The autoload extension predefines all the macros from the extensions that haven’t been loaded already so that they automatically load the needed extension when they are first used, with the exception of the physics package, since it redefines standard macros, and the ams package, due to the large number of macros it contains.

The autoload extension is loaded in all the components that include the TeX input jax, other than input/tex-base. That means that the TeX input jax essentially has access to all the extensions, even if they aren’t loaded initially, and you should never have to use \require or load other extensions (except physics) explicitly unless you want to.

You can control which extensions autoload will load using the autoload object in the tex block of your MathJax configuration. This object contains key: value pairs where the key is the name of an extension, and value is an array listing the macro names that cause that extension to be loaded. If environments can also cause the extension to be loaded, value is an array consisting of two sub-arrays, the first being the names of the macros that cause the extension to autoload, and the second being the names of the environments that cause the extension to be loaded.

For example,

window.MathJax = {
tex: {
verb: ['verb']
}
}
};


says that the \verb command should load the verb extension when it is first used.

If the array is empty, then that extension will not be loaded, so to prevent autoload from loading an extension, assign it the empty array. E.g.,

window.MathJax = {
tex: {
verb: []
}
}
};


says that the verb extension will not be autoloaded.

Note

The autoload extension defines \color to be the one from the color extension (the LaTeX-compatible one rather than the non-standard MathJax version). If you wish to use the non-standard version-2 \color macro from the colorV2 extension instead, use the following:

window.MathJax = {
tex: {