Bug 243123

Summary:	Thousands of window.onload events makes Safari hang and page loading slower than other browsers
Product:	WebKit	Reporter:	Ahmad Saleem <ahmad.saleem792>
Component:	Page Loading	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	achristensen, ap, beidson, bfulgham, cdumez, karlcow, rniwa, webkit-bug-importer
Priority:	P2	Keywords:	BrowserCompat, InRadar
Version:	Safari 15
Hardware:	Mac (Apple Silicon)
OS:	macOS 12
URL:	https://bug1542995.bmoattachments.org/attachment.cgi?id=9056867
See Also:	https://bugs.webkit.org/show_bug.cgi?id=244154 https://bugs.webkit.org/show_bug.cgi?id=188499

Description Ahmad Saleem 2022-07-22 17:28:47 PDT

Hi Team,

Thanks for doing good job, while trying to find how other browsers work for window.onload, I came across following test case in Mozilla Bugzilla:

Link - https://bug1542995.bmoattachments.org/attachment.cgi?id=9056867

It causes Safari tab to hang and also it makes interacting with other tabs bit difficult for few seconds and then it also take longer than other browsers (Chrome Canary 105 and Firefox Nightly 104) to load it.

** Steps to Reproduce ***

1. Load Link
2. Notice the page loading speed

EXPECTED RESULT: Page Loading should not be slower than other browsers and it should not hang Safari even in slightest

ACTUAL RESULT: Page Loading is slower and it do hang Safari on few occasion but it does not lead to crash

Looking forward for this bug to get fixed.

Thanks in advance.

Comment 1 Karl Dubost 2022-07-25 00:18:50 PDT

Oh this is a bug I have created on Firefox, which came from a Webcompat issue.
https://bugzilla.mozilla.org/show_bug.cgi?id=1542995 (which should be closed probably)

The bug is based on a recursion limit.

On Firefox windows, the issue was fixed with a stack limit.
https://hg.mozilla.org/releases/mozilla-release/rev/c6f45f6f744d

And this one fixed it for other platforms.
https://bugzilla.mozilla.org/show_bug.cgi?id=1578350

Comment 2 Radar WebKit Bug Importer 2022-07-25 00:20:34 PDT

<rdar://problem/97536058>