Adding wmode transparent to WordPress 3 media embeds

Published on November 22, 2010 by , in Wordpress

In case you have a website that uses dropdowns you probably noticed the dropdown panel might get under the flash media (like Youtube video embeds). The fix to this is to setup the wmode attribue to transparent… but how do we do it in WordPress?

Since WordPress 2.9 has enabled us to easily embed videos ( ), it also means we don’t have the ability to change the embed code (to add the wmode transparent for example), and that’s why we have to rely on applying a filter that does that for us.

Simply paste the following at the beginning of your theme’s functions.php (after <?php ), and the wmode attribute will be setup automatically:

function add_video_wmode_transparent($html, $url, $attr) {
   if (strpos($html, "<embed src=" ) !== false) {
    	return str_replace('</param><embed', '</param><param name="wmode" value="transparent"></param><embed wmode="transparent" ', $html);
   } else {
        return $html;
add_filter('embed_oembed_html', 'add_video_wmode_transparent', 10, 3);


As Theo pointed out, the videos can come in in iframes instead of object elements. To make the videos transparent in those cases as well, here’s the updated snippet:

function add_video_wmode_transparent($html, $url, $attr) {

if ( strpos( $html, "<embed src=" ) !== false )
   { return str_replace('</param><embed', '</param><param name="wmode" value="opaque"></param><embed wmode="opaque" ', $html); }
elseif ( strpos ( $html, 'feature=oembed' ) !== false )
   { return str_replace( 'feature=oembed', 'feature=oembed&wmode=opaque', $html ); }
   { return $html; }
add_filter( 'embed_oembed_html', 'add_video_wmode_transparent', 10, 3);

A demo video embedded using built-in oEmbed:

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