Adding Styles to a Document
Style rules can be applied to documents in three ways: as inline style directions, as style elements embedded at the top of the document itself, and as external files that can be either linked to or imported into the document.
Tip
When attaching styles to a document, it is important to keep in mind that other style sheets may apply to your document as well. User agents, such as browsers, have built-in style sheets for rendering content. In addition, individual users may create their own style sheets and apply them to a single site or to all the sites they visit in order to make the text comfortable to read or to meet special needs. Which style sheet takes precedence is covered in the upcoming "Document Structure and Inheritance" section.
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