diff --git src/wp-includes/functions.php src/wp-includes/functions.php
index 9c24d0b..26390f0 100644
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function wp_allowed_protocols() {
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| 4439 | 4439 | static $protocols; |
| 4440 | 4440 | |
| 4441 | 4441 | if ( empty( $protocols ) ) { |
| 4442 | | $protocols = array( 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn', 'tel', 'fax', 'xmpp' ); |
| | 4442 | $protocols = array( 'http', 'https', 'ftp', 'ftps', 'mailto', 'news', 'irc', 'gopher', 'nntp', 'feed', 'telnet', 'mms', 'rtsp', 'svn', 'tel', 'fax', 'xmpp', 'webcal' ); |
| 4443 | 4443 | |
| 4444 | 4444 | /** |
| 4445 | 4445 | * Filter the list of protocols allowed in HTML attributes. |