Name of system font to use for the main font. fontsize Font size (e.g., 12pt). section-numbering Schema to use for numbering sections, e.g. 1.A.1. columns Number of columns for body text. Variables for An array of strings (schema). Defaults to ["textual"]. accessModeSufficient An array of strings (schema). Defaults to ["textual"]. accessibilityHazards An array of strings (schema). Defaults to ["none"] ["none"]. accessibilityFeatures An array of strings (schema). Defaults to 132 The epub:type attribute - "alternativeText" - "readingOrder" - "structuralNavigation" - "tableOfContents" accessibilitySummary