<head>
<script>
var observer = new MutationObserver(function(mutations) {
    function foo() {
        throw "Exception to trigger unwinding in MutationObserver";
    }
    mutations.forEach(function(mutation) {
        foo();
    });
});

function test()
{
    if (window.testRunner)
        testRunner.dumpAsText();

    var node = document.getElementById('res');
    var config = { attribute: true, childList: true, characterData: true };
    observer.observe(node, config);

    node.innerText += "Mutate that node";
    throw "Pending exception before MutationObservers are called.";
}
</script>
</head>
<body onload="test();">
<p>Regression test for https://webkit.org/b/131530. This test should not crash.<form>
<div id="res"></div>
</body>