>\n<div>\n<p>Test 1</p>\n<div>\n<p>Test 2</p>\n</div>\n</div>\n</html>");
+    };
+
+    auto test6 = []() {
+        docpp::CSS::CSSStylesheet css{};
+        docpp::CSS::CSSElement element{"p", {{"color", "red"}, {"font-size", "16px"}, {"font-family", "Arial"}}};
+
+        css.push_back(element);
+
+        REQUIRE(css.get() == "p {color: red;font-size: 16px;font-family: Arial;}");
+        REQUIRE(css.get(docpp::CSS::FORMATTING_PRETTY) == "p {\ncolor: red;\nfont-size: 16px;\nfont-family: Arial;\n}\n");
+    };
+
+    auto test7 = []() {
+        docpp::CSS::CSSStylesheet css = docpp::CSS::CSSStylesheet{};
+        docpp::CSS::CSSElement element = docpp::CSS::CSSElement{"p", {{"color", "red"}, {"font-size", "16px"}, {"font-family", "Arial"}}};
+        docpp::CSS::CSSElement element2{"div", {{"color", "blue"}, {"font-size", "12px"}, {"font-family", "Arial"}}};
+
+        css.push_back(element);
+        css.push_front(element2);
+
+        REQUIRE(css.get() == "div {color: blue;font-size: 12px;font-family: Arial;}p {color: red;font-size: 16px;font-family: Arial;}");
+    };
+
+    auto test8 = []() {
+        docpp::CSS::CSSStylesheet css = docpp::CSS::CSSStylesheet{};
+        docpp::CSS::CSSElement element = docpp::CSS::CSSElement{"p", {{"color", "red"}, {"font-size", "16px"}, {"font-family", "Arial"}}};
+        docpp::CSS::CSSElement element2{"div", {{"color", "blue"}, {"font-size", "12px"}, {"font-family", "Arial"}}};
+
+        css.push_back(element);
+        css.push_front(element2);
+
+        css.erase(css.find(element2));
+
+        REQUIRE(css.get() == "p {color: red;font-size: 16px;font-family: Arial;}");
+    };
+
+    auto test9 = []() {
+        docpp::CSS::CSSStylesheet css = docpp::CSS::CSSStylesheet{};
+        docpp::CSS::CSSElement element = docpp::CSS::CSSElement{"p", {{"color", "red"}, {"font-size", "16px"}, {"font-family", "Arial"}}};
+        docpp::CSS::CSSElement element2{"div", {{"color", "blue"}, {"font-size", "12px"}, {"font-family", "Arial"}}};
+
+        css.push_back(element);
+        css.push_front(element2);
+
+        css.erase(css.find(element2));
+        css.push_front(element2);
+
+        css.swap(css.find(element), css.find(element2));
+
+        REQUIRE(css.get() == "p {color: red;font-size: 16px;font-family: Arial;}div {color: blue;font-size: 12px;font-family: Arial;}");
+    };
+
+    auto test10 = []() {
+        docpp::HTML::HTMLSection section = docpp::HTML::HTMLSection(docpp::HTML::SECTION_HTML, {});
+
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 1"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 2"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 3"));
+
+        section.swap(section.find(docpp::HTML::HTMLElement("p", {}, "Test 2")), section.find(docpp::HTML::HTMLElement("p", {}, "Test 3")));
+
+        REQUIRE(section.get() == "<html><p>Test 1</p><p>Test 3</p><p>Test 2</p></html>");
+    };
+
+    auto test11 = []() {
+        docpp::HTML::HTMLSection section = docpp::HTML::HTMLSection(docpp::HTML::SECTION_HTML, {});
+
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 1"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 2"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 3"));
+
+        section.swap(docpp::HTML::HTMLElement("p", {}, "Test 2"), docpp::HTML::HTMLElement("p", {}, "Test 3"));
+
+        REQUIRE(section.get() == "<html><p>Test 1</p><p>Test 3</p><p>Test 2</p></html>");
+    };
+
+    auto test12 = []() {
+        docpp::HTML::HTMLSection section = docpp::HTML::HTMLSection(docpp::HTML::SECTION_HTML, {});
+
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 1"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 2"));
+        section.push_back(docpp::HTML::HTMLElement("p", {}, "Test 3"));
+
+        section.push_front(docpp::HTML::HTMLElement("p", {}, "Test 0"));
+
+        REQUIRE(section.get() == "<html><p>Test 0</p><p>Test 1</p><p>Test 2</p><p>Test 3</p></html>");
+    };
+
+    std::vector<void (*)()> tests{test1, test2, test3, test4, test5, test6, test7, test8, test9, test10, test11, test12};
+
+    for (const auto& test : tests) {
+        test();
+    }
+}