Why can&#x27;t we just use MP4? Add an inline JavaScript decoder for Mobile Safari, and then at least all the other browsers get instant hardware decoding.<p>Are there trust issues with allowing third-party MP4 embeds into user-submitted content such as forums&#x2F;hosted blogs? Do we need a &quot;no sound&quot;&#x2F;&quot;max file size&quot; attribute on the video tag?