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What is a DTD (Document Type Definition) and why is it important?

April 26, 2017definition DOCUMENT DTD type

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What is a DTD (Document Type Definition) and why is it important?

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DTD or Document Type Definition is used to define the allowable syntax used in your documents. By placing a DTD into your document you can validate or check your markup against an established standard. XHTML 1.0 has three flavors of DTD: Transitional, Strict and Frameset. To learn more about XHTML’s DTDs and validation check out the examples and information from w3schools.