chromium/third_party/blink/web_tests/external/wpt/uievents/interface/README.md

Interface tests
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These test that the basic UI Events interfaces exist, specifically:

1. Does the interface exist
2. Are all the members defined on the interface accounted for:
 * UIEvent
 * MouseEvent
 * FocusEvent
 * KeyboardEvent
 * WheelEvent
 * CompositionEvent