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chromium/third_party/blink/web_tests/fast/dom/HTMLElement/iscontenteditable-designmodeon-ancestor.html 

<!DOCTYPE html>
<html>
<head>
<script src="../../../resources/js-test.js"></script>
</head>
<body>
<p id="description"></p>
<div id="console"></div>
<div id="result"></div>
<div id="parent_of_div" contentEditable="false">
    <div id="div"></div>
</div>
<div id="parent_of_div2">
    <div id="div2"></div>
</div>
<div id="parent_of_p" contentEditable="true">
    <p id="p"></p>
</div>
<div id="parent_of_p2">
    <p id="p2"></p>
</div>
<script>
description('isContentEditable should not change if its ancestor\'s contentEditable is set, no matter whether document.designMode is enabled or not.')

document.getElementById("parent_of_div2").contentEditable = false;
document.getElementById("parent_of_p2").contentEditable = true;

evalAndLog('document.designMode = "on"');

shouldBe('document.getElementById("div").contentEditable', '"inherit"');
shouldBe('document.getElementById("div").isContentEditable', 'true');
shouldBe('window.getComputedStyle(div, "").getPropertyValue("-webkit-user-modify")', '"read-only"');

shouldBe('document.getElementById("div2").contentEditable', '"inherit"');
shouldBe('document.getElementById("div2").isContentEditable', 'true');
shouldBe('window.getComputedStyle(div2, "").getPropertyValue("-webkit-user-modify")', '"read-only"');

shouldBe('document.getElementById("p").contentEditable', '"inherit"');
shouldBe('document.getElementById("p").isContentEditable', 'true');
shouldBe('window.getComputedStyle(p, "").getPropertyValue("-webkit-user-modify")', '"read-write"');

shouldBe('document.getElementById("p2").contentEditable', '"inherit"');
shouldBe('document.getElementById("p2").isContentEditable', 'true');
shouldBe('window.getComputedStyle(p2, "").getPropertyValue("-webkit-user-modify")', '"read-write"');

document.getElementById("parent_of_div").style.display= 'none';
document.getElementById("parent_of_div2").style.display= 'none';
document.getElementById("parent_of_p").style.display= 'none';
document.getElementById("parent_of_p2").style.display= 'none';
</script>
</body>
</html>