Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In Web development, "tag soup" refers to formatted markup written for a web page that is very much like HTML but does not consist of correct HTML syntax and document structure. Because web browsers have historically treated HTML syntax or structural errors leniently, there has been little pressure for web developers to follow published standards, and therefore there is a need for all browser implementations be able to treat what looks like HTML as "tag soup", accepting and correcting for invalid syntax and structure.

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