Dave Townsend fd8d6b1590 Bug 1480465: Infer the namespace for custom elements at definition time by following the class hierarchy. r=smaug
When a custom element is defined we can check whether its class is an instance
of XULElement or HTMLElement and tag the defintion with a namespace accordingly.
This allows us to know the correct namespace for the custom element when
created.

Differential Revision: https://phabricator.services.mozilla.com/D2680

--HG--
extra : moz-landing-system : lando
2018-08-15 10:31:16 +00:00
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