I'm submitting a ...

• bug report
• feature request
• other

Current behavior:
Web Components aim to be a standards based web framework for browsers very soon. The Custom Elements spec within it is crucial. From Custom Elements Everywhere one can see that AngularJS 1.6 passes all basic tests but none of the advanced tests. This feature request is to provide full support in version 1.7 and pass the advanced tests as well.

Expected / new behavior:
Long term support for 1.7 has been announced to extend for three years. Hence a goal in this request is to make the transition from AngularJS 1.7 to Web Components directly possible, instead of an intermediate step to another framework.

Minimal reproduction of the problem with instructions:

AngularJS version: 1.7.0

Browser: [all]

Anything else: