Summary: This is basically an after the fact notification that we're in progress of implementing Custom Elements (both autonomous custom elements and customized built-in elements) and the implementation for old spec, which was never exposed to the web, will be removed. We are close to finishing the implementation, but there are still some performance works before shipping the feature. We plan to enable it *only* on Nightly first to get more feedback from users. (there will be a intent-to-ship before shipping the feature)
Tracking bug: https://bugzilla.mozilla.org/show_bug.cgi?id=889230 Spec: https://html.spec.whatwg.org/multipage/custom-elements.html Estimated target release: 59 Preference behind which this will be implemented: dom.webcomponents.customelements.enabled DevTools support: TBD Support by other browser engines: - Blink: Partial support; supports "Autonomous custom elements" but not "Customized built-in elements" [1] - Edge: Under consideration [2] - Webkit: Partial support; supports "Autonomous custom elements" but not "Customized built-in elements" [3] Testing: We have web-platform tests for this; https://w3c-test.org/custom-elements/ BR, Edgar Chen [1] The customized built-in elements for Blink is under development; https://bugs.chromium.org/p/chromium/issues/detail?id=648828&desc=4 [2] https://developer.microsoft.com/en-us/microsoft-edge/platform/status/customelements/ [3] Safari has indicated that they will not implement customized built-in elements; https://github.com/w3c/webcomponents/issues/544#issuecomment-239301184 _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
