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administrator/language/en-GB/plg_system_achecker.ni

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+; Joomla! Project
+; Copyright (C) 2005 - 2020 Open Source Matters. All rights reserved.
+; License GNU General Public License version 2 or later; see LICENSE.txt, see LICENSE.php
+; Note : All ini files need to be saved as UTF-8
+
+PLG_SYSTEM_ACHECKER="System - Accessibility Checker"
+PLG_SYSTEM_ACHECKER_XML_DESCRIPTION="This plugin adds the ability to perform an accessibility check on your site."

administrator/language/en-GB/plg_system_achecker.sys.ini

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+; Joomla! Project
+; Copyright (C) 2005 - 2020 Open Source Matters. All rights reserved.
+; License GNU General Public License version 2 or later; see LICENSE.txt, see LICENSE.php
+; Note : All ini files need to be saved as UTF-8
+
+PLG_SYSTEM_ACCESSIBILITY="System - Additional Accessibility Features"
+PLG_SYSTEM_ACCESSIBILITY_XML_DESCRIPTION="This plugin adds an accessibility toolbar to your site with additional accessibility options."

plugins/system/achecker/achecker.php

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+<?php
+/**
+ * @package     Joomla.Plugin
+ * @subpackage  System.achecker
+ *
+ * @copyright   Copyright (C) 2005 - 2020 Open Source Matters, Inc. All rights reserved.
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+defined('_JEXEC') or die;
+
+use Joomla\CMS\Factory;
+use Joomla\CMS\Language\Text;
+use Joomla\CMS\Plugin\CMSPlugin;
+
+/**
+ * This plugin adds the ability to perform an accessibility check on your site.
+ *
+ * @since  __deploy_version__
+ */
+class PlgSystemAchecker extends CMSPlugin
+{
+	/**
+	 * Application object.
+	 *
+	 * @var    JApplicationCms
+	 * @since  __deploy_version__
+	 */
+	protected $app;
+
+	/**
+	 * Add the javascript and css for the accessibility checker
+	 *
+	 * @return  void
+	 *
+	 * @since   __deploy_version__
+	 */
+	public function onBeforeCompileHead()
+	{
+
+		if ($this->app->isClient('site'))
+		{
+			return;
+		}
+
+		// Get the document object.
+		$document = $this->app->getDocument();
+
+		if ($document->getType() !== 'html')
+		{
+			return;
+		}
+
+		// Load language file.
+		$this->loadLanguage();
+
+		// Determine if it is an LTR or RTL language
+		$direction = Factory::getLanguage()->isRTL() ? 'right' : 'left';
+
+		$document->getWebAssetManager()
+			->useScript('accessibility')
+			->addInlineScript(
+				'window.addEventListener("load", function() {'
+				. 'new Accessibility(Joomla.getOptions("accessibility-options") || {});'
+				. '});',
+				['name' => 'inline.plg.system.accessibility'],
+				['type' => 'module'],
+				['accessibility']
+			);
+	}
+}

plugins/system/achecker/achecker.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<extension type="plugin" group="system" method="upgrade">
+	<name>plg_system_achecker</name>
+	<author>Joomla! Project</author>
+	<creationDate>2020-19-13</creationDate>
+	<copyright>(C) 2005 - 2020 Open Source Matters. All rights reserved.</copyright>
+	<license>GNU General Public License version 2 or later; see LICENSE.txt</license>
+	<authorEmail>admin@joomla.org</authorEmail>
+	<authorUrl>www.joomla.org</authorUrl>
+	<version>4.0.0</version>
+	<description>PLG_SYSTEM_ACHECKER_XML_DESCRIPTION</description>
+	<files>
+		<filename plugin="achecker">achecker.php</filename>
+	</files>
+	<languages folder="admin">
+		<language tag="en-GB">language/en-GB/plg_system_achecker.ini</language>
+		<language tag="en-GB">language/en-GB/plg_system_achecker.sys.ini</language>
+	</languages>
+	<config>
+<!--		<fields name="params">
+			<fieldset name="basic">
+				<field
+					name="section"
+					type="list"
+					label="PLG_SYSTEM_ACCESSIBILITY_SECTION"
+					default="administrator"
+					validate="options"
+					>
+					<option value="site">PLG_SYSTEM_ACCESSIBILITY_SECTION_SITE</option>
+					<option value="administrator">PLG_SYSTEM_ACCESSIBILITY_SECTION_ADMIN</option>
+					<option value="both">PLG_SYSTEM_ACCESSIBILITY_SECTION_BOTH</option>
+				</field>
+			</fieldset>
+		</fields>
+-->	</config>
+</extension>