Summary: Currently, Gecko may retarget each touch to an element which is
near the touch point and has some touch event listeners. However, once
we conform to new spec for considering `click` event target
<https://bugzilla.mozilla.org/show_bug.cgi?id=1885232>, Android users
may hard to tap clickable element if surrounding element has touch
listeners. Therefore, when the touch is first touch, Gecko starts to
retarget the `pointerdown` and `touchstart` event target to clickable
element too.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1957321
Specification: N/A
Platform coverage: Android (desktop users can enable the feature with
`|ui.touch.radius.enabled|` pref)
Preference: |ui.touch.radius.single_touch.treat_clickable_as_touchable|
DevTools bug: N/A
Other browsers: Blink has similar heuristic feature, but I don't know
the details. I don't know about WebKit.
web-platform-tests: N/A (but we have a mochitest
<https://searchfox.org/mozilla-central/source/layout/base/tests/test_event_target_radius.html>)
--
Masayuki Nakano<masay...@d-toybox.com>
Working on DOM, Events, editor and IME handling for Gecko
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