HTML 4.01 Strict DTD includes all elements and attributes that have not been deprecated or do not appear in frameset documents
"http://www.w3.org/TR/html4/strict.dtd">
HTML 4.01 Transitional DTD includes everything in the strict DTD plus deprecated elements and attributes
HTML 4.01 Frameset DTD includes everything in the transitional DTD plus frames
"http://www.w3.org/TR/html4/frameset.dtd">
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