[Webkit-unassigned] [Bug 273343] New: iframes reloaded repeatedly on developer.mozilla.org pages

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=273343

            Bug ID: 273343
           Summary: iframes reloaded repeatedly on developer.mozilla.org
                    pages
           Product: WebKit
           Version: Safari 17
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Frames
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: opendarwin at lapcatsoftware.com

Created attachment 471171

  --> https://bugs.webkit.org/attachment.cgi?id=471171&action=review

Screen recording with web inspector

I can reproduce this issue with Safari 17.4.1 and Safari Technology Preview 193 on macOS Sonoma and Ventura and iPadOS 17.4.1. I haven't tested any other Safari configurations.

I can't be certain that this is a WebKit bug rather than a Mozilla bug, but it only happens in Safari, not in Chrome or Firefox.

Steps to reproduce:
1) Open https://developer.mozilla.org/en-US/docs/Web/HTML/Element/figure
2) Scroll down the page

Attached are screen recordings demonstrating the issue. In one screen recording, the web inspector is open to the Network tab, and you can see the runner.html iframe getting reloaded repeatedly. Also, this is causing high CPU usage in the Safari Web Content process, around 50%.

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