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why do we use <!doctype html> in the html5 and why not in html? what is the use of it?
2 Respuestas
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The doctype declaration is not an HTML tag; it is an instruction to the web browser about what version of the markup language the page is written in. The doctype declaration refers to a Document Type Definition (DTD). it just tells the browser about which html version is being used.
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in html4 was :
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">