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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=585978
+-->
+<head>
+ <title>Test for Bug 585978</title>
+ <script src="/tests/SimpleTest/SimpleTest.js"></script>
+ <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=585978">Mozilla Bug 585978</a>
+
+<script type="application/javascript">
+
+/* Test that if we have a unicode character in the middle of an ascii string,
+ the unicode character survives translation into and out of a text node. */
+
+for (let i = 0; i < 128; i++) {
+ let node = document.createTextNode('');
+ let str = '';
+ for (let j = 0; j < i; j++) {
+ str += 'a';
+ }
+ str += '\uA0A9'
+ node.data = str;
+
+ for (let j = 0; j < 32; j++) {
+ is(node.data, str);
+
+ str += 'b';
+ node.appendData('b');
+ }
+}
+
+</script>
+</body>
+</html>