suppress-mutation-events-in-shadow-characterdata.html

<!DOCTYPE html>
<html>
<head>
<script src="../../../../../resources/js-test.js"></script>
</head>
<body>
<div id="host"></div>
<script>
description("Ensures that DOMCharacterDataModified isn't fired inside shadows.");
var fired = false;
var host = document.getElementById("host");
var shadow = host.attachShadow({mode: 'open'});
var div = document.createElement("div");
div.addEventListener("DOMCharacterDataModified", function(evt) {
    fired = true;
}, false);

shadow.appendChild(div);
div.innerHTML = "Hello, ";
div.firstChild.appendData("World!");
shouldBeFalse("fired");
shouldBe("div.innerHTML", "'Hello, World!'");
</script>
</body>
</html>

chromium/third_party/blink/web_tests/dom/mutation-event-tests/fast/dom/shadow/suppress-mutation-events-in-shadow-characterdata.html