We shipped high-precision coordinates, i.e., fractional coordinates, of
PointerEvents in Nightly builds.
Summary: `|screenX|`, `screenY`, `clientX`, `clientY`, `pageX`, `pageY`,
`offsetX` and `offsetY` of DOM events are now changed from `long` to
`double`. And these values may be fractional values if the event is a
`PointerEvent` whose type is NOT `click`, `auxclick` nor `contextmenu`.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1680669
Specification: CSS OM
<https://drafts.csswg.org/cssom-view/#extensions-to-the-mouseevent-interface>
and PointerEvents <https://w3c.github.io/pointerevents/#event-coordinates>
Platform coverage: All
Preference: `dom.event.pointer.fractional_coordinates.enabled`
DevTools bug: N/A
Other browsers: Chrome already supports this. Safari seems supporting it
only for trusted events and only in preview builds.
web-platform-tests: trusted:
<https://wpt.fyi/results/pointerevents/pointerevent_fractional_coordinates.html%3Fmouse?label=experimental&label=master&aligned
<https://wpt.fyi/results/pointerevents/pointerevent_fractional_coordinates.html%3Fmouse?label=experimental&label=master&aligned>>,
untrusted:
<https://wpt.fyi/results/pointerevents/pointerevent_fractional_coordinates_untrusted.html?label=experimental&label=master&aligned
<https://wpt.fyi/results/pointerevents/pointerevent_fractional_coordinates_untrusted.html?label=experimental&label=master&aligned>>
--
Masayuki Nakano<masay...@d-toybox.com>
Working on DOM, Events, editor and IME handling for Gecko
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