Bug 125393 – Don't dispatch blur/focus events if the element's page is not focused

• Component: UI Events
• Status: NEW

[Ryosuke Niwa]

Consider merging https://chromium.googlesource.com/chromium/blink/+/60ed87d48e7c337cada58f2ae25da4d9eb426207

When the page loses focus a blur event is dispatched once, prevent a second dispatch (via e.g. programmatic blur()-ing), when a page doesn't have focus, prevent a focus event dispatch (via e.g. programmatic focus()-ing), as it will receive a focus event when the page regains focus.

[Ryosuke Niwa]

Got reverted in http://src.chromium.org/viewvc/blink?view=revision&revision=160140.

But the concept of the change seems correct.

Also see https://code.google.com/p/chromium/issues/detail?id=276757

[Ahmad Saleem]

It landed in this commit:

https://src.chromium.org/viewvc/blink?view=revision&revision=164069

I took a test case from the above and changed it into JSFiddle:

https://jsfiddle.net/8ueL62kx/

*** Firefox Nightly 105 ***

Load test, it would be focused in input field but no event is fired and then click any where besides "input" field, it will fire "blur" event.

*** Chrome Canary 106 ***

Load test, it would be focused in input field but no event is fired and then click any where besides "input" field, it will fire "blurfocus" event.

*** Safari Technology Preview 151 ***

Load test, it would be focused in input field but no event is fired and then click any where besides "input" field, it will fire "blurfocus" event.

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I am not sure on web-spec or whether something else is required but just going to share what I tested or observed. Thanks!

[Radar WebKit Bug Importer]

<rdar://problem/99045743>

[Ahmad Saleem]

I tried to land this change in following PR based Comment 03 - commit of Chromium:

Link - https://github.com/WebKit/WebKit/pull/4774

and these are learnings:

1) Fixing Developer Tools test case is easy and can be followed from Chromium patch without any issue.

2) Someone need to update "TestRunner" - testRunner.focusWebView part to accommodate this change to ensure that the focus work properly since it leads to 77 API failures on iOS:

https://ews-build.webkit.org/#/builders/9/builds/81789

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Since it is beyond my capability to update (2), I will leave it for someone else to fix this bug but will document my attempt for others. Thanks!