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# The MMLorHTML configuration options

The options below control the operation of the MMLorHTML configuration file that is run when you include `"MMLorHTML.js"` in the config array of your configuration. They are listed with their default values. To set any of these options, include a `MMLorHTML` section in your `MathJax.Hub.Config()` call. For example

    MathJax.Hub.Config({
      MMLorHTML: {
        prefer: {
          Opera: "MML"
        }
      }
    });

would set the `prefer` option so that Opera browser would prefer MathML to HTML-CSS output (while leaving the settings for other browsers unchanged).

Note that if you use the `MMLorHTML.js` configuration file, you should not specify an output processor in the jax array of your configuration; MMLorHTML will fill that in for you.

`prefer: { MSIE: "MML", Firefox: "MML", Opera: "HTML", other: "HTML" }`

  This lets you set the preferred renderer on a browser-by-browser basis. You set the browser to either `"MML"` or `"HTML"` depending on whether you want to use the NativeMML or HTML-CSS output processor. Note that although Opera does process some MathML natively, its support is not sufficient to handle the more complicated output generated by MathJax, so its setting is `"HTML"` by default.

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