[wp-trac] [WordPress Trac] #43215: Allow wp_kses to pass allowed CSS properties

[WordPress Trac]

#43215: Allow wp_kses to pass allowed CSS properties
-----------------------------+------------------------------
 Reporter:  mclaurent        |       Owner:  (none)
     Type:  feature request  |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Security         |     Version:  4.9.2
 Severity:  normal           |  Resolution:
 Keywords:                   |     Focuses:
-----------------------------+------------------------------

Comment (by davidtheplumber):

 Extend wp_kses to Accept Inline Styles Locally
 Modify wp_kses to support an added level of depth in its configuration,
 allowing you to specify attributes and their allowed values for individual
 HTML elements:

 {{{
 $allowed_output_html = array(
     'script' => array(),
     'noscript' => array(),
     'iframe' => array(
         'src' => array(),
         'width' => array(),
         'height' => array(),
         'style' => array(
             'allowed_properties' => array('display', 'visibility'),
         ),
     ),
 );

 $google_tag_manager_noscript = <<<ENDSTRING
 <noscript><iframe src="https://www.googletagmanager.com/ns.html?id=123"
     height="0" width="0"
 style="display:none;visibility:hidden"></iframe></noscript>
 ENDSTRING;

 echo custom_wp_kses($google_tag_manager_noscript, $allowed_output_html,
 $allowed_output_protocol);

 // Extend wp_kses to parse the "style" key with allowed properties
 function custom_wp_kses($string, $allowed_html, $allowed_protocols) {
     // Parse allowed "style" properties within `wp_kses`.
     // Add your logic for inline styles per element here.
     // Ensure this doesn't modify WordPress core functionality globally.
 }

 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/43215#comment:1>
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