Summary:
A closedby attribute that can be used to control the light dismiss behavior of
`<dialog>` elements:
`<dialog closedby=none>` - no user-triggered closing of dialogs at all.
`<dialog closedby=closerequest>` - user pressing ESC (or other close
trigger) closes the dialog
`<dialog closedby=any>` - user clicking outside the dialog, or pressing
ESC, closes the dialog. Akin to popover=auto behavior.
`<dialog>` - i.e. no closedby attribute - default/old behavior. Behaves
like closedby=closerequest for modal dialogs, and closedby=none for modeless
dialogs.
Bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=1936940
Specification:
https://github.com/whatwg/html/pull/10737
Standards Body:
WHATWG
Platform coverage:
all.
Preference:
dom.dialog.light-dismiss.enabled
DevTools bug:
n/a.
Link to standards-positions discussion:
https://github.com/mozilla/standards-positions/issues/998
Other browsers:
Blink: Prototyping.
WebKit: No Signals.
web-platform-tests:
https://wpt.fyi/results/html/semantics/interactive-elements/the-dialog-element?label=master&label=experimental&aligned&q=closedby
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