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conformance · v148

v148 · correctly-set-dropeffect-for-dragenter-dragleave-and-dragover-events — 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://html.spec.whatwg.org/multipage/dnd.html#dndevents chromestatus: #6325617459068928 generated 2026-06-01T08:14:38Z by conformance-author-v1-subagent
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pass
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fail
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id contract kind verdict detail
datatransfer-exists DataTransfer is the interface exposing dropEffect. spec ↗ exists
drop-effect-default-none A freshly constructed DataTransfer reports dropEffect='none' per spec. spec ↗ script
effect-allowed-default-none A freshly constructed DataTransfer reports effectAllowed='none'. spec ↗ script
drag-events-constructible DragEvent can be constructed from script and exposes a dataTransfer property. spec ↗ script
drop-effect-setter-clamps Setting dropEffect to an invalid value leaves the current value unchanged (clamping behaviour). spec ↗ script