1575160 - blur event isn't fired when document is hidden

Status: NEW

(Core :: DOM: UI Events & Focus Handling, defect, P3)

Description

[Makoto Kato [:m_kato]]

Sample: https://jsfiddle.net/4jvnom5e/

When debugging bug 1574596, I found that blur event isn't fired on focused element when visibility is changed. Blink fires blur event, but Gecko doesn't. Should we fire blur event?

Step

1. Open https://jsfiddle.net/4jvnom5e/
2. Set focus to content editable
3. wait 5s

Result

Gecko doesn't fire blur event. But Blink fires blur event.

Comment 1

[Henri Sivonen (:hsivonen)]

If Blink fires it, we probably should, but not sure what the specs say.

Comment 2

[Anne (:annevk)]

See https://github.com/w3c/uievents/issues/236 for a discussion on this. It seems like the outcome there will be to dispatch a blur event, but only at a certain point in time to avoid having to check layout too often.