platform/mac/accessibility/content-editable.html

<html>
<script>
    if (window.testRunner)
        testRunner.dumpAsText();
</script>
<body id="body" contenteditable>
 
    <!-- this test should show that the iframe has a writable AXValue because it has a 
         contenteditable attribute -->

    Text
    
    <div id="result"></div>

     
    <script>
        if (window.accessibilityController) {
            var result = document.getElementById("result");

            var body = document.getElementById("body");
            body.focus();
            body = accessibilityController.focusedElement;
            
            result.innerText += "Is settable: "  + body.isAttributeSettable("AXValue") + "\n\n";
        }
    </script>
</body>
</html>