RfC: An alternative approach to accessibility across shadow boundaries

[rniwa]

Based on some concerns raised by Mozilla during the last F2F, we came up with an alternative declarative approach for solving accessibility use cases across shadow boundaries at WICG/aom#169

[rniwa]

@LJWatson @diervo @leobalter @justinfagnani

[leobalter]

Thanks for the ping, @rniwa! This allowed me to contact @caridy who is already in the loop.

Please, let us know if we can also help with testing it at Salesforce. cc @gregwhitworth.

[Westbrook]

Is this appropriate superseded by https://github.com/WICG/webcomponents/blob/gh-pages/proposals/reference-target-explainer.md?

[Westbrook]

Closing in preference of Reference Target which got ringing endorsements at TPAC this year.