hidden=until-found and details revealing algorithms can loop infinitely

[nt1m]

What is the issue with the HTML Standard?

Given events are emitted in every loop iteration, someone can use these events and keep creating new ancestors to loop through.

I think Chromium works around this by collecting the ancestors into a list and then loop through that list.

cc @emilio @annevk @josepharhar @domenic @jnjaeschke

[jnjaeschke]

Chromium's approach sounds reasonable to avoid a hang.

[josepharhar]

Thanks! I created a PR to fix this: #11457