5. The method of claim 1 further comprising: determining the scroll rate of the portion of the document; and generating the document that specifies the directive, based on the determined scroll rate of the portion of the document.
5. The method of claim 1 further comprising: determining the scroll rate of the portion of the document; and generating the document that specifies the directive, based on the determined scroll rate of the portion of the document. 6. The method of claim 5 , wherein: the determining the scroll rate includes accessing an initial scroll rate from a table that correlates the initial scroll rate with a text size used in the portion of the document.