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32dd59bb9a
Previously these have been unsupported, but in this patch, support is added for the tags so that the HTML Processor can process documents containing them. There was a design discussion about introducing a constant to communicate "any of the H1 - H6 elements" but this posed a number of challenges that don't need to be answered in this patch. For the time being, because the HTML specification treats H1 - H6 specially as a single kind of element, the HTML Processor uses an internal hard-coded string to indicate this. By using a hard-coded string it's possible to avoid introducing a class constant which cannot be made private due to PHP's class design. In the future, this will probably appear as a special constant in a new constant-containing class. Props dmsnell, jonsurrell. Fixes #60060. git-svn-id: https://develop.svn.wordpress.org/trunk@57186 602fd350-edb4-49c9-b593-d223f7449a82