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Bug 1534081 * This alters the default allowed attributes for iframe and adds: - allowfullscreen - mozallowfullscreen - webkitallowfullscreen All are allowed 0, 1 or empty values. * This resolves issues with vimeo and youtube, who require these attributes before showing the fullscreen icon: https://developer.vimeo.com/player/embedding behatnotneeded: Can't test Flash with behat Change-Id: Ie57c3c3968c4f7cd58a544135351ef506aa6be11
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