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diff --git a/testing/web-platform/tests/mathml/presentation-markup/fractions/frac-created-dynamically-4.html b/testing/web-platform/tests/mathml/presentation-markup/fractions/frac-created-dynamically-4.html
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+++ b/testing/web-platform/tests/mathml/presentation-markup/fractions/frac-created-dynamically-4.html
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+<!DOCTYPE html>
+<html class="reftest-wait">
+ <head>
+ <title>mfrac childnode update</title>
+ <link rel="help" href="https://w3c.github.io/mathml-core/#fractions-mfrac">
+ <meta name="assert" content="A dynamically created mfrac should render like the equivalent markup.">
+ <link rel="match" href="frac-created-dynamically-4-ref.html">
+ <script type="text/javascript">
+ function doTest() {
+ var x = document.getElementById("innerMfrac");
+ var y = document.createElementNS("http://www.w3.org/1998/Math/MathML","mi");
+ var z = document.createElementNS("http://www.w3.org/1998/Math/MathML","mi");
+ y.innerHTML = "c";
+ z.innerHTML = "d";
+ x.appendChild(y);
+ x.appendChild(z);
+ document.documentElement.removeAttribute("class");
+ }
+ window.addEventListener("TestRendered",doTest);
+ </script>
+ </head>
+ <body>
+ <math>
+ <mfrac style="font-size: 300%">
+ <mfrac>
+ <mi>a</mi>
+ <mi>b</mi>
+ </mfrac>
+ <mfrac id="innerMfrac">
+ </mfrac>
+ </mfrac>
+ </math>
+ </body>
+</html>