[Webkit-unassigned] [Bug 251595] New: Incorrect rendering of nested iframes in the absence of src/srcdoc/document.write

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251595

            Bug ID: 251595
           Summary: Incorrect rendering of nested iframes in the absence
                    of src/srcdoc/document.write
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: All
                OS: Unspecified
            Status: NEW
          Severity: Major
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: matthieu.wipliez at teads.com

This seems somewhat related to bug #251592

When creating nested iframes dynamically in JavaScript, only the first 2 iframes are correctly rendered.
It is necessary to use "document.write" to force the iframes to render properly on Safari (expect notably on Safari 16.3 as the aforementioned bug shows).

Steps to reproduce :
Go to the URL: https://sample.teads.net/demo/bugs/safari-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 Firefox or Chrome, and witness the expected behavior.

I'm marking this as "Major" rather than "Critical" only because there is a workaround thanks to document.write.

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