gecko-dev/dom/svg/test/test_text_update.html

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HTML

<!DOCTYPE html>
<title>Test for Bug 876831</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css">
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=876831">Mozilla Bug 876831</a>
<p id="display"</p>
<!--
Test that the frame tree will be reflowed after a DOM mutation
and just before an SVG DOM method does its work.
-->
<svg>
<text>ab</text>
</svg>
<pre id="test">
<script class="testbody" type="application/javascript">
var text = document.querySelector("text");
var length = text.getComputedTextLength();
ok(length > 0, "text.getComputedTextLength() > 0");
text.firstChild.nodeValue += "cd";
ok(text.getComputedTextLength() > length, "text.getComputedTextLength() changes directly after DOM mutation");
text.firstChild.remove();
is(text.getComputedTextLength(), 0, "text.getComputedTextLength() == 0 after removing child");
</script>
</pre>