mathjax
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Beautiful math in all browsers. MathJax is an open-source JavaScript display engine for LaTeX, MathML, and AsciiMath notation that works in all browsers.
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HTML
<html>
<head>
<title>MathJax MathML Test Page</title>
<!-- Copyright (c) 2010-2019 The MathJax Consortium -->
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<script type="text/javascript" src="../MathJax.js?config=MML_HTMLorMML-full"></script>
</head>
<body>
<p>
When
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mi>a</mi><mo>≠</mo><mn>0</mn>
</math>,
there are two solutions to
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mi>a</mi><msup><mi>x</mi><mn>2</mn></msup>
<mo>+</mo> <mi>b</mi><mi>x</mi>
<mo>+</mo> <mi>c</mi> <mo>=</mo> <mn>0</mn>
</math>
and they are
<math xmlns="http://www.w3.org/1998/Math/MathML" display="block">
<mi>x</mi> <mo>=</mo>
<mrow>
<mfrac>
<mrow>
<mo>−</mo>
<mi>b</mi>
<mo>±</mo>
<msqrt>
<msup><mi>b</mi><mn>2</mn></msup>
<mo>−</mo>
<mn>4</mn><mi>a</mi><mi>c</mi>
</msqrt>
</mrow>
<mrow> <mn>2</mn><mi>a</mi> </mrow>
</mfrac>
</mrow>
<mtext>.</mtext>
</math>
</p>
</body>
</html>