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<!DOCTYPE html>
<title>Example of defining a macro that autoloads an extension</title>
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| This page shows how to define macros that autoloads an extension
| where those macros are implemented.
| The \cancel, \bcancel, \xcancel, and \cancelto macros are
| all defined within the cancel extension, so we tie these
| macros to the function that loads an extension, passing it
| the name of the extension to load.
<script type="text/x-mathjax-config">
MathJax.Hub.Register.StartupHook("TeX Jax Ready",function () {
cancel: ["Extension","cancel"],
bcancel: ["Extension","cancel"],
xcancel: ["Extension","cancel"],
cancelto: ["Extension","cancel"]
<script type="text/javascript" src="../MathJax.js?config=TeX-AMS_HTML-full"></script>
This page makes <code>\cancel</code>, <code>\bcancel</code>,
<code>\xcancel</code>, and <code>\cancelto</code> all be defined so that
they will load the <code>cancel.js</code> extension when first used.
Here is the first usage: \(\cancel{x+1}\). It will cause the cancel
package to be loaded automatically.