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Declarations not set in the highest priority source are passed on to a source of lower priority, such as the user agent style. One of the goals of CSS is to allow users greater control over presentation.Someone who finds red italic headings difficult to read may apply a different style sheet.CSS lets authors move much of that information to another file, the style sheet, resulting in considerably simpler HTML.For example, headings (), etc., are defined structurally using HTML.It can also display the web page differently depending on the screen size or viewing device.Readers can also specify a different style sheet, such as a CSS file stored on their own computer, to override the one the author specified.
Inheritance relies on the document tree, which is the hierarchy of XHTML elements in a page based on nesting.These sources can be the web browser, the user and the author.
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