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+<!DOCTYPE HTML>
+<title>The textLengh IDL attribute</title>
+<meta content="charset=utf-16">
+<link rel="author" title="tigercosmos" href="mailto:phy.tiger@gmail.com">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#dom-textarea-textlength">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<textarea id="textarea"></textarea>
+<script>
+ var textarea = document.getElementById("textarea");
+
+ test(function () {
+ textarea.value= "Hello, World!";
+ assert_equals(textarea.textLength, 13);
+
+ textarea.value = "\u4f60\u597d\uff0c\u4e16\u754c\uff01"; //你好,世界!
+ assert_equals(textarea.textLength, 6);
+ }, "Textarea's 'testLength' should work for utf-16.");
+</script> \ No newline at end of file