I feel even more justified for not being a big fan of JavaScript:https://twitter.com/marcan42/status/1008999468492918784 …
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JS doesn't define H like that, in fact it has a method where you can specify the precision and then it actually will give you all the digits. It's not a limitation, just broken default behavior. But honestly, 754 is extremely vague about character sequences.
It's so vague that on paper, sure, it probably meets it. But my main point is that if the output looks like an integer (no decimal point or 'e') then it's not a text representation of a float at all, but of its integer value, and then you'd better have all the digits.