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conformance · v133

v133 · fix-mouse-focus-for-slotted-elements-in-shadow-dom — conformance probe

5 assertions drawn from the spec. Each is a single contract the spec text makes. Pass/fail reflects what this browser executed; blocked means the contract was not run because it needs user mediation, hardware, or another unavailable precondition. Open the page in Chrome stable / canary / Firefox / Safari to compare.

browser: spec: https://dom.spec.whatwg.org/#concept-event-dispatch chromestatus: #5203351732748288 generated 2026-06-01T08:12:59Z by conformance-author-v1-subagent
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id contract kind verdict detail
attachshadow-supported Element.prototype.attachShadow exists; shadow DOM is the substrate for the slotting fix. typeof
slot-element-supported HTMLSlotElement is exposed and hosts the slotting machinery. exists
slotted-element-receives-programmatic-focus A focusable element distributed into a slot can receive programmatic focus (the focus delegates to the shadow host). spec ↗ script
shadowroot-activeelement-reflects-focused ShadowRoot.activeElement reports the focused element inside the shadow tree. script
click-event-on-slotted-still-fires A synthetic click on a slotted element still fires the click event (regression-check for the focus-fix's side-effects). script