diff --git a/library/vendor/HTMLPurifier.autoload.php b/library/vendor/HTMLPurifier.autoload.php
index 9d8d29926..7a691132f 100644
--- a/library/vendor/HTMLPurifier.autoload.php
+++ b/library/vendor/HTMLPurifier.autoload.php
@@ -17,6 +17,7 @@ if (function_exists('spl_autoload_register') && function_exists('spl_autoload_un
     require dirname(__FILE__) . '/HTMLPurifier.autoload-legacy.php';
 }
 
+// phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.zend_ze1_compatibility_modeRemoved
 if (ini_get('zend.ze1_compatibility_mode')) {
     trigger_error("HTML Purifier is not compatible with zend.ze1_compatibility_mode; please turn it off", E_USER_ERROR);
 }
diff --git a/library/vendor/HTMLPurifier.php b/library/vendor/HTMLPurifier.php
index bada5188b..26f061276 100644
--- a/library/vendor/HTMLPurifier.php
+++ b/library/vendor/HTMLPurifier.php
@@ -19,7 +19,7 @@
  */
 
 /*
-    HTML Purifier 4.10.0 - Standards Compliant HTML Filtering
+    HTML Purifier 4.15.0 - Standards Compliant HTML Filtering
     Copyright (C) 2006-2008 Edward Z. Yang
 
     This library is free software; you can redistribute it and/or
@@ -58,12 +58,12 @@ class HTMLPurifier
      * Version of HTML Purifier.
      * @type string
      */
-    public $version = '4.10.0';
+    public $version = '4.15.0';
 
     /**
      * Constant with version of HTML Purifier.
      */
-    const VERSION = '4.10.0';
+    const VERSION = '4.15.0';
 
     /**
      * Global configuration object.
@@ -240,12 +240,17 @@ class HTMLPurifier
     public function purifyArray($array_of_html, $config = null)
     {
         $context_array = array();
-        foreach ($array_of_html as $key => $html) {
-            $array_of_html[$key] = $this->purify($html, $config);
+        $array = array();
+        foreach($array_of_html as $key=>$value){
+            if (is_array($value)) {
+                $array[$key] = $this->purifyArray($value, $config);
+            } else {
+                $array[$key] = $this->purify($value, $config);
+            }
             $context_array[$key] = $this->context;
         }
         $this->context = $context_array;
-        return $array_of_html;
+        return $array;
     }
 
     /**
diff --git a/library/vendor/HTMLPurifier/AttrDef/CSS/Background.php b/library/vendor/HTMLPurifier/AttrDef/CSS/Background.php
index 7f1ea3b0f..28c49883a 100644
--- a/library/vendor/HTMLPurifier/AttrDef/CSS/Background.php
+++ b/library/vendor/HTMLPurifier/AttrDef/CSS/Background.php
@@ -25,6 +25,7 @@ class HTMLPurifier_AttrDef_CSS_Background extends HTMLPurifier_AttrDef
         $this->info['background-repeat'] = $def->info['background-repeat'];
         $this->info['background-attachment'] = $def->info['background-attachment'];
         $this->info['background-position'] = $def->info['background-position'];
+        $this->info['background-size'] = $def->info['background-size'];
     }
 
     /**
@@ -53,6 +54,7 @@ class HTMLPurifier_AttrDef_CSS_Background extends HTMLPurifier_AttrDef
         $caught['repeat'] = false;
         $caught['attachment'] = false;
         $caught['position'] = false;
+        $caught['size'] = false;
 
         $i = 0; // number of catches
 
diff --git a/library/vendor/HTMLPurifier/AttrDef/CSS/Number.php b/library/vendor/HTMLPurifier/AttrDef/CSS/Number.php
index 8edc159e7..ef49d20fd 100644
--- a/library/vendor/HTMLPurifier/AttrDef/CSS/Number.php
+++ b/library/vendor/HTMLPurifier/AttrDef/CSS/Number.php
@@ -69,7 +69,13 @@ class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef
             return false;
         }
 
-        $left = ltrim($left, '0');
+        // Remove leading zeros until positive number or a zero stays left
+        if (ltrim($left, '0') != '') {
+            $left = ltrim($left, '0');
+        } else {
+            $left = '0';
+        }
+
         $right = rtrim($right, '0');
 
         if ($right === '') {
diff --git a/library/vendor/HTMLPurifier/AttrDef/HTML/Bool.php b/library/vendor/HTMLPurifier/AttrDef/HTML/Bool.php
index dea15d2cd..be3bbc8dc 100644
--- a/library/vendor/HTMLPurifier/AttrDef/HTML/Bool.php
+++ b/library/vendor/HTMLPurifier/AttrDef/HTML/Bool.php
@@ -7,7 +7,7 @@ class HTMLPurifier_AttrDef_HTML_Bool extends HTMLPurifier_AttrDef
 {
 
     /**
-     * @type bool
+     * @type string
      */
     protected $name;
 
@@ -17,7 +17,7 @@ class HTMLPurifier_AttrDef_HTML_Bool extends HTMLPurifier_AttrDef
     public $minimized = true;
 
     /**
-     * @param bool $name
+     * @param bool|string $name
      */
     public function __construct($name = false)
     {
diff --git a/library/vendor/HTMLPurifier/AttrDef/HTML/ContentEditable.php b/library/vendor/HTMLPurifier/AttrDef/HTML/ContentEditable.php
new file mode 100644
index 000000000..5b03d3e37
--- /dev/null
+++ b/library/vendor/HTMLPurifier/AttrDef/HTML/ContentEditable.php
@@ -0,0 +1,16 @@
+<?php
+
+class HTMLPurifier_AttrDef_HTML_ContentEditable extends HTMLPurifier_AttrDef
+{
+    public function validate($string, $config, $context)
+    {
+        $allowed = array('false');
+        if ($config->get('HTML.Trusted')) {
+            $allowed = array('', 'true', 'false');
+        }
+
+        $enum = new HTMLPurifier_AttrDef_Enum($allowed);
+
+        return $enum->validate($string, $config, $context);
+    }
+}
diff --git a/library/vendor/HTMLPurifier/AttrDef/URI/Host.php b/library/vendor/HTMLPurifier/AttrDef/URI/Host.php
index e54a3344a..1beeaa5d2 100644
--- a/library/vendor/HTMLPurifier/AttrDef/URI/Host.php
+++ b/library/vendor/HTMLPurifier/AttrDef/URI/Host.php
@@ -97,7 +97,11 @@ class HTMLPurifier_AttrDef_URI_Host extends HTMLPurifier_AttrDef
 
         // PHP 5.3 and later support this functionality natively
         if (function_exists('idn_to_ascii')) {
-            $string = idn_to_ascii($string, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
+            if (defined('IDNA_NONTRANSITIONAL_TO_ASCII') && defined('INTL_IDNA_VARIANT_UTS46')) {
+                $string = idn_to_ascii($string, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
+            } else {
+                $string = idn_to_ascii($string);
+            }
 
         // If we have Net_IDNA2 support, we can support IRIs by
         // punycoding them. (This is the most portable thing to do,
diff --git a/library/vendor/HTMLPurifier/AttrTransform/NameSync.php b/library/vendor/HTMLPurifier/AttrTransform/NameSync.php
index 36079b786..5a1fdbbfc 100644
--- a/library/vendor/HTMLPurifier/AttrTransform/NameSync.php
+++ b/library/vendor/HTMLPurifier/AttrTransform/NameSync.php
@@ -8,6 +8,11 @@
 class HTMLPurifier_AttrTransform_NameSync extends HTMLPurifier_AttrTransform
 {
 
+    /**
+     * @type HTMLPurifier_AttrDef_HTML_ID
+     */
+    public $idDef;
+
     public function __construct()
     {
         $this->idDef = new HTMLPurifier_AttrDef_HTML_ID();
diff --git a/library/vendor/HTMLPurifier/AttrTransform/SafeParam.php b/library/vendor/HTMLPurifier/AttrTransform/SafeParam.php
index 1143b4b49..1033106b3 100644
--- a/library/vendor/HTMLPurifier/AttrTransform/SafeParam.php
+++ b/library/vendor/HTMLPurifier/AttrTransform/SafeParam.php
@@ -24,6 +24,11 @@ class HTMLPurifier_AttrTransform_SafeParam extends HTMLPurifier_AttrTransform
      */
     private $uri;
 
+    /**
+     * @type HTMLPurifier_AttrDef_Enum
+     */
+    public $wmode;
+
     public function __construct()
     {
         $this->uri = new HTMLPurifier_AttrDef_URI(true); // embedded
diff --git a/library/vendor/HTMLPurifier/AttrTypes.php b/library/vendor/HTMLPurifier/AttrTypes.php
index 3b70520b6..e4429e86d 100644
--- a/library/vendor/HTMLPurifier/AttrTypes.php
+++ b/library/vendor/HTMLPurifier/AttrTypes.php
@@ -41,6 +41,7 @@ class HTMLPurifier_AttrTypes
         $this->info['IAlign']   = self::makeEnum('top,middle,bottom,left,right');
         $this->info['LAlign']   = self::makeEnum('top,bottom,left,right');
         $this->info['FrameTarget'] = new HTMLPurifier_AttrDef_HTML_FrameTarget();
+        $this->info['ContentEditable'] = new HTMLPurifier_AttrDef_HTML_ContentEditable();
 
         // unimplemented aliases
         $this->info['ContentType'] = new HTMLPurifier_AttrDef_Text();
diff --git a/library/vendor/HTMLPurifier/CSSDefinition.php b/library/vendor/HTMLPurifier/CSSDefinition.php
index 47dfd1f66..3f08b81c5 100644
--- a/library/vendor/HTMLPurifier/CSSDefinition.php
+++ b/library/vendor/HTMLPurifier/CSSDefinition.php
@@ -109,6 +109,22 @@ class HTMLPurifier_CSSDefinition extends HTMLPurifier_Definition
         );
         $this->info['background-position'] = new HTMLPurifier_AttrDef_CSS_BackgroundPosition();
 
+        $this->info['background-size'] = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_Enum(
+                    array(
+                        'auto',
+                        'cover',
+                        'contain',
+                        'initial',
+                        'inherit',
+                    )
+                ),
+                new HTMLPurifier_AttrDef_CSS_Percentage(),
+                new HTMLPurifier_AttrDef_CSS_Length()
+            )
+        );
+
         $border_color =
             $this->info['border-top-color'] =
             $this->info['border-bottom-color'] =
@@ -220,15 +236,25 @@ class HTMLPurifier_CSSDefinition extends HTMLPurifier_Definition
             array(
                 new HTMLPurifier_AttrDef_CSS_Length('0'),
                 new HTMLPurifier_AttrDef_CSS_Percentage(true),
-                new HTMLPurifier_AttrDef_Enum(array('auto'))
+                new HTMLPurifier_AttrDef_Enum(array('auto', 'initial', 'inherit'))
+            )
+        );
+        $trusted_min_wh = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_CSS_Length('0'),
+                new HTMLPurifier_AttrDef_CSS_Percentage(true),
+                new HTMLPurifier_AttrDef_Enum(array('initial', 'inherit'))
+            )
+        );
+        $trusted_max_wh = new HTMLPurifier_AttrDef_CSS_Composite(
+            array(
+                new HTMLPurifier_AttrDef_CSS_Length('0'),
+                new HTMLPurifier_AttrDef_CSS_Percentage(true),
+                new HTMLPurifier_AttrDef_Enum(array('none', 'initial', 'inherit'))
             )
         );
         $max = $config->get('CSS.MaxImgLength');
 
-        $this->info['min-width'] =
-        $this->info['max-width'] =
-        $this->info['min-height'] =
-        $this->info['max-height'] =
         $this->info['width'] =
         $this->info['height'] =
             $max === null ?
@@ -245,6 +271,38 @@ class HTMLPurifier_CSSDefinition extends HTMLPurifier_Definition
                     // For everyone else:
                     $trusted_wh
                 );
+        $this->info['min-width'] =
+        $this->info['min-height'] =
+            $max === null ?
+                $trusted_min_wh :
+                new HTMLPurifier_AttrDef_Switch(
+                    'img',
+                    // For img tags:
+                    new HTMLPurifier_AttrDef_CSS_Composite(
+                        array(
+                            new HTMLPurifier_AttrDef_CSS_Length('0', $max),
+                            new HTMLPurifier_AttrDef_Enum(array('initial', 'inherit'))
+                        )
+                    ),
+                    // For everyone else:
+                    $trusted_min_wh
+                );
+        $this->info['max-width'] =
+        $this->info['max-height'] =
+            $max === null ?
+                $trusted_max_wh :
+                new HTMLPurifier_AttrDef_Switch(
+                    'img',
+                    // For img tags:
+                    new HTMLPurifier_AttrDef_CSS_Composite(
+                        array(
+                            new HTMLPurifier_AttrDef_CSS_Length('0', $max),
+                            new HTMLPurifier_AttrDef_Enum(array('none', 'initial', 'inherit'))
+                        )
+                    ),
+                    // For everyone else:
+                    $trusted_max_wh
+                );
 
         $this->info['text-decoration'] = new HTMLPurifier_AttrDef_CSS_TextDecoration();
 
diff --git a/library/vendor/HTMLPurifier/ChildDef/List.php b/library/vendor/HTMLPurifier/ChildDef/List.php
index 4fc70e0ef..3d584e727 100644
--- a/library/vendor/HTMLPurifier/ChildDef/List.php
+++ b/library/vendor/HTMLPurifier/ChildDef/List.php
@@ -22,6 +22,8 @@ class HTMLPurifier_ChildDef_List extends HTMLPurifier_ChildDef
     // XXX: This whole business with 'wrap' is all a bit unsatisfactory
     public $elements = array('li' => true, 'ul' => true, 'ol' => true);
 
+    public $whitespace;
+
     /**
      * @param array $children
      * @param HTMLPurifier_Config $config
diff --git a/library/vendor/HTMLPurifier/ChildDef/Table.php b/library/vendor/HTMLPurifier/ChildDef/Table.php
index cb6b3e6cd..67c7e9535 100644
--- a/library/vendor/HTMLPurifier/ChildDef/Table.php
+++ b/library/vendor/HTMLPurifier/ChildDef/Table.php
@@ -164,7 +164,7 @@ class HTMLPurifier_ChildDef_Table extends HTMLPurifier_ChildDef
             }
         }
 
-        if (empty($content)) {
+        if (empty($content) && $thead === false && $tfoot === false) {
             return false;
         }
 
diff --git a/library/vendor/HTMLPurifier/Config.php b/library/vendor/HTMLPurifier/Config.php
index f37cf3713..797d26877 100644
--- a/library/vendor/HTMLPurifier/Config.php
+++ b/library/vendor/HTMLPurifier/Config.php
@@ -21,7 +21,7 @@ class HTMLPurifier_Config
      * HTML Purifier's version
      * @type string
      */
-    public $version = '4.10.0';
+    public $version = '4.15.0';
 
     /**
      * Whether or not to automatically finalize
@@ -408,7 +408,7 @@ class HTMLPurifier_Config
      *             maybeGetRawHTMLDefinition, which is more explicitly
      *             named, instead.
      *
-     * @return HTMLPurifier_HTMLDefinition
+     * @return HTMLPurifier_HTMLDefinition|null
      */
     public function getHTMLDefinition($raw = false, $optimized = false)
     {
@@ -427,7 +427,7 @@ class HTMLPurifier_Config
      *             maybeGetRawCSSDefinition, which is more explicitly
      *             named, instead.
      *
-     * @return HTMLPurifier_CSSDefinition
+     * @return HTMLPurifier_CSSDefinition|null
      */
     public function getCSSDefinition($raw = false, $optimized = false)
     {
@@ -446,7 +446,7 @@ class HTMLPurifier_Config
      *             maybeGetRawURIDefinition, which is more explicitly
      *             named, instead.
      *
-     * @return HTMLPurifier_URIDefinition
+     * @return HTMLPurifier_URIDefinition|null
      */
     public function getURIDefinition($raw = false, $optimized = false)
     {
@@ -468,7 +468,7 @@ class HTMLPurifier_Config
      *        maybe semantics is the "right thing to do."
      *
      * @throws HTMLPurifier_Exception
-     * @return HTMLPurifier_Definition
+     * @return HTMLPurifier_Definition|null
      */
     public function getDefinition($type, $raw = false, $optimized = false)
     {
@@ -647,7 +647,7 @@ class HTMLPurifier_Config
     }
 
     /**
-     * @return HTMLPurifier_HTMLDefinition
+     * @return HTMLPurifier_HTMLDefinition|null
      */
     public function maybeGetRawHTMLDefinition()
     {
@@ -655,7 +655,7 @@ class HTMLPurifier_Config
     }
     
     /**
-     * @return HTMLPurifier_CSSDefinition
+     * @return HTMLPurifier_CSSDefinition|null
      */
     public function maybeGetRawCSSDefinition()
     {
@@ -663,7 +663,7 @@ class HTMLPurifier_Config
     }
     
     /**
-     * @return HTMLPurifier_URIDefinition
+     * @return HTMLPurifier_URIDefinition|null
      */
     public function maybeGetRawURIDefinition()
     {
@@ -803,7 +803,7 @@ class HTMLPurifier_Config
         if ($index !== false) {
             $array = (isset($array[$index]) && is_array($array[$index])) ? $array[$index] : array();
         }
-        $mq = $mq_fix && function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc();
+        $mq = $mq_fix && version_compare(PHP_VERSION, '7.4.0', '<') && function_exists('get_magic_quotes_gpc') && get_magic_quotes_gpc();
 
         $allowed = HTMLPurifier_Config::getAllowedDirectivesForForm($allowed, $schema);
         $ret = array();
@@ -890,7 +890,7 @@ class HTMLPurifier_Config
             // zip(tail(trace), trace) -- but PHP is not Haskell har har
             for ($i = 0, $c = count($trace); $i < $c - 1; $i++) {
                 // XXX this is not correct on some versions of HTML Purifier
-                if ($trace[$i + 1]['class'] === 'HTMLPurifier_Config') {
+                if (isset($trace[$i + 1]['class']) && $trace[$i + 1]['class'] === 'HTMLPurifier_Config') {
                     continue;
                 }
                 $frame = $trace[$i];
diff --git a/library/vendor/HTMLPurifier/ConfigSchema.php b/library/vendor/HTMLPurifier/ConfigSchema.php
index 655c0e97a..c3fe8cd4a 100644
--- a/library/vendor/HTMLPurifier/ConfigSchema.php
+++ b/library/vendor/HTMLPurifier/ConfigSchema.php
@@ -100,7 +100,7 @@ class HTMLPurifier_ConfigSchema
      * @param string $key Name of directive
      * @param mixed $default Default value of directive
      * @param string $type Allowed type of the directive. See
-     *      HTMLPurifier_DirectiveDef::$type for allowed values
+     *      HTMLPurifier_VarParser::$types for allowed values
      * @param bool $allow_null Whether or not to allow null values
      */
     public function add($key, $default, $type, $allow_null)
diff --git a/library/vendor/HTMLPurifier/ConfigSchema/schema.ser b/library/vendor/HTMLPurifier/ConfigSchema/schema.ser
index 371e948f1..a5426c736 100644
Binary files a/library/vendor/HTMLPurifier/ConfigSchema/schema.ser and b/library/vendor/HTMLPurifier/ConfigSchema/schema.ser differ
diff --git a/library/vendor/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.RemoveNbsp.txt b/library/vendor/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.RemoveNbsp.txt
index ca17eb1dc..9228dee22 100644
--- a/library/vendor/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.RemoveNbsp.txt
+++ b/library/vendor/HTMLPurifier/ConfigSchema/schema/AutoFormat.RemoveEmpty.RemoveNbsp.txt
@@ -6,7 +6,7 @@ DEFAULT: false
 <p>
   When enabled, HTML Purifier will treat any elements that contain only
   non-breaking spaces as well as regular whitespace as empty, and remove
-  them when %AutoForamt.RemoveEmpty is enabled.
+  them when %AutoFormat.RemoveEmpty is enabled.
 </p>
 <p>
   See %AutoFormat.RemoveEmpty.RemoveNbsp.Exceptions for a list of elements
diff --git a/library/vendor/HTMLPurifier/ConfigSchema/schema/Core.AllowParseManyTags.txt b/library/vendor/HTMLPurifier/ConfigSchema/schema/Core.AllowParseManyTags.txt
new file mode 100644
index 000000000..06278f82a
--- /dev/null
+++ b/library/vendor/HTMLPurifier/ConfigSchema/schema/Core.AllowParseManyTags.txt
@@ -0,0 +1,12 @@
+Core.AllowParseManyTags
+TYPE: bool
+DEFAULT: false
+VERSION: 4.10.1
+--DESCRIPTION--
+<p>
+    This directive allows parsing of many nested tags.
+    If you set true, relaxes any hardcoded limit from the parser.
+    However, in that case it may cause a Dos attack.
+    Be careful when enabling it.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/library/vendor/HTMLPurifier/ConfigSchema/schema/Core.ColorKeywords.txt b/library/vendor/HTMLPurifier/ConfigSchema/schema/Core.ColorKeywords.txt
index c572c14ec..a75844cd5 100644
--- a/library/vendor/HTMLPurifier/ConfigSchema/schema/Core.ColorKeywords.txt
+++ b/library/vendor/HTMLPurifier/ConfigSchema/schema/Core.ColorKeywords.txt
@@ -3,23 +3,154 @@ TYPE: hash
 VERSION: 2.0.0
 --DEFAULT--
 array (
-  'maroon' => '#800000',
-  'red' => '#FF0000',
-  'orange' => '#FFA500',
-  'yellow' => '#FFFF00',
-  'olive' => '#808000',
-  'purple' => '#800080',
-  'fuchsia' => '#FF00FF',
-  'white' => '#FFFFFF',
-  'lime' => '#00FF00',
-  'green' => '#008000',
-  'navy' => '#000080',
-  'blue' => '#0000FF',
+  'aliceblue' => '#F0F8FF',
+  'antiquewhite' => '#FAEBD7',
   'aqua' => '#00FFFF',
-  'teal' => '#008080',
+  'aquamarine' => '#7FFFD4',
+  'azure' => '#F0FFFF',
+  'beige' => '#F5F5DC',
+  'bisque' => '#FFE4C4',
   'black' => '#000000',
-  'silver' => '#C0C0C0',
+  'blanchedalmond' => '#FFEBCD',
+  'blue' => '#0000FF',
+  'blueviolet' => '#8A2BE2',
+  'brown' => '#A52A2A',
+  'burlywood' => '#DEB887',
+  'cadetblue' => '#5F9EA0',
+  'chartreuse' => '#7FFF00',
+  'chocolate' => '#D2691E',
+  'coral' => '#FF7F50',
+  'cornflowerblue' => '#6495ED',
+  'cornsilk' => '#FFF8DC',
+  'crimson' => '#DC143C',
+  'cyan' => '#00FFFF',
+  'darkblue' => '#00008B',
+  'darkcyan' => '#008B8B',
+  'darkgoldenrod' => '#B8860B',
+  'darkgray' => '#A9A9A9',
+  'darkgrey' => '#A9A9A9',
+  'darkgreen' => '#006400',
+  'darkkhaki' => '#BDB76B',
+  'darkmagenta' => '#8B008B',
+  'darkolivegreen' => '#556B2F',
+  'darkorange' => '#FF8C00',
+  'darkorchid' => '#9932CC',
+  'darkred' => '#8B0000',
+  'darksalmon' => '#E9967A',
+  'darkseagreen' => '#8FBC8F',
+  'darkslateblue' => '#483D8B',
+  'darkslategray' => '#2F4F4F',
+  'darkslategrey' => '#2F4F4F',
+  'darkturquoise' => '#00CED1',
+  'darkviolet' => '#9400D3',
+  'deeppink' => '#FF1493',
+  'deepskyblue' => '#00BFFF',
+  'dimgray' => '#696969',
+  'dimgrey' => '#696969',
+  'dodgerblue' => '#1E90FF',
+  'firebrick' => '#B22222',
+  'floralwhite' => '#FFFAF0',
+  'forestgreen' => '#228B22',
+  'fuchsia' => '#FF00FF',
+  'gainsboro' => '#DCDCDC',
+  'ghostwhite' => '#F8F8FF',
+  'gold' => '#FFD700',
+  'goldenrod' => '#DAA520',
   'gray' => '#808080',
+  'grey' => '#808080',
+  'green' => '#008000',
+  'greenyellow' => '#ADFF2F',
+  'honeydew' => '#F0FFF0',
+  'hotpink' => '#FF69B4',
+  'indianred' => '#CD5C5C',
+  'indigo' => '#4B0082',
+  'ivory' => '#FFFFF0',
+  'khaki' => '#F0E68C',
+  'lavender' => '#E6E6FA',
+  'lavenderblush' => '#FFF0F5',
+  'lawngreen' => '#7CFC00',
+  'lemonchiffon' => '#FFFACD',
+  'lightblue' => '#ADD8E6',
+  'lightcoral' => '#F08080',
+  'lightcyan' => '#E0FFFF',
+  'lightgoldenrodyellow' => '#FAFAD2',
+  'lightgray' => '#D3D3D3',
+  'lightgrey' => '#D3D3D3',
+  'lightgreen' => '#90EE90',
+  'lightpink' => '#FFB6C1',
+  'lightsalmon' => '#FFA07A',
+  'lightseagreen' => '#20B2AA',
+  'lightskyblue' => '#87CEFA',
+  'lightslategray' => '#778899',
+  'lightslategrey' => '#778899',
+  'lightsteelblue' => '#B0C4DE',
+  'lightyellow' => '#FFFFE0',
+  'lime' => '#00FF00',
+  'limegreen' => '#32CD32',
+  'linen' => '#FAF0E6',
+  'magenta' => '#FF00FF',
+  'maroon' => '#800000',
+  'mediumaquamarine' => '#66CDAA',
+  'mediumblue' => '#0000CD',
+  'mediumorchid' => '#BA55D3',
+  'mediumpurple' => '#9370DB',
+  'mediumseagreen' => '#3CB371',
+  'mediumslateblue' => '#7B68EE',
+  'mediumspringgreen' => '#00FA9A',
+  'mediumturquoise' => '#48D1CC',
+  'mediumvioletred' => '#C71585',
+  'midnightblue' => '#191970',
+  'mintcream' => '#F5FFFA',
+  'mistyrose' => '#FFE4E1',
+  'moccasin' => '#FFE4B5',
+  'navajowhite' => '#FFDEAD',
+  'navy' => '#000080',
+  'oldlace' => '#FDF5E6',
+  'olive' => '#808000',
+  'olivedrab' => '#6B8E23',
+  'orange' => '#FFA500',
+  'orangered' => '#FF4500',
+  'orchid' => '#DA70D6',
+  'palegoldenrod' => '#EEE8AA',
+  'palegreen' => '#98FB98',
+  'paleturquoise' => '#AFEEEE',
+  'palevioletred' => '#DB7093',
+  'papayawhip' => '#FFEFD5',
+  'peachpuff' => '#FFDAB9',
+  'peru' => '#CD853F',
+  'pink' => '#FFC0CB',
+  'plum' => '#DDA0DD',
+  'powderblue' => '#B0E0E6',
+  'purple' => '#800080',
+  'rebeccapurple' => '#663399',
+  'red' => '#FF0000',
+  'rosybrown' => '#BC8F8F',
+  'royalblue' => '#4169E1',
+  'saddlebrown' => '#8B4513',
+  'salmon' => '#FA8072',
+  'sandybrown' => '#F4A460',
+  'seagreen' => '#2E8B57',
+  'seashell' => '#FFF5EE',
+  'sienna' => '#A0522D',
+  'silver' => '#C0C0C0',
+  'skyblue' => '#87CEEB',
+  'slateblue' => '#6A5ACD',
+  'slategray' => '#708090',
+  'slategrey' => '#708090',
+  'snow' => '#FFFAFA',
+  'springgreen' => '#00FF7F',
+  'steelblue' => '#4682B4',
+  'tan' => '#D2B48C',
+  'teal' => '#008080',
+  'thistle' => '#D8BFD8',
+  'tomato' => '#FF6347',
+  'turquoise' => '#40E0D0',
+  'violet' => '#EE82EE',
+  'wheat' => '#F5DEB3',
+  'white' => '#FFFFFF',
+  'whitesmoke' => '#F5F5F5',
+  'yellow' => '#FFFF00',
+  'yellowgreen' => '#9ACD32'
 )
 --DESCRIPTION--
 
diff --git a/library/vendor/HTMLPurifier/ConfigSchema/schema/HTML.Forms.txt b/library/vendor/HTMLPurifier/ConfigSchema/schema/HTML.Forms.txt
new file mode 100644
index 000000000..4a432d89b
--- /dev/null
+++ b/library/vendor/HTMLPurifier/ConfigSchema/schema/HTML.Forms.txt
@@ -0,0 +1,11 @@
+HTML.Forms
+TYPE: bool
+VERSION: 4.13.0
+DEFAULT: false
+--DESCRIPTION--
+<p>
+    Whether or not to permit form elements in the user input, regardless of
+    %HTML.Trusted value. Please be very careful when using this functionality, as
+    enabling forms in untrusted documents may allow for phishing attacks.
+</p>
+--# vim: et sw=4 sts=4
diff --git a/library/vendor/HTMLPurifier/DefinitionCache/Serializer/README b/library/vendor/HTMLPurifier/DefinitionCache/Serializer/README
old mode 100644
new mode 100755
diff --git a/library/vendor/HTMLPurifier/ElementDef.php b/library/vendor/HTMLPurifier/ElementDef.php
index d5311cedc..57cfd2bb0 100644
--- a/library/vendor/HTMLPurifier/ElementDef.php
+++ b/library/vendor/HTMLPurifier/ElementDef.php
@@ -176,7 +176,7 @@ class HTMLPurifier_ElementDef
 
         if (!empty($def->content_model)) {
             $this->content_model =
-                str_replace("#SUPER", $this->content_model, $def->content_model);
+                str_replace("#SUPER", (string)$this->content_model, $def->content_model);
             $this->child = false;
         }
         if (!empty($def->content_model_type)) {
diff --git a/library/vendor/HTMLPurifier/Encoder.php b/library/vendor/HTMLPurifier/Encoder.php
index 40a24266a..d4791cc1b 100644
--- a/library/vendor/HTMLPurifier/Encoder.php
+++ b/library/vendor/HTMLPurifier/Encoder.php
@@ -398,8 +398,8 @@ class HTMLPurifier_Encoder
             // characters to their true byte-wise ASCII/UTF-8 equivalents.
             $str = strtr($str, self::testEncodingSupportsASCII($encoding));
             return $str;
-        } elseif ($encoding === 'iso-8859-1') {
-            $str = utf8_encode($str);
+        } elseif ($encoding === 'iso-8859-1' && function_exists('mb_convert_encoding')) {
+            $str = mb_convert_encoding($str, 'UTF-8', 'ISO-8859-1');
             return $str;
         }
         $bug = HTMLPurifier_Encoder::testIconvTruncateBug();
@@ -450,8 +450,8 @@ class HTMLPurifier_Encoder
             // Normal stuff
             $str = self::iconv('utf-8', $encoding . '//IGNORE', $str);
             return $str;
-        } elseif ($encoding === 'iso-8859-1') {
-            $str = utf8_decode($str);
+        } elseif ($encoding === 'iso-8859-1' && function_exists('mb_convert_encoding')) {
+            $str = mb_convert_encoding($str, 'ISO-8859-1', 'UTF-8');
             return $str;
         }
         trigger_error('Encoding not supported', E_USER_ERROR);
diff --git a/library/vendor/HTMLPurifier/EntityParser.php b/library/vendor/HTMLPurifier/EntityParser.php
index c372b5a6a..3ef2d09ec 100644
--- a/library/vendor/HTMLPurifier/EntityParser.php
+++ b/library/vendor/HTMLPurifier/EntityParser.php
@@ -118,7 +118,7 @@ class HTMLPurifier_EntityParser
         $entity = $matches[0];
         $hex_part = @$matches[1];
         $dec_part = @$matches[2];
-        $named_part = empty($matches[3]) ? @$matches[4] : $matches[3];
+        $named_part = empty($matches[3]) ? (empty($matches[4]) ? "" : $matches[4]) : $matches[3];
         if ($hex_part !== NULL && $hex_part !== "") {
             return HTMLPurifier_Encoder::unichr(hexdec($hex_part));
         } elseif ($dec_part !== NULL && $dec_part !== "") {
diff --git a/library/vendor/HTMLPurifier/HTMLModule.php b/library/vendor/HTMLPurifier/HTMLModule.php
index bb3a9230b..9dbb98729 100644
--- a/library/vendor/HTMLPurifier/HTMLModule.php
+++ b/library/vendor/HTMLPurifier/HTMLModule.php
@@ -132,9 +132,9 @@ class HTMLPurifier_HTMLModule
      * @param string $element Name of element to add
      * @param string|bool $type What content set should element be registered to?
      *              Set as false to skip this step.
-     * @param string $contents Allowed children in form of:
+     * @param string|HTMLPurifier_ChildDef $contents Allowed children in form of:
      *              "$content_model_type: $content_model"
-     * @param array $attr_includes What attribute collections to register to
+     * @param array|string $attr_includes What attribute collections to register to
      *              element?
      * @param array $attr What unique attributes does the element define?
      * @see HTMLPurifier_ElementDef:: for in-depth descriptions of these parameters.
@@ -257,8 +257,9 @@ class HTMLPurifier_HTMLModule
      */
     public function makeLookup($list)
     {
+        $args = func_get_args();
         if (is_string($list)) {
-            $list = func_get_args();
+            $list = $args;
         }
         $ret = array();
         foreach ($list as $value) {
diff --git a/library/vendor/HTMLPurifier/HTMLModule/CommonAttributes.php b/library/vendor/HTMLPurifier/HTMLModule/CommonAttributes.php
index a96ab1bef..7220c14cc 100644
--- a/library/vendor/HTMLPurifier/HTMLModule/CommonAttributes.php
+++ b/library/vendor/HTMLPurifier/HTMLModule/CommonAttributes.php
@@ -17,6 +17,7 @@ class HTMLPurifier_HTMLModule_CommonAttributes extends HTMLPurifier_HTMLModule
             'class' => 'Class',
             'id' => 'ID',
             'title' => 'CDATA',
+            'contenteditable' => 'ContentEditable',
         ),
         'Lang' => array(),
         'I18N' => array(
diff --git a/library/vendor/HTMLPurifier/HTMLModule/Forms.php b/library/vendor/HTMLPurifier/HTMLModule/Forms.php
index 6f7ddbc05..eb0edcffd 100644
--- a/library/vendor/HTMLPurifier/HTMLModule/Forms.php
+++ b/library/vendor/HTMLPurifier/HTMLModule/Forms.php
@@ -28,6 +28,10 @@ class HTMLPurifier_HTMLModule_Forms extends HTMLPurifier_HTMLModule
      */
     public function setup($config)
     {
+        if ($config->get('HTML.Forms')) {
+            $this->safe = true;
+        }
+
         $form = $this->addElement(
             'form',
             'Form',
diff --git a/library/vendor/HTMLPurifier/HTMLModule/SafeScripting.php b/library/vendor/HTMLPurifier/HTMLModule/SafeScripting.php
index 0330cd97f..aea7584c3 100644
--- a/library/vendor/HTMLPurifier/HTMLModule/SafeScripting.php
+++ b/library/vendor/HTMLPurifier/HTMLModule/SafeScripting.php
@@ -23,13 +23,13 @@ class HTMLPurifier_HTMLModule_SafeScripting extends HTMLPurifier_HTMLModule
         $script = $this->addElement(
             'script',
             'Inline',
-            'Empty',
+            'Optional:', // Not `Empty` to not allow to autoclose the <script /> tag @see https://www.w3.org/TR/html4/interact/scripts.html
             null,
             array(
                 // While technically not required by the spec, we're forcing
                 // it to this value.
                 'type' => 'Enum#text/javascript',
-                'src*' => new HTMLPurifier_AttrDef_Enum(array_keys($allowed))
+                'src*' => new HTMLPurifier_AttrDef_Enum(array_keys($allowed), /*case sensitive*/ true)
             )
         );
         $script->attr_transform_pre[] =
diff --git a/library/vendor/HTMLPurifier/HTMLModule/Tidy.php b/library/vendor/HTMLPurifier/HTMLModule/Tidy.php
index 08aa23247..12173ba70 100644
--- a/library/vendor/HTMLPurifier/HTMLModule/Tidy.php
+++ b/library/vendor/HTMLPurifier/HTMLModule/Tidy.php
@@ -146,10 +146,7 @@ class HTMLPurifier_HTMLModule_Tidy extends HTMLPurifier_HTMLModule
                         $type = "info_$type";
                         $e = $this;
                     }
-                    // PHP does some weird parsing when I do
-                    // $e->$type[$attr], so I have to assign a ref.
-                    $f =& $e->$type;
-                    $f[$attr] = $fix;
+                    $e->{$type}[$attr] = $fix;
                     break;
                 case 'tag_transform':
                     $this->info_tag_transform[$params['element']] = $fix;
diff --git a/library/vendor/HTMLPurifier/HTMLModule/Tidy/XHTMLAndHTML4.php b/library/vendor/HTMLPurifier/HTMLModule/Tidy/XHTMLAndHTML4.php
index c4f16a4dc..9ee3ffcc9 100644
--- a/library/vendor/HTMLPurifier/HTMLModule/Tidy/XHTMLAndHTML4.php
+++ b/library/vendor/HTMLPurifier/HTMLModule/Tidy/XHTMLAndHTML4.php
@@ -96,6 +96,7 @@ class HTMLPurifier_HTMLModule_Tidy_XHTMLAndHTML4 extends HTMLPurifier_HTMLModule
 
         // @bgcolor for table, tr, td, th ---------------------------------
         $r['table@bgcolor'] =
+        $r['tr@bgcolor'] =
         $r['td@bgcolor'] =
         $r['th@bgcolor'] =
             new HTMLPurifier_AttrTransform_BgColor();
@@ -167,9 +168,11 @@ class HTMLPurifier_HTMLModule_Tidy_XHTMLAndHTML4 extends HTMLPurifier_HTMLModule
         // @vspace for img ------------------------------------------------
         $r['img@vspace'] = new HTMLPurifier_AttrTransform_ImgSpace('vspace');
 
-        // @width for hr, td, th ------------------------------------------
+        // @width for table, hr, td, th, col ------------------------------------------
+        $r['table@width'] =
         $r['td@width'] =
         $r['th@width'] =
+        $r['col@width'] =
         $r['hr@width'] = new HTMLPurifier_AttrTransform_Length('width');
 
         return $r;
diff --git a/library/vendor/HTMLPurifier/Injector/Linkify.php b/library/vendor/HTMLPurifier/Injector/Linkify.php
index 74f83eaa7..3b6d70f6e 100644
--- a/library/vendor/HTMLPurifier/Injector/Linkify.php
+++ b/library/vendor/HTMLPurifier/Injector/Linkify.php
@@ -40,6 +40,9 @@ class HTMLPurifier_Injector_Linkify extends HTMLPurifier_Injector
             '/\\b((?:[a-z][\\w\\-]+:(?:\\/{1,3}|[a-z0-9%])|www\\d{0,3}[.]|[a-z0-9.\\-]+[.][a-z]{2,4}\\/)(?:[^\\s()<>]|\\((?:[^\\s()<>]|(?:\\([^\\s()<>]+\\)))*\\))+(?:\\((?:[^\\s()<>]|(?:\\([^\\s()<>]+\\)))*\\)|[^\\s`!()\\[\\]{};:\'".,<>?\x{00ab}\x{00bb}\x{201c}\x{201d}\x{2018}\x{2019}]))/iu',
             $token->data, -1, PREG_SPLIT_DELIM_CAPTURE);
 
+        if ($bits === false) {
+            return;
+        }
 
         $token = array();
 
diff --git a/library/vendor/HTMLPurifier/Injector/RemoveSpansWithoutAttributes.php b/library/vendor/HTMLPurifier/Injector/RemoveSpansWithoutAttributes.php
index 9ee7aa84d..42d514447 100644
--- a/library/vendor/HTMLPurifier/Injector/RemoveSpansWithoutAttributes.php
+++ b/library/vendor/HTMLPurifier/Injector/RemoveSpansWithoutAttributes.php
@@ -31,6 +31,16 @@ class HTMLPurifier_Injector_RemoveSpansWithoutAttributes extends HTMLPurifier_In
      */
     private $context;
 
+    /**
+     * @type SplObjectStorage
+     */
+    private $markForDeletion;
+
+    public function __construct()
+    {
+        $this->markForDeletion = new SplObjectStorage();
+    }
+
     public function prepare($config, $context)
     {
         $this->attrValidator = new HTMLPurifier_AttrValidator();
@@ -64,7 +74,7 @@ class HTMLPurifier_Injector_RemoveSpansWithoutAttributes extends HTMLPurifier_In
 
         if ($current instanceof HTMLPurifier_Token_End && $current->name === 'span') {
             // Mark closing span tag for deletion
-            $current->markForDeletion = true;
+            $this->markForDeletion->attach($current);
             // Delete open span tag
             $token = false;
         }
@@ -75,7 +85,8 @@ class HTMLPurifier_Injector_RemoveSpansWithoutAttributes extends HTMLPurifier_In
      */
     public function handleEnd(&$token)
     {
-        if ($token->markForDeletion) {
+        if ($this->markForDeletion->contains($token)) {
+            $this->markForDeletion->detach($token);
             $token = false;
         }
     }
diff --git a/library/vendor/HTMLPurifier/Language/classes/en-x-test.php b/library/vendor/HTMLPurifier/Language/classes/en-x-test.php
deleted file mode 100644
index 8828f5cde..000000000
--- a/library/vendor/HTMLPurifier/Language/classes/en-x-test.php
+++ /dev/null
@@ -1,9 +0,0 @@
-<?php
-
-// private class for unit testing
-
-class HTMLPurifier_Language_en_x_test extends HTMLPurifier_Language
-{
-}
-
-// vim: et sw=4 sts=4
diff --git a/library/vendor/HTMLPurifier/Language/messages/en-x-test.php b/library/vendor/HTMLPurifier/Language/messages/en-x-test.php
deleted file mode 100644
index 1c046f379..000000000
--- a/library/vendor/HTMLPurifier/Language/messages/en-x-test.php
+++ /dev/null
@@ -1,11 +0,0 @@
-<?php
-
-// private language message file for unit testing purposes
-
-$fallback = 'en';
-
-$messages = array(
-    'HTMLPurifier' => 'HTML Purifier X'
-);
-
-// vim: et sw=4 sts=4
diff --git a/library/vendor/HTMLPurifier/Language/messages/en-x-testmini.php b/library/vendor/HTMLPurifier/Language/messages/en-x-testmini.php
deleted file mode 100644
index 806c83fbf..000000000
--- a/library/vendor/HTMLPurifier/Language/messages/en-x-testmini.php
+++ /dev/null
@@ -1,12 +0,0 @@
-<?php
-
-// private language message file for unit testing purposes
-// this language file has no class associated with it
-
-$fallback = 'en';
-
-$messages = array(
-    'HTMLPurifier' => 'HTML Purifier XNone'
-);
-
-// vim: et sw=4 sts=4
diff --git a/library/vendor/HTMLPurifier/Length.php b/library/vendor/HTMLPurifier/Length.php
index e70da55a9..b6ea12345 100644
--- a/library/vendor/HTMLPurifier/Length.php
+++ b/library/vendor/HTMLPurifier/Length.php
@@ -78,7 +78,7 @@ class HTMLPurifier_Length
         if ($this->n === '0' && $this->unit === false) {
             return true;
         }
-        if (!ctype_lower($this->unit)) {
+        if ($this->unit === false || !ctype_lower($this->unit)) {
             $this->unit = strtolower($this->unit);
         }
         if (!isset(HTMLPurifier_Length::$allowedUnits[$this->unit])) {
diff --git a/library/vendor/HTMLPurifier/Lexer.php b/library/vendor/HTMLPurifier/Lexer.php
index e9da3ed5e..c21f36491 100644
--- a/library/vendor/HTMLPurifier/Lexer.php
+++ b/library/vendor/HTMLPurifier/Lexer.php
@@ -48,6 +48,11 @@ class HTMLPurifier_Lexer
      */
     public $tracksLineNumbers = false;
 
+    /**
+     * @type HTMLPurifier_EntityParser
+     */
+    private $_entity_parser;
+
     // -- STATIC ----------------------------------------------------------
 
     /**
@@ -306,8 +311,8 @@ class HTMLPurifier_Lexer
     {
         // normalize newlines to \n
         if ($config->get('Core.NormalizeNewlines')) {
-            $html = str_replace("\r\n", "\n", $html);
-            $html = str_replace("\r", "\n", $html);
+            $html = str_replace("\r\n", "\n", (string)$html);
+            $html = str_replace("\r", "\n", (string)$html);
         }
 
         if ($config->get('HTML.Trusted')) {
diff --git a/library/vendor/HTMLPurifier/Lexer/DOMLex.php b/library/vendor/HTMLPurifier/Lexer/DOMLex.php
index 6238a99e3..ca5f25b84 100644
--- a/library/vendor/HTMLPurifier/Lexer/DOMLex.php
+++ b/library/vendor/HTMLPurifier/Lexer/DOMLex.php
@@ -68,8 +68,18 @@ class HTMLPurifier_Lexer_DOMLex extends HTMLPurifier_Lexer
         $doc = new DOMDocument();
         $doc->encoding = 'UTF-8'; // theoretically, the above has this covered
 
+        $options = 0;
+        if ($config->get('Core.AllowParseManyTags') && defined('LIBXML_PARSEHUGE')) {
+            $options |= LIBXML_PARSEHUGE;
+        }
+
         set_error_handler(array($this, 'muteErrorHandler'));
-        $doc->loadHTML($html);
+        // loadHTML() fails on PHP 5.3 when second parameter is given
+        if ($options) {
+            $doc->loadHTML($html, $options);
+        } else {
+            $doc->loadHTML($html);
+        }
         restore_error_handler();
 
         $body = $doc->getElementsByTagName('html')->item(0)-> // <html>
@@ -133,11 +143,11 @@ class HTMLPurifier_Lexer_DOMLex extends HTMLPurifier_Lexer
      */
     protected function getTagName($node)
     {
-        if (property_exists($node, 'tagName')) {
+        if (isset($node->tagName)) {
             return $node->tagName;
-        } else if (property_exists($node, 'nodeName')) {
+        } else if (isset($node->nodeName)) {
             return $node->nodeName;
-        } else if (property_exists($node, 'localName')) {
+        } else if (isset($node->localName)) {
             return $node->localName;
         }
         return null;
@@ -150,11 +160,11 @@ class HTMLPurifier_Lexer_DOMLex extends HTMLPurifier_Lexer
      */
     protected function getData($node)
     {
-        if (property_exists($node, 'data')) {
+        if (isset($node->data)) {
             return $node->data;
-        } else if (property_exists($node, 'nodeValue')) {
+        } else if (isset($node->nodeValue)) {
             return $node->nodeValue;
-        } else if (property_exists($node, 'textContent')) {
+        } else if (isset($node->textContent)) {
             return $node->textContent;
         }
         return null;
diff --git a/library/vendor/HTMLPurifier/Lexer/PH5P.php b/library/vendor/HTMLPurifier/Lexer/PH5P.php
index 72476ddf3..1564f283d 100644
--- a/library/vendor/HTMLPurifier/Lexer/PH5P.php
+++ b/library/vendor/HTMLPurifier/Lexer/PH5P.php
@@ -4410,7 +4410,7 @@ class HTML5TreeConstructer
 
         foreach ($token['attr'] as $attr) {
             if (!$el->hasAttribute($attr['name'])) {
-                $el->setAttribute($attr['name'], $attr['value']);
+                $el->setAttribute($attr['name'], (string)$attr['value']);
             }
         }
 
diff --git a/library/vendor/HTMLPurifier/Printer/ConfigForm.php b/library/vendor/HTMLPurifier/Printer/ConfigForm.php
index 65a777904..33ae11397 100644
--- a/library/vendor/HTMLPurifier/Printer/ConfigForm.php
+++ b/library/vendor/HTMLPurifier/Printer/ConfigForm.php
@@ -48,7 +48,7 @@ class HTMLPurifier_Printer_ConfigForm extends HTMLPurifier_Printer
         $this->compress = $compress;
         // initialize sub-printers
         $this->fields[0] = new HTMLPurifier_Printer_ConfigForm_default();
-        $this->fields[HTMLPurifier_VarParser::BOOL] = new HTMLPurifier_Printer_ConfigForm_bool();
+        $this->fields[HTMLPurifier_VarParser::C_BOOL] = new HTMLPurifier_Printer_ConfigForm_bool();
     }
 
     /**
@@ -339,7 +339,7 @@ class HTMLPurifier_Printer_ConfigForm_default extends HTMLPurifier_Printer
                     $value = '';
             }
         }
-        if ($type === HTMLPurifier_VarParser::MIXED) {
+        if ($type === HTMLPurifier_VarParser::C_MIXED) {
             return 'Not supported';
             $value = serialize($value);
         }
diff --git a/library/vendor/HTMLPurifier/Printer/HTMLDefinition.php b/library/vendor/HTMLPurifier/Printer/HTMLDefinition.php
index 5f2f2f8a7..ae8639176 100644
--- a/library/vendor/HTMLPurifier/Printer/HTMLDefinition.php
+++ b/library/vendor/HTMLPurifier/Printer/HTMLDefinition.php
@@ -43,8 +43,8 @@ class HTMLPurifier_Printer_HTMLDefinition extends HTMLPurifier_Printer
         $ret .= $this->element('caption', 'Doctype');
         $ret .= $this->row('Name', $doctype->name);
         $ret .= $this->row('XML', $doctype->xml ? 'Yes' : 'No');
-        $ret .= $this->row('Default Modules', implode($doctype->modules, ', '));
-        $ret .= $this->row('Default Tidy Modules', implode($doctype->tidyModules, ', '));
+        $ret .= $this->row('Default Modules', implode(', ', $doctype->modules));
+        $ret .= $this->row('Default Tidy Modules', implode(', ', $doctype->tidyModules));
         $ret .= $this->end('table');
         return $ret;
     }
diff --git a/library/vendor/HTMLPurifier/PropertyListIterator.php b/library/vendor/HTMLPurifier/PropertyListIterator.php
index 15b330ea3..f68fc8c30 100644
--- a/library/vendor/HTMLPurifier/PropertyListIterator.php
+++ b/library/vendor/HTMLPurifier/PropertyListIterator.php
@@ -29,6 +29,7 @@ class HTMLPurifier_PropertyListIterator extends FilterIterator
     /**
      * @return bool
      */
+    #[\ReturnTypeWillChange]
     public function accept()
     {
         $key = $this->getInnerIterator()->key();
diff --git a/library/vendor/HTMLPurifier/SOURCE b/library/vendor/HTMLPurifier/SOURCE
index 300aff650..56f423d73 100644
--- a/library/vendor/HTMLPurifier/SOURCE
+++ b/library/vendor/HTMLPurifier/SOURCE
@@ -1,10 +1,10 @@
 GLOBIGNORE=$0; rm -rf *
 rm ../HTMLPurifier*.php
 
-curl https://codeload.github.com/ezyang/htmlpurifier/tar.gz/v4.10.0 -o htmlpurifier-4.10.0.tar.gz
-tar xzf htmlpurifier-4.10.0.tar.gz --strip-components 1 htmlpurifier-4.10.0/LICENSE
-tar xzf htmlpurifier-4.10.0.tar.gz --strip-components 1 htmlpurifier-4.10.0/VERSION
-tar xzf htmlpurifier-4.10.0.tar.gz -C ../ --strip-components 2 htmlpurifier-4.10.0/library/HTMLPurifier.php
-tar xzf htmlpurifier-4.10.0.tar.gz -C ../ --strip-components 2 htmlpurifier-4.10.0/library/HTMLPurifier.autoload.php
-tar xzf htmlpurifier-4.10.0.tar.gz --strip-components 3 htmlpurifier-4.10.0/library/HTMLPurifier/*
-rm htmlpurifier-4.10.0.tar.gz
+curl https://codeload.github.com/ezyang/htmlpurifier/tar.gz/v4.16.0 -o htmlpurifier-4.16.0.tar.gz
+tar xzf htmlpurifier-4.16.0.tar.gz --strip-components 1 htmlpurifier-4.16.0/LICENSE
+tar xzf htmlpurifier-4.16.0.tar.gz --strip-components 1 htmlpurifier-4.16.0/VERSION
+tar xzf htmlpurifier-4.16.0.tar.gz -C ../ --strip-components 2 htmlpurifier-4.16.0/library/HTMLPurifier.php
+tar xzf htmlpurifier-4.16.0.tar.gz -C ../ --strip-components 2 htmlpurifier-4.16.0/library/HTMLPurifier.autoload.php
+tar xzf htmlpurifier-4.16.0.tar.gz --wildcards --strip-components 3 htmlpurifier-4.16.0/library/HTMLPurifier/*
+rm htmlpurifier-4.16.0.tar.gz
diff --git a/library/vendor/HTMLPurifier/StringHash.php b/library/vendor/HTMLPurifier/StringHash.php
index c07370197..c41ae3a76 100644
--- a/library/vendor/HTMLPurifier/StringHash.php
+++ b/library/vendor/HTMLPurifier/StringHash.php
@@ -20,6 +20,7 @@ class HTMLPurifier_StringHash extends ArrayObject
      * @param mixed $index
      * @return mixed
      */
+    #[\ReturnTypeWillChange]
     public function offsetGet($index)
     {
         $this->accessed[$index] = true;
diff --git a/library/vendor/HTMLPurifier/URIFilter/HostBlacklist.php b/library/vendor/HTMLPurifier/URIFilter/HostBlacklist.php
index a6645c17e..32197c0e6 100644
--- a/library/vendor/HTMLPurifier/URIFilter/HostBlacklist.php
+++ b/library/vendor/HTMLPurifier/URIFilter/HostBlacklist.php
@@ -35,7 +35,7 @@ class HTMLPurifier_URIFilter_HostBlacklist extends HTMLPurifier_URIFilter
     public function filter(&$uri, $config, $context)
     {
         foreach ($this->blacklist as $blacklisted_host_fragment) {
-            if (strpos($uri->host, $blacklisted_host_fragment) !== false) {
+            if ($uri->host !== null && strpos($uri->host, $blacklisted_host_fragment) !== false) {
                 return false;
             }
         }
diff --git a/library/vendor/HTMLPurifier/URIFilter/Munge.php b/library/vendor/HTMLPurifier/URIFilter/Munge.php
index 6e03315a1..e1393deb7 100644
--- a/library/vendor/HTMLPurifier/URIFilter/Munge.php
+++ b/library/vendor/HTMLPurifier/URIFilter/Munge.php
@@ -100,11 +100,11 @@ class HTMLPurifier_URIFilter_Munge extends HTMLPurifier_URIFilter
         $string = $uri->toString();
         // always available
         $this->replace['%s'] = $string;
-        $this->replace['%r'] = $context->get('EmbeddedURI', true);
-        $token = $context->get('CurrentToken', true);
-        $this->replace['%n'] = $token ? $token->name : null;
-        $this->replace['%m'] = $context->get('CurrentAttr', true);
-        $this->replace['%p'] = $context->get('CurrentCSSProperty', true);
+        $this->replace['%r'] = $context->get('EmbeddedURI', true) ?: '';
+        $token = $context->get('CurrentToken', true) ?: '';
+        $this->replace['%n'] = $token ? $token->name : '';
+        $this->replace['%m'] = $context->get('CurrentAttr', true) ?: '';
+        $this->replace['%p'] = $context->get('CurrentCSSProperty', true) ?: '';
         // not always available
         if ($this->secretKey) {
             $this->replace['%t'] = hash_hmac("sha256", $string, $this->secretKey);
diff --git a/library/vendor/HTMLPurifier/VERSION b/library/vendor/HTMLPurifier/VERSION
index 1910ba9d2..f029ee574 100644
--- a/library/vendor/HTMLPurifier/VERSION
+++ b/library/vendor/HTMLPurifier/VERSION
@@ -1 +1 @@
-4.10.0
\ No newline at end of file
+4.15.0
\ No newline at end of file
diff --git a/library/vendor/HTMLPurifier/VarParser.php b/library/vendor/HTMLPurifier/VarParser.php
index 50cba6910..0c97c8289 100644
--- a/library/vendor/HTMLPurifier/VarParser.php
+++ b/library/vendor/HTMLPurifier/VarParser.php
@@ -7,34 +7,34 @@
 class HTMLPurifier_VarParser
 {
 
-    const STRING = 1;
+    const C_STRING = 1;
     const ISTRING = 2;
     const TEXT = 3;
     const ITEXT = 4;
-    const INT = 5;
-    const FLOAT = 6;
-    const BOOL = 7;
+    const C_INT = 5;
+    const C_FLOAT = 6;
+    const C_BOOL = 7;
     const LOOKUP = 8;
     const ALIST = 9;
     const HASH = 10;
-    const MIXED = 11;
+    const C_MIXED = 11;
 
     /**
      * Lookup table of allowed types. Mainly for backwards compatibility, but
      * also convenient for transforming string type names to the integer constants.
      */
     public static $types = array(
-        'string' => self::STRING,
+        'string' => self::C_STRING,
         'istring' => self::ISTRING,
         'text' => self::TEXT,
         'itext' => self::ITEXT,
-        'int' => self::INT,
-        'float' => self::FLOAT,
-        'bool' => self::BOOL,
+        'int' => self::C_INT,
+        'float' => self::C_FLOAT,
+        'bool' => self::C_BOOL,
         'lookup' => self::LOOKUP,
         'list' => self::ALIST,
         'hash' => self::HASH,
-        'mixed' => self::MIXED
+        'mixed' => self::C_MIXED
     );
 
     /**
@@ -42,7 +42,7 @@ class HTMLPurifier_VarParser
      * allowed value lists.
      */
     public static $stringTypes = array(
-        self::STRING => true,
+        self::C_STRING => true,
         self::ISTRING => true,
         self::TEXT => true,
         self::ITEXT => true,
@@ -74,7 +74,7 @@ class HTMLPurifier_VarParser
         // These are basic checks, to make sure nothing horribly wrong
         // happened in our implementations.
         switch ($type) {
-            case (self::STRING):
+            case (self::C_STRING):
             case (self::ISTRING):
             case (self::TEXT):
             case (self::ITEXT):
@@ -85,17 +85,17 @@ class HTMLPurifier_VarParser
                     $var = strtolower($var);
                 }
                 return $var;
-            case (self::INT):
+            case (self::C_INT):
                 if (!is_int($var)) {
                     break;
                 }
                 return $var;
-            case (self::FLOAT):
+            case (self::C_FLOAT):
                 if (!is_float($var)) {
                     break;
                 }
                 return $var;
-            case (self::BOOL):
+            case (self::C_BOOL):
                 if (!is_bool($var)) {
                     break;
                 }
@@ -119,7 +119,7 @@ class HTMLPurifier_VarParser
                     }
                 }
                 return $var;
-            case (self::MIXED):
+            case (self::C_MIXED):
                 return $var;
             default:
                 $this->errorInconsistent(get_class($this), $type);
diff --git a/library/vendor/HTMLPurifier/VarParser/Flexible.php b/library/vendor/HTMLPurifier/VarParser/Flexible.php
index b15016c5b..3bfbe8386 100644
--- a/library/vendor/HTMLPurifier/VarParser/Flexible.php
+++ b/library/vendor/HTMLPurifier/VarParser/Flexible.php
@@ -23,23 +23,23 @@ class HTMLPurifier_VarParser_Flexible extends HTMLPurifier_VarParser
             // Note: if code "breaks" from the switch, it triggers a generic
             // exception to be thrown. Specific errors can be specifically
             // done here.
-            case self::MIXED:
+            case self::C_MIXED:
             case self::ISTRING:
-            case self::STRING:
+            case self::C_STRING:
             case self::TEXT:
             case self::ITEXT:
                 return $var;
-            case self::INT:
+            case self::C_INT:
                 if (is_string($var) && ctype_digit($var)) {
                     $var = (int)$var;
                 }
                 return $var;
-            case self::FLOAT:
+            case self::C_FLOAT:
                 if ((is_string($var) && is_numeric($var)) || is_int($var)) {
                     $var = (float)$var;
                 }
                 return $var;
-            case self::BOOL:
+            case self::C_BOOL:
                 if (is_int($var) && ($var === 0 || $var === 1)) {
                     $var = (bool)$var;
                 } elseif (is_string($var)) {