HTML fragment parser creates a token which is only used for <annotation-xml encoding>

[zcorpan]

https://html.spec.whatwg.org/multipage/parsing.html#html-fragment-parsing-algorithm step 9 says

Create a start tag token whose name is the local name of context and whose attributes are the attributes of context.

Let this start tag token be the start tag token of the context node, e.g. for the purposes of determining if it is an HTML integration point.

I tried to find if the fake token here is used anywhere else, but I didn't find anything and so conclude that the HTML integration point check is the only place, which will only check the encoding attribute value if the context node is a MathML annotation-xml element.

I think the "e.g." phrasing suggests that there might be other consumers of the fake token, so at least making the remark say that the HTML integration point check is the only consumer would be good.

[annevk]

I'd like something like:

If the context node is the MathML annotation-xml element, then set its start tag token to a start tag token whose name is annotation-xml and attributes are the context node's attributes.