[Webkit-unassigned] [Bug 195671] New: [WPE][GTK] New WPT iframe sandbox tests failing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=195671

            Bug ID: 195671
           Summary: [WPE][GTK] New WPT iframe sandbox tests failing
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKitGTK
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com
                CC: bugs-noreply at webkitgtk.org

imported/w3c/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_allow_downloads_without_user_activation.sub.tentative.html
imported/w3c/web-platform-tests/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_navigation_download_block_downloads_without_user_activation.sub.tentative.html

Probable cause:

There seems to be a problem accessing iframes within the test runner. The first of these tests actually pass in the minibrowser, whereas in the test runner `anchor` is undefined, making an unexpected failure:

var iframe = document.createElement("iframe");
iframe.srcdoc = "<a>Download</a>";
iframe.sandbox = "allow-same-origin allow-downloads-without-user-activation";
iframe.onload = t.step_func(function () {
    iframe.contentWindow.addEventListener(
        "unload", t.unreached_func("Unexpected navigation."));
    var anchor = iframe.contentDocument.getElementsByTagName('a')[0];
    // Set |finish-delay| to let the server stream a response over a  period
    // of time, so it's able to catch potential download cancellation by
    // detecting a socket close.
    anchor.href = "support/download_stash.py?token=" + token + "&finish-delay=" + StreamDownloadFinishDelay();
    anchor.click();
    AssertDownloadSuccess(t, token, StreamDownloadFinishDelay() + DownloadVerifyDelay());
});

document.body.appendChild(iframe);

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