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This post shows two ways of displaying a square root with HTML.

**Pure HTML for older browsers.**
The following HTML source

√<span style="text-decoration: overline">2</span>is displayed as

√2Not all browsers display the above equally well, but it is always readable.

**MathML for newer browsers.**
The following HTML source

<math><msqrt><mi>2</mi></msqrt></math>is displayed as

$\sqrt{2}$With MathML being part of HTML5, all modern browsers support MathML. Which is a god-given for those of us who remember the HTML documents that were generated from LaTeX source files by converting formulae to bitmap graphics.

Related reading:

- Displaying math in HTML [mentions MathJax which allows you to use MathML in older browsers]