Stop re-signaling a slotchange event.

Category: DOM
Type: New or changed feature
Status: Enabled by default (Chrome 56)
Intent stage: None

Summary

The spec change: https://github.com/whatwg/dom/pull/353 (PR to DOM Standard) Blink no longer re-fires a slotchange event at a slot's assignedSlot (or parent slot). See https://github.com/w3c/webcomponents/issues/571 for details.

Standards & signals

Specification: https://dom.spec.whatwg.org/
Firefox: No signal
Safari: In development
Web developers: No signals
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=660777

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