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How to add an attribute to CkEditor 4.x iframe tag

Does anyone know of a clean way to add an attribute to an iframe tag, or to add an equivalent parameter to the src attribute? Here is what I am trying to do:

I am using the iframe wysiwyg button in Ckeditor to allow users to paste in a video url from YouTube. The problem is, the mega menu dropdown shows up behind the video. To fix this, the iframe tag for the video either needs to have the attribute wmode="transparent added to it, or the actual src url needs to have the parameter &wmode=transparent appended.

Ideally, this would be enforced and not asked of the user. Has anyone dealt with this and implemented a solution? If so, please let me know what you did. Thanks!

This article was republished from its original source.
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How to add an attribute to CkEditor 4.x iframe tag

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