diff --git a/h5p.classes.php b/h5p.classes.php
index 0783038..2f6d31d 100644
--- a/h5p.classes.php
+++ b/h5p.classes.php
@@ -1649,6 +1649,7 @@ class H5PCore {
   const DISABLE_EMBED = 4;
   const DISABLE_COPYRIGHT = 8;
   const DISABLE_ABOUT = 16;
+  const DISABLE_ALL = 31;
 
   // Map flags to string
   public static $disable = array(
@@ -2560,8 +2561,26 @@ class H5PContentValidator {
       if (in_array('del', $tags) || in_array('strike', $tags) && ! in_array('s', $tags)) {
         $tags[] = 's';
       }
+
+      // Determine allowed style tags
+      $stylePatterns = array();
+      if (isset($semantics->font)) {
+        if (isset($semantics->font->size) && $semantics->font->size) {
+          $stylePatterns[] = '/^font-size: *[0-9.]+(em|px|%) *;?$/i';
+        }
+        if (isset($semantics->font->family) && $semantics->font->family) {
+          $stylePatterns[] = '/^font-family: *[a-z0-9," ]+;?$/i';
+        }
+        if (isset($semantics->font->color) && $semantics->font->color) {
+          $stylePatterns[] = '/^color: *(#[a-f0-9]{3}[a-f0-9]{3}?|rgba?\([0-9, ]+\)) *;?$/i';
+        }
+        if (isset($semantics->font->background) && $semantics->font->background) {
+          $stylePatterns[] = '/^background-color: *(#[a-f0-9]{3}[a-f0-9]{3}?|rgba?\([0-9, ]+\)) *;?$/i';
+        }
+      }
+
       // Strip invalid HTML tags.
-      $text = $this->filter_xss($text, $tags);
+      $text = $this->filter_xss($text, $tags, $stylePatterns);
     }
     else {
       // Filter text to plain text.
@@ -2984,7 +3003,7 @@ class H5PContentValidator {
    *
    * @ingroup sanitization
    */
-  private function filter_xss($string, $allowed_tags = array('a', 'em', 'strong', 'cite', 'blockquote', 'code', 'ul', 'ol', 'li', 'dl', 'dt', 'dd')) {
+  private function filter_xss($string, $allowed_tags = array('a', 'em', 'strong', 'cite', 'blockquote', 'code', 'ul', 'ol', 'li', 'dl', 'dt', 'dd'), $allowedStyles = FALSE) {
     if (strlen($string) == 0) {
       return $string;
     }
@@ -2995,6 +3014,8 @@ class H5PContentValidator {
       return '';
     }
 
+    $this->allowedStyles = $allowedStyles;
+
     // Store the text format.
     $this->_filter_xss_split($allowed_tags, TRUE);
     // Remove NULL characters (ignored by some browsers).
@@ -3088,7 +3109,7 @@ class H5PContentValidator {
     $xhtml_slash = $count ? ' /' : '';
 
     // Clean up attributes.
-    $attr2 = implode(' ', $this->_filter_xss_attributes($attrlist));
+    $attr2 = implode(' ', $this->_filter_xss_attributes($attrlist, ($elem === 'span' ? $this->allowedStyles : FALSE)));
     $attr2 = preg_replace('/[<>]/', '', $attr2);
     $attr2 = strlen($attr2) ? ' ' . $attr2 : '';
 
@@ -3101,7 +3122,7 @@ class H5PContentValidator {
    * @return
    *   Cleaned up version of the HTML attributes.
    */
-  private function _filter_xss_attributes($attr) {
+  private function _filter_xss_attributes($attr, $allowedStyles = FALSE) {
     $attrarr = array();
     $mode = 0;
     $attrname = '';
@@ -3141,6 +3162,17 @@ class H5PContentValidator {
         case 2:
           // Attribute value, a URL after href= for instance.
           if (preg_match('/^"([^"]*)"(\s+|$)/', $attr, $match)) {
+            if ($allowedStyles && $attrname === 'style') {
+              // Allow certain styles
+              foreach ($allowedStyles as $pattern) {
+                if (preg_match($pattern, $match[1])) {
+                  $attrarr[] = 'style="' . $match[1] . '"';
+                  break;
+                }
+              }
+              break;
+            }
+
             $thisval = $this->filter_xss_bad_protocol($match[1]);
 
             if (!$skip) {
diff --git a/js/h5p.js b/js/h5p.js
index 6aa425e..26c81a3 100644
--- a/js/h5p.js
+++ b/js/h5p.js
@@ -774,7 +774,7 @@ H5P.newRunnable = function (library, contentId, $attachTo, skipResize, extras) {
  */
 H5P.error = function (err) {
   if (window.console !== undefined && console.error !== undefined) {
-    console.error(err);
+    console.error(err.stack ? err.stack : err);
   }
 };
 
@@ -883,10 +883,17 @@ H5P.getCopyrights = function (instance, parameters, contentId) {
   var copyrights;
 
   if (instance.getCopyrights !== undefined) {
-    // Use the instance's own copyright generator
-    copyrights = instance.getCopyrights();
+    try {
+      // Use the instance's own copyright generator
+      copyrights = instance.getCopyrights();
+    }
+    catch (err) {
+      // Failed, prevent crashing page.
+      H5P.error(err);
+    }
   }
-  else {
+
+  if (copyrights === undefined) {
     // Create a generic flat copyright list
     copyrights = new H5P.ContentCopyrights();
     H5P.findCopyrights(copyrights, parameters, contentId);