Re: [w3ctag/design-reviews] Anonymous iframes (#639)

Hello! @handleybeeman, it would cause issues with using web workers, in short : 

To use SharedArrayBuffer the site is required to be cross origin isolated, meaning the headers must look like : 
"Cross-Origin-Embedder-Policy" : "require-corp",
"Cross-Origin-Opener-Policy" : "same-origin",
which would disallow any external Iframes from now existing.
This means that it is impossible to use web workers with SharedArrayBuffer whilst using an Iframe API, for example a Youtube Iframe API. 

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