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wbr element shouldn't be balanced #488

@jcushman

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@jcushman

The <wbr> element is balanced by bleach.clean even though it is an empty element.

Using the list of empty tags from MDN:

In [6]: empty_elements = {
   ...:     'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', 'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr'
   ...: }

In [7]: html = "".join("<%s>" % s for s in empty_elements)

In [8]: import bleach

In [9]: bleach.clean(html, tags=empty_elements)
Out[9]: '<param><source><hr><base><track><area><wbr></wbr><br><img><keygen></keygen><link><input><meta><embed>'

The output includes <wbr></wbr> when it should just be <wbr> like the others. keygen has the same problem, but that's deprecated so I'm not sure if it's worth including.

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