I didn't found the .emu
file in the https://github.com/tc39/ecma262
The format is “ecmarkup”, but while I’d prefer it come from a file marked .emu, the ecmarkup for the spec is in “spec.html”.
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Oh sorry I didn't mention that, I thought the html file is a pure html file
That a file named ".html" would be pure HTML is a quite reasonable assumption to make; unfortunately it's a decision made long ago that's unlikely to be worth changing.