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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" dir="rtl" lang="ar" xml:lang="ar">

???? ????? ?? W3C ?????? ?? ??? ??? ????? ?????? ? ??? ?? ????? ?

??? ??????? ?? ?????? ??? ??? ??????? ?? ??? HTML ??? DTD ?? ?????? ?????? /

Document Type Definition

??????? ???? ?????? ??? ???? ??????? ??? ??? ??????? ????? ??? ???? HTML ? CSS ???? ???? ?? ?????

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http://www.w3schools.com/tags/tag_doctype.asp

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ما المقصود بهذه العباره ؟

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