Add move Event #11278
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Add move Event #11278
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frivoal
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Nov 27, 2024
UAs expose the coordinates of a window (window.screenX, window.screenY), enabling authors to track window movement and react to it. Without a corresponding event though, they have to resort to active polling, which is wasteful of resources, especially if done often enough to have a responsive UI. As resolved by the CSSWG (See w3c/csswg-drafts#7693), this adds an onmove event handler to keep track changes in window position without such need for active polling. The definition of the event itself goes to CSSOM-View, along with the geometric attributes whose changes it tracks. The privacy concerns related to exposing the window position in the first place are handled in CSSOM-View, which allows UAs to return fake information. The addition of the event doesn't change that: UAs that don't expose the real information continue not to (and the event won't fire). See explainer at https://github.com/Igalia/explainers/blob/main/onmove-event-handler/README.md CSS Part of the change: w3c/csswg-drafts#11278 Tests: web-platform-tests/wpt#49390 Implemented experimentally in Chrome: https://chromium-review.googlesource.com/c/chromium/src/+/6035050
javifernandez
approved these changes
Nov 27, 2024
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This is the CSS part of #7693. HTML part to be filed separately.
(this replaces #9664, which was trying to do it all in CSS, monkey patching HTML)