Frederik Braun 6eac45b147 Bug 1644070 - add missing URLish attributes to TreeSanitizer r=hsivonen ... This adds the elements `formaction`, `data`, `ping`, `poster`. We can't really add a test for the `<object data>`, since we never allow `<object>` elements in the first place and we don't allow settings exceptions for temporarily allowed elements. Same for `poster` elements, since it's only used in media elements and those are either all allowed or none. Differential Revision: https://phabricator.services.mozilla.com/D78638		2020-06-10 07:24:05 +00:00
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