I dig AMP html a bit and this line immediately caught my attention.
AMP HTML documents MUST:
Contains a top-level tag <html ⚡>( <html amp>also accepted).
So my first question here is <html ⚡>valid HTML? I mean this works, but I look very strange to me. Can someone tell me specific rules for unicode as HTML attributes?
And my other question: what is it used for. The documentation states that this is necessary for a valid AMP document.
But dropping does not result in an AMP validation error. The JS AMP source alone doesn't even care about that.
Is this a sign for scanners and bots designating a document as AMP?
Thanks in advance.:)