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dfreedm avatar dfreedm commented on June 21, 2024

Ah, this looks like a native Custom Elements vs polyfill ShadowDOM issue.

In M33, we need chrome://flags/#enable-experimental-web-platform-features and chrome://flags/#enable-javascript-harmony turned on for now.

With those flags on, your demos work as expected.

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dfreedm avatar dfreedm commented on June 21, 2024

I've been looking at this bug just now, and I think the main issue is that the targetFinding code for the touches can accidentally return an element instead of Document or ShadowRoot if the element gets disconnected from the DOM.
This issue only seems to manifest in the ShadowDOM Polyfill probably due to some quirk in the overriding of parentNode. Making sure a valid root is returned from this.owner seems to fix this.

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