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.
Created attachment 217387 [details] Enables the feature
Committed r159550: <http://trac.webkit.org/changeset/159550>
You forgot to update js/dom/global-constructors-attributes.html Doing so now.
Hopefully fixed in r159574
(In reply to comment #3) > You forgot to update js/dom/global-constructors-attributes.html > Doing so now. Oops, thanks for fixing that. Updated the forgotten build-webkit in http://trac.webkit.org/changeset/159664.