Ticket #1616: data-uri.diff

mu-plugins/jetpack-tweaks.php

@@ -201 +201 @@
  */
 function sanitize_urls_in_css_properties( $url, $property ) {
         $allowed_properties = array( 'background', 'background-image', 'border-image', 'content', 'cursor', 'list-style', 'list-style-image' );
-        $allowed_protocols  = array( 'http', 'https' );
+        $allowed_protocols  = array( 'http', 'https', 'data' );
 
         // Clean up the string
         $url = trim( $url, "' \" \r \n" );