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HTML sandbox value replacement for allowfullscreen

What value do you think the sandbox attribute should use for replacement?

6:49 pm on May 26, 2015 (gmt 0)

Senior Member from US 

WebmasterWorld Senior Member jab_creations is a WebmasterWorld Top Contributor of All Time 10+ Year Member

joined:Aug 26, 2004
posts: 3178
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After starting a video template project I noticed YouTube uses the allowfullscreen attribute though I haven't been able to determine it's origins. Looking at documentation about iframe elements and the sandbox attribute it seems that the allowfullscreen should be converted to a value to be used with the sandbox attribute. What do you think would be appropriate?