22745 2013-07-21 00:52:31 +0000 [Explainer]: Use case for registering a type extension of an unknown element 2014-01-20 02:47:10 +0000 1 1 1 Unclassified WebAppsWG HISTORICAL - Component Model unspecified PC Linux RESOLVED WONTFIX P2 normal --- 14949 1 dominicc dglazkov renzoe1r public-webapps-bugzilla oldest_to_newest 91045 0 dominicc 2013-07-21 00:52:31 +0000 Here is an interesting use case for the 'extends' attribute: polyfilling a HTML element that is not implemented yet by registering a type extension of an unknown element For example, say a UA implements Custom Elements but not <dialog>. It is neat that Custom Elements can be used to polyfill <dialog> with <dialog is="polyfill-dialog">. This gives polyfills a very smooth upgrade path--they can detect if there's a native HTMLDialogElement and flip to being a no-op. Maybe the Explainer could incorporate this use case; WDYT? 91744 1 dglazkov 2013-08-07 20:45:39 +0000 Sounds good. 98758 2 dominicc 2014-01-20 02:47:10 +0000 I'm going to punt on this. I think it's interesting, but I don't think it's a primary use case.