Move layerX/layerY from UIEvent to MouseEvent #16267
Merged
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These are non-standard properties, but if they are standardized it will
be on MouseEvent, see w3c/uievents#135.
Furthermore, it's only on MouseEvent that these properties ever return
something other than zero.
The apparent removal in Chrome 45 was caused by the move from UIEvent to
MouseEvent in Chromium:
https://bugs.chromium.org/p/chromium/issues/detail?id=503276
Since MouseEvent inherits from UIEvent, we can ignore this prototype
move in BCD, per our guidelines:
https://github.com/mdn/browser-compat-data/blob/main/docs/data-guidelines.md#apis-moved-on-the-prototype-chain