Bug 251592

Summary:	REGRESSION (Safari 16.3): Incorrect rendering of nested iframes with document.write
Product:	WebKit	Reporter:	Matthieu Wipliez <matthieu.wipliez>
Component:	Frames	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED CONFIGURATION CHANGED
Severity:	Critical	CC:	rniwa, simon.fraser, webkit-bug-importer
Priority:	P2	Keywords:	InRadar
Version:	Safari 16
Hardware:	All
OS:	iOS 16
See Also:	https://bugs.webkit.org/show_bug.cgi?id=251595

Description Matthieu Wipliez 2023-02-02 08:35:25 PST

The issue is that nested iframes with depth > 2 and not rendered correctly on Safari 16.3
This appears to be only broken on Safari 16.3, not previous or next versions (Safari Technology Preview seems unaffected).

Steps to reproduce :
Go to the URL: https://sample.teads.net/demo/bugs/safari-16.3-nested-iframe.html
Scroll down to the red rectangle
Observe that you see "hey there 0" and "hey there 1".

Expected: "hey there 0", "hey there 1", "hey there 2", "hey there 3".
Open the page on a previous version of Safari (16.1) or Safari Technology Preview, or Firefox, or Chrome, and witness the expected behavior.

Comment 1 Radar WebKit Bug Importer 2023-02-06 15:51:20 PST

<rdar://problem/105102959>

Comment 2 Alexey Proskuryakov 2023-02-23 13:24:35 PST

This does appear to be fixed already. You can also try with macOS 13.3 beta, or Safari 16.4 beta to double check.