HTMLTemplateElement has been shipped by Chrome and Firefox for a while and the specification has been quite stable at this point: http://www.w3.org/TR/html-templates/ The feature adds the minimum amount of changes to the HTML parser to allow JS libraries to work-around HTML parser quirkiness such as tr being removed outside of table element. We should enable this feature by default.
<rdar://problem/15400836>
Created attachment 218477 [details] Enables the feature
Created attachment 218478 [details] Patch
Comment on attachment 218478 [details] Patch Clearing flags on attachment: 218478 Committed r160156: <http://trac.webkit.org/changeset/160156>
All reviewed patches have been landed. Closing bug.