in content/references/java-chassis/1.x/gitbook/gitbook-plugin-fontsettings/fontsettings.js [123:130]
function getFontFamilyId(configName) {
// Search for plugin configured font family
var configFamily = $.grep(FAMILIES, function(family) {
return family.config == configName;
})[0];
// Fallback to default font family
return (!!configFamily)? configFamily.id : 0;
}