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How does a Web browser differentiate between HTML5 and HTML4?

How does a Web browser differentiate between HTML5 and HTML4?

Solution

  • According to w3schools, the following DOCTYPE defines a document as HTML5:

    <!DOCTYPE html>

    And the three types of HTML4 are defined by the following DOCTYPE declarations:

    HTML 4.01 Strict

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

    HTML 4.01 Transitional

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

    HTML 4.01 Frameset

    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">