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When a word is too wide to fit on the page, it can either be broken into multiple lines or scaled down. This option sets the minimum font size to scale down to (independent of font scaling options set in the ReaderView). Note that the scale is applied to the element that contains the word, meaning that any text around it will also be scaled. If scaling to the minimum is not enough to fit the word, the style overflow-wrap: break-word; will also be applied, allowing the word to be broken up over more than one line.