diff --git a/src/core/features/h5p/assets/fonts/h5p-core-23.eot b/src/core/features/h5p/assets/fonts/h5p-core-23.eot
index f86828cff..0bd4becbb 100644
Binary files a/src/core/features/h5p/assets/fonts/h5p-core-23.eot and b/src/core/features/h5p/assets/fonts/h5p-core-23.eot differ
diff --git a/src/core/features/h5p/assets/fonts/h5p-core-23.svg b/src/core/features/h5p/assets/fonts/h5p-core-23.svg
index dd65f1809..f1b88cbb1 100644
--- a/src/core/features/h5p/assets/fonts/h5p-core-23.svg
+++ b/src/core/features/h5p/assets/fonts/h5p-core-23.svg
@@ -5,52 +5,52 @@
 <json>
 <![CDATA[
 {
-	"fontFamily": "h5p-core-21",
+	"fontFamily": "h5p-core",
 	"description": "Font generated by IcoMoon.",
 	"majorVersion": 1,
 	"minorVersion": 1,
 	"version": "Version 1.1",
-	"fontId": "h5p-core-21",
-	"psName": "h5p-core-21",
+	"fontId": "h5p-core",
+	"psName": "h5p-core",
 	"subFamily": "Regular",
-	"fullName": "h5p-core-21"
+	"fullName": "h5p-core"
 }
 ]]>
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diff --git a/src/core/features/h5p/assets/fonts/h5p-core-23.ttf b/src/core/features/h5p/assets/fonts/h5p-core-23.ttf
index 3a3348adf..e793b63af 100644
Binary files a/src/core/features/h5p/assets/fonts/h5p-core-23.ttf and b/src/core/features/h5p/assets/fonts/h5p-core-23.ttf differ
diff --git a/src/core/features/h5p/assets/fonts/h5p-core-23.woff b/src/core/features/h5p/assets/fonts/h5p-core-23.woff
index ff03f4248..a2f93d0a2 100644
Binary files a/src/core/features/h5p/assets/fonts/h5p-core-23.woff and b/src/core/features/h5p/assets/fonts/h5p-core-23.woff differ
diff --git a/src/core/features/h5p/assets/js/h5p.js b/src/core/features/h5p/assets/js/h5p.js
index 5d2a8f623..ee1888a55 100644
--- a/src/core/features/h5p/assets/js/h5p.js
+++ b/src/core/features/h5p/assets/js/h5p.js
@@ -1030,7 +1030,7 @@ H5P.t = function (key, vars, ns) {
 H5P.Dialog = function (name, title, content, $element) {
   /** @alias H5P.Dialog# */
   var self = this;
-  var $dialog = H5P.jQuery('<div class="h5p-popup-dialog h5p-' + name + '-dialog">\
+  var $dialog = H5P.jQuery('<div class="h5p-popup-dialog h5p-' + name + '-dialog" role="dialog" tabindex="-1">\
                               <div class="h5p-inner">\
                                 <h2>' + title + '</h2>\
                                 <div class="h5p-scroll-content">' + content + '</div>\
@@ -1053,6 +1053,12 @@ H5P.Dialog = function (name, title, content, $element) {
         .click(function () {
           self.close();
         })
+        .keypress(function (e) {
+          if (e.which === 13 || e.which === 32) {
+            self.close();
+            return false;
+          }
+        })
         .end()
       .find('a')
         .click(function (e) {
@@ -1072,6 +1078,7 @@ H5P.Dialog = function (name, title, content, $element) {
       $dialog.addClass('h5p-open'); // Fade in
       // Triggering an event, in case something has to be done after dialog has been opened.
       H5P.jQuery(self).trigger('dialog-opened', [$dialog]);
+      $dialog.focus();
     }, 1);
   };
 
@@ -1083,6 +1090,8 @@ H5P.Dialog = function (name, title, content, $element) {
     setTimeout(function () {
       $dialog.remove();
       H5P.jQuery(self).trigger('dialog-closed', [$dialog]);
+      $element.attr('tabindex', '-1');
+      $element.focus();
     }, 200);
   };
 };
@@ -1363,11 +1372,11 @@ H5P.openEmbedDialog = function ($element, embedCode, resizeCode, size, instance)
       var $expander = H5P.jQuery(this);
       var $content = $expander.next();
       if ($content.is(':visible')) {
-        $expander.removeClass('h5p-open').text(H5P.t('showAdvanced'));
+        $expander.removeClass('h5p-open').text(H5P.t('showAdvanced')).attr('aria-expanded', 'true');
         $content.hide();
       }
       else {
-        $expander.addClass('h5p-open').text(H5P.t('hideAdvanced'));
+        $expander.addClass('h5p-open').text(H5P.t('hideAdvanced')).attr('aria-expanded', 'false');
         $content.show();
       }
       $dialog.find('.h5p-embed-code-container').each(function () {
@@ -1378,6 +1387,7 @@ H5P.openEmbedDialog = function ($element, embedCode, resizeCode, size, instance)
     $dialog.find('.h5p-expander').click(expand).keypress(function (event) {
       if (event.keyCode === 32) {
         expand.apply(this);
+        return false;
       }
     });
   }).on('dialog-closed', function () {
diff --git a/src/core/features/h5p/assets/styles/h5p.css b/src/core/features/h5p/assets/styles/h5p.css
index 1f89e4ead..c8b9b85dc 100644
--- a/src/core/features/h5p/assets/styles/h5p.css
+++ b/src/core/features/h5p/assets/styles/h5p.css
@@ -202,7 +202,7 @@ div.h5p-fullscreen {
   color: #999;
   text-decoration: none;
   outline: none;
-  line-height: 23px;
+  line-height: 22px;
 }
 .h5p-actions > .h5p-button:hover {
   color: #666;
@@ -223,8 +223,8 @@ div.h5p-fullscreen {
 .h5p-actions > .h5p-button:before {
   font-family: 'H5P';
   font-size: 20px;
-  line-height: 20px;
-  vertical-align: top;
+  line-height: 23px;
+  vertical-align: bottom;
   padding-right: 0;
 }
 .h5p-actions > .h5p-button.h5p-export:before {
@@ -367,10 +367,6 @@ div.h5p-fullscreen {
 }
 .h5p-popup-dialog .h5p-close {
   cursor: pointer;
-}
-.h5p-popup-dialog .h5p-close:after {
-  font-family: 'H5P';
-  content: "\e894";
   font-size: 2em;
   position: absolute;
   right: 0;
@@ -383,6 +379,10 @@ div.h5p-fullscreen {
   text-indent: -0.065em;
   z-index: 3
 }
+.h5p-popup-dialog .h5p-close:after {
+  font-family: 'H5P';
+  content: "\e894";
+}
 .h5p-popup-dialog .h5p-close:hover:after,
 .h5p-popup-dialog .h5p-close:focus:after {
   color: #454545;
@@ -412,7 +412,6 @@ div.h5p-fullscreen {
 .h5p-expander {
   cursor: pointer;
   font-size: 1.125em;
-  outline: none;
   margin: 0.5em 0 0;
   display: inline-block;
 }
@@ -543,6 +542,25 @@ div.h5p-fullscreen {
   opacity: 0;
   visibility: hidden;
 }
+.h5p-content code,
+.h5peditor code {
+  color: #3d3d3d;
+  background: #e0e0e0;
+  border-radius: 2px;
+  padding: 0 5px;
+}
+.h5p-content pre > code,
+.h5peditor pre > code {
+  background-color: #fafafa;
+  padding: 5px;
+  display: block;
+  line-height: normal;
+  border: 1px solid #c7c7c7;
+  border-left-width: 4px;
+  max-width: 100%;
+  white-space: pre;
+  overflow: auto;
+}
 
 
 /* This is loaded as part of Core and not Editor since this needs to be outside the editor iframe */
diff --git a/src/core/features/h5p/classes/content-validator.ts b/src/core/features/h5p/classes/content-validator.ts
index dd27fa6ef..0b5598d16 100644
--- a/src/core/features/h5p/classes/content-validator.ts
+++ b/src/core/features/h5p/classes/content-validator.ts
@@ -678,7 +678,7 @@ export class CoreH5PContentValidator {
             return '&lt;';
         }
 
-        const matches = tag.match(/^<\s*(\/\s*)?([a-zA-Z0-9-]+)([^>]*)>?|(<!--.*?-->)$/);
+        const matches = tag.match(/^<\s*(\/\s*)?([a-zA-Z0-9-]+)\s*([^>]*)>?|(<!--.*?-->)$/);
         if (!matches) {
             // Seriously malformed.
             return '';
@@ -746,7 +746,8 @@ export class CoreH5PContentValidator {
                     matches = attr.match(/^([-a-zA-Z]+)/);
                     if (matches && matches.length > 1) {
                         attrName = matches[1].toLowerCase();
-                        skip = (attrName == 'style' || attrName.substr(0, 2) == 'on');
+                        skip = attrName == 'style' || attrName.substr(0, 2) == 'on' || attrName.substr(0, 1) == '-' ||
+                                attrName.length > 96; // Ignore long attributes to avoid unnecessary processing overhead.
                         working = mode = 1;
                         attr = attr.replace(/^[-a-zA-Z]+/, '');
                     }