Markup attribute removed as I publish the changes

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EpiServer CMS Version: 10.10.4

I am adding markup to XHTMLString (Rich Text Type) type and When I publish it in CMS it removes the attribute (In my case allowfullscreen="true")

Here is markup

<iframe src="https://players.brightcove.net/1493166405001/default_default/index.html?videoId=5436357443001" allowfullscreen="true" style="position: absolute; top: 0px; right: 0px; bottom: 0px; left: 0px; width: 100%; height: 100%;"></>iframe>

After publish when I recheck the markup I see following.

Any Idea? What's going on

#187641
Edited, Mar 06, 2019 8:10
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Hi, Praful,

Have you check out this forum post?

BR,
Marija

#187643
Jan 30, 2018 16:12
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