The HTML 4.01 specification puts it simply and clearly: "A link is a connection from one web resource to another." This ability to create hyperlinks from one document to another is what makes HTML unique among document markup languages and is the key to its widespread popularity. You can create a link to any web resource, including (but not limited to) another HTML document, an image, a program, or a particular element within an HTML document. This chapter focuses on these HTML elements related to linking and building relationships between documents.
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