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fix: don't set idl on custom elements that are interested in the corresponding content attribute #4478

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5 changes: 5 additions & 0 deletions src/diff/props.js
Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,11 @@ export function setProperty(dom, name, value, oldValue, namespace) {
name != 'colSpan' &&
name != 'role' &&
name != 'popover' &&
// observedAttributes can exist as a static property on custom elements
// a runtime check here has no tangible benefit apart from satisfying typescript
// which runs later in the toolchain
// @ts-ignore
!dom.constructor.observedAttributes?.includes(name) &&
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name in dom
) {
try {
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