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HTML 4

To balance shifting trends in convention and approach the demand for better standardization across browsers, HTML 4 emerged with some potent rules. These rules, in their strictest incarnation, don't always work in cross-browser/cross-platform design, and they often are not backward compatible. To address these issues, HTML 4 has built-in accommodations for them.

These accommodations are found in the document type definitions (DTDs) found within the HTML 4 specification. DTDs are essentially laundry lists of all the elements, attributes, and syntax conformance rules needed for a document to conform to the real language in question. In formal markup, the DTDs are declared within the document, which you'll see later.


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