On 2020/01/09 3:35, James Graham wrote:
On 08/01/2020 09:54, Masayuki Nakano wrote:
Summary: "beforeinput" event is useful for web apps which manage input
data into `<input>`, `<textarea>` and/or `contenteditable`. This event
is fired before our editor modifies value or DOM tree and some types
are cancelable. Therefore, if some user inputs are not acceptable for
the web app, they can cancel it, and/or modifies the value or the DOM
tree as they want.
Bugzilla: https://bugzilla.mozilla.org/show_bug.cgi?id=970802
Standard: https://w3c.github.io/uievents/#event-type-beforeinput
Platform coverage: all
Preference: dom.input_events.beforeinput.enabled (false by default for
now)
DevTools bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1607686
Are there wpt tests for this feature?
Unfortunately, it's tested only in simple cases:
https://searchfox.org/mozilla-central/search?q=beforeinput&case=false®exp=false&path=web-platform
The reason is, "beforeinput" event is fired when browser's built-in
editor modifies the DOM, however, most of them the cases are caused by
browser specific shortcut keys, DnD, autocomplete, spellchecker, etc.
Therefore, most of them are tested by mochitest.
What's the implementation status
in other browsers?
Blink and WebKit implemented it:
Blink:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/W-Q1yWW-zas
WebKit: https://bugs.webkit.org/show_bug.cgi?id=163021
Except EdgeHTML, Gecko is the last one which does not support
"beforeinput" event.
And also I forgot to write links to Input Events:
Level 1: https://rawgit.com/w3c/input-events/v1/index.html
Level 2: https://w3c.github.io/input-events/
We keep supporting Level 1 for now since Level 2 has some backward
compatibility concerns:
https://github.com/w3c/input-events/issues/87
https://github.com/w3c/input-events/issues/86
(Chrome supports Level 1, Safari supports Level 2 partially.)
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