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diff --git a/dom/svg/test/test_selectSubString.xhtml b/dom/svg/test/test_selectSubString.xhtml
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+++ b/dom/svg/test/test_selectSubString.xhtml
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+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=398825
+-->
+<head>
+ <title>Test for Bug 398825</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=398825">Mozilla Bug 398825</a>
+<p id="display"></p>
+<div id="content" style="display: none"></div>
+
+<iframe id="svg" src="selectSubString-helper.svg"></iframe>
+
+<pre id="test">
+<script class="testbody" type="application/javascript">
+SimpleTest.waitForExplicitFinish();
+
+function runTests() {
+ var document = $("svg").contentWindow.document;
+ var text = document.getElementById("text");
+
+ function expectThrow(charnum, nchars) {
+ try {
+ text.selectSubString(charnum, nchars);
+ ok(false,
+ "text.selectSubString(" + charnum + "," + nchars + ") " +
+ "should have thrown");
+ } catch (e) {
+ is(e.name, "IndexSizeError",
+ "expected an index error for " +
+ "text.selectSubString(" + charnum + "," + nchars + ")");
+ is(e.code, DOMException.INDEX_SIZE_ERR,
+ "expected an index error for " +
+ "text.selectSubString(" + charnum + "," + nchars + ")");
+ }
+ }
+
+ function expectNoThrow(charnum, nchars, expected) {
+ try {
+ text.selectSubString(charnum, nchars);
+ ok(true,
+ "text.selectSubString(" + charnum + "," + nchars + ") " +
+ "should not have thrown");
+ } catch (e) {
+ ok(false,
+ "unexpected exception for " +
+ "text.selectSubString(" + charnum + "," + nchars + ")");
+ }
+ }
+
+ expectThrow(100, 2);
+ expectThrow(100, 0);
+ expectThrow(3, 0);
+ expectThrow(3, 100);
+ expectThrow(3, 100);
+ expectThrow(100, 100);
+
+ expectNoThrow(1, 100);
+ expectNoThrow(2, 100);
+ expectNoThrow(1, 3);
+ expectNoThrow(0, 4);
+
+ SimpleTest.finish();
+}
+
+window.addEventListener("load", runTests);
+</script>
+</pre>
+</body>
+</html>