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Non-visual users benefit from "space" that is created using semantic markup (see Solid Structure). Space is an important visual design tool that helps us identify groups of related content and delineate unrelated content. Some people need to enlarge text to read it and will not be able to access content set in a text size that is small or doesn't scale correctly. For example, some people may have difficultly tracking along a line of text if its line height (a.k.a. For people with disabilities, these attributes can be essential to a successful user experience. Readability and legibility are key considerations for all users.