Closing tag names include trailing whitespace

The following HTML/Marko doesn't parse because the closeTagName is parsed with whitespace and so the open and close tag names don't match.

<span class="dolorum atque aspernatur"
  >Est molestiae sunt facilis qui rem.</span
>

<span class="dolorum atque aspernatur"
  >Est molestiae sunt facilis qui rem.</span
                                        ^^^^ 
       The closing "span\n" tag does not match the corresponding opening "span" tag.
>

I would expect the closeTagName to be "span" and the closeTagEnd to be "\n>"... But I don't know if that makes sense. Alternatively, we consume and discard the whitespace between closeTagName and closeTagEnd. I also don't know how this change would impact upstream dependencies.

Start by locating the parser logic for closeTagName and closeTagEnd, then reproduce the HTML/Marko example from the issue to inspect how whitespace is included in the closing name. Decide whether the name should exclude the whitespace or whether the parser should discard it, and verify that the closing span matches the opening tag without breaking related parsing behavior.