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<!DOCTYPE HTML>
<html>
<body>
<script src="../fast/js/resources/js-test-pre.js"></script>
<canvas id="canvas" tabindex="-1"></canvas>
<div id="console"></div>
<script>
description("This test makes sure that AccessibilityNodeObjects are properly detached when the node they point to is deleted.");
if (window.testRunner && window.accessibilityController) {
window.testRunner.dumpAsText();
// Create an ordinary button on the page, focus it and get its accessibility role.
var button = document.createElement('button');
document.body.appendChild(button);
button.focus();
window.axElement = accessibilityController.focusedElement;
window.expectedButtonRole = axElement.role;
// Now remove the node from the tree and get the role of the detached accessibility object.
document.body.removeChild(button);
window.expectedDetachedRole = axElement.role;
shouldBeTrue("expectedButtonRole != expectedDetachedRole");
// This time create a button that's a child of a canvas element. It will be focusable but not rendered.
// In particular, this will create an AccessibilityNodeObject rather than an AccessibilityRenderObject.
var canvas = document.getElementById('canvas');
(function() {
var button = document.createElement('button');
canvas.appendChild(button);
// Note: focusing the button and using that to get its accessibility object creates an extra
// reference to the button and it won't get deleted when we want it to. So instead we focus the
// canvas and get its first child.
canvas.focus();
window.axElement = accessibilityController.focusedElement.childAtIndex(0);
window.canvasButtonRole = axElement.role;
shouldBe("canvasButtonRole", "expectedButtonRole");
// Now delete the node.
canvas.removeChild(button);
})();
// Explicitly run garbage collection now; since there are no more references to the button,
// the node will be destroyed.
gc();
// Ensure that the accessibility object is detached by checking its role.
window.detachedCanvasButtonRole = axElement.role;
shouldBe("detachedCanvasButtonRole", "expectedDetachedRole");
}
</script>
<script src="../fast/js/resources/js-test-post.js"></script>
</body>
</html>
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