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@Velocio
Summary conclusion... it's all too complex for real-user usage, and none of this works on third party embeds.
All of this stuff only really works where the sites own the image upload, conversion, and display of the image.
That isn't the case here... we only have the last bit, and don't have all the pre-requisites available to ensure it works consistently... hell, we don't even know the width and height.
If you produce a proof of concept showing a single URL embed that works consistently on all browsers, and can be guaranteed to be a trusted source for the iframe... I'll use it. But so far, I don't see that.