[Webkit-unassigned] [Bug 243127] New: onload load resources in different order from other browsers

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=243127

            Bug ID: 243127
           Summary: onload load resources in different order from other
                    browsers
           Product: WebKit
           Version: Safari 15
          Hardware: Mac (Apple Silicon)
                OS: macOS 12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Page Loading
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zlip.792 at gmail.com
                CC: beidson at apple.com

Hi Team,

Once again, I was deep diving into Mozilla Bugzilla for onload test cases and noted another bug, where the loading event sequences is different in Safari compared to other browsers (Chrome Canary 105 and Firefox Nightly 104).

NOTE - All of these testing across browsers is done in Private / Incognito to avoid any cache issues in loading.

*** STEPS TO REPRODUCE ***

1. Load following test case URL - https://bug517987.bmoattachments.org/attachment.cgi?id=401942

ACTUAL RESULT:

Frame sequence is -> window, image, image, window

EXPECTED RESULT:

Frame sequence should be like other browsers -> image, window, image, window

_______

Sample Output from Chrome Canary 105:

Image onload, frame-one
Window onload, frame-one
Image onload, frame-two
Window onload, frame-two

Sample Output from Safari 15.6 on macOS 12.5:

Window onload, frame-two
Image onload, frame-one
Image onload, frame-two
Window onload, frame-one

I am not sure on spec but I think we should match our frame loading sequence with other browsers.

If it is not a bug, then please mark it accordingly. Thanks!

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