Re: [whatwg/dom] Allow more characters in element/attribute names and prefixes (PR #1079)

zcorpan left a comment (whatwg/dom#1079)

I don't have a link to previous discussion, but a quick note:

> My general concern is that allowing `<` would seem to cause trouble for things that are scanning for dangerous strings. E.g. `<<script>` is now an element with tagname `<script`.

The first character needs to be ASCII alpha. But `<x<script>` would have tagname `x<script`, which matches the HTML parser.

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