RFR: JDK-8266856 Make <wbr> element void

[Jonathan Gibbons]

On Tue, 18 May 2021 17:15:56 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review a simple fix to treat `wbr` as a void element.

Since you've written the test, I'll include it, but it does seem like "overkill" for void elements and "inadequate" for other aspects.

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PR: https://git.openjdk.java.net/jdk/pull/4098