[Webkit-unassigned] [Bug 270736] New: 3rd level iframe does not fire load event

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=270736

            Bug ID: 270736
           Summary: 3rd level iframe does not fire load event
           Product: WebKit
           Version: Safari 17
          Hardware: Mac (Apple Silicon)
                OS: macOS 14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: vojacem at gmail.com

3rd level iframe behaves differently than others.

Load events of iframe1 and iframe2 fire normally, iframe3 load event does not.

Steps to reproduce:
1. Open `about:blank`
2. Run following code
      (async () => {
        const iframe1 = document.createElement("iframe");
        iframe1.setAttribute("srcdoc", "");
        document.body.append(iframe1);
        await new Promise((resolve) =>
          iframe1.addEventListener("load", resolve, { once: true })
        );

        const iframe2 = document.createElement("iframe");
        iframe2.setAttribute("srcdoc", "");
        iframe1.contentDocument.body.append(iframe2);
        await new Promise((resolve) =>
          iframe2.addEventListener("load", resolve, { once: true })
        );

        const iframe3 = document.createElement("iframe");
        iframe3.setAttribute("srcdoc", "");
        iframe2.contentDocument.body.append(iframe3);
        await new Promise((resolve) =>
          iframe3.addEventListener("load", resolve, { once: true })
        );
        console.log("loaded");
      })();

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20240309/137f1112/attachment-0001.htm>