test_text_update.html

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<!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>