Intermittent timeout in /html/semantics/forms/the-button-element/button-submit-children.html

[jdm]

{
    "status": "TIMEOUT", 
    "group": "default", 
    "message": "Test timed out", 
    "stack": null, 
    "subtest": "This test will pass if a form navigation successfully occurs when clicking a child element of a <button type=submit> element with a onclick event handler which prevents the default form submission and manually calls form.submit() instead.", 
    "test": "/html/semantics/forms/the-button-element/button-submit-children.html", 
    "line": 25267, 
    "action": "test_result", 
    "expected": "PASS"
}
{
    "status": "TIMEOUT", 
    "group": "default", 
    "message": null, 
    "stack": null, 
    "subtest": null, 
    "test": "/html/semantics/forms/the-button-element/button-submit-children.html", 
    "line": 25268, 
    "action": "test_result", 
    "expected": "OK"
}