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The structural layer of a web page is created by a markup language such as HTML or XHTML.
Tags, or words that appear in Angle brackets, describe the semantic meaning of web content, but they don't contain any information about how to display the content.
For example, the P tag expresses the semantics: "this is a text segment."
The presentation layer is created by CSS.
CSS answers the question "how to display content".
The behavior layer of a web page answers the question, "how should content react to events?"
This is where the Javascript language and the DOM dominate.
Use (X)HTML to structure the document.
Use CSS to set the rendering of the document.
DOM scripts are used to implement the behavior of the document.
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