# CommonHTML Output Processor Options¶

The options below control the operation of the CommonHTML output processor that is run when you include 'output/chtml' in the load array of the loader block of your MathJax configuration, or if you load a combined component that includes the CommonHTML output jax. They are listed with their default values. To set any of these options, include a chtml section in your MathJax global object.

## The Configuration Block¶

MathJax = {
chtml: {
scale: 1,                      // global scaling factor for all expressions
minScale: .5,                  // smallest scaling factor to use
matchFontHeight: true,         // true to match ex-height of surrounding font
mtextInheritFont: false,       // true to make mtext elements use surrounding font
merrorInheritFont: true,       // true to make merror text use surrounding font
mathmlSpacing: false,          // true for MathML spacing rules, false for TeX rules
skipAttributes: {},            // RFDa and other attributes NOT to copy to the output
exFactor: .5,                  // default size of ex in em units
displayAlign: 'center',        // default for indentalign when set to 'auto'
displayIndent: '0',            // default for indentshift when set to 'auto'
fontURL: '[mathjax]/components/output/chtml/fonts/woff-v2',   // The URL where the fonts are found
adaptiveCSS: true              // true means only produce CSS that is used in the processed equations
}
};


## Option Descriptions¶

fontURL: '[mathjax]/components/output/chtml/fonts/woff-v2'

This is the URL to the location where the MathJax fonts are stored. In the default, [mathjax] is replaced by the location from which you have loaded MathJax. You should include a complete URL to the location of the fonts you want to use.

adaptiveCSS: true

This setting controls how the CommonHTML output jax handles the CSS styles that it generates. When true, this means that only the CSS needed for the math that has been processed on the page so far is generated. When false, the CSS needed for all elements and all characters in the MathJax font are generated. This is an extremely large amount of CSS, and that can have an effect on the performance of your page, so it is best to leave this as true. You can reset the information about what CSS is needed by using the command

MathJax.startup.document.output.clearCache();


to clear the font cache.

The remaining options are described in the Options Common to All Output Processors section.