Remove api.CustomElementRegistry.define.disabledFeatures_static_property from BCD

[queengooborg]

This PR removes the define.disabledFeatures_static_property member of the CustomElementRegistry API from BCD. I cannot figure out what this feature is referring to, and have not been able to put together a working test.

Tests Used: https://mdn-bcd-collector.gooborg.com/tests/api/CustomElementRegistry/define/disabledFeatures_static_property

[Elchi3]

@wbamberg removed the docs for it in mdn/content#29317. It was first introduced in mdn/content#8228.

Will, should we remove the BCD as the content doesn't talk about this feature anymore (and I assume the content was removed purposefully)?

[wbamberg]

@wbamberg removed the docs for it in mdn/content#29317. It was first introduced in mdn/content#8228.

Will, should we remove the BCD as the content doesn't talk about this feature anymore (and I assume the content was removed purposefully)?

The old page for define() had some quite complex examples that I simplified in mdn/content#29317, but it looks like I inadvertently removed this example as well. But it should probably be in https://developer.mozilla.org/en-US/docs/Web/API/Element/attachShadow instead, right?

What happens, I think, is that if your element has a static disabledFeatures property, and it is an array containing "shadow", then https://developer.mozilla.org/en-US/docs/Web/API/Element/attachShadow will throw. I've checked this in Firefox and Chrome.

It is in the spec at: https://html.spec.whatwg.org/multipage/custom-elements.html#element-definition.

[Elchi3]

Thanks @wbamberg!
I think we should move this under api.Element.attachShadow.disabledFeatures_static_property then.

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