check_templates: Parse '<foo/>' tags better.
check_templates: Parse '<foo/>' tags better.

If folks put something like '<br/>' in the HTML,
we would think the tag's name was "br/" instead
of "br".  I think we were assuming most folks
would write either "<br>" or <br />".

ASIDE:

We should probably have a consistent
preference among these styles:

    * <br>
    * <br/>
    * <br />

I prefer the first.

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