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Chapter 2. DOCTYPES

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Document Types, abbreviated as “doctypes” aid browsers in interpreting the version of HTML utilized within a document, enhancing its interpretability. Doctype declarations, distinct from HTML tags, are positioned at the document’s outset. This discussion elucidates the organization and declaration of diverse doctypes within HTML.

2.1 – Including the DOCTYPE

The <!DOCTYPE> declaration is essential and should be positioned at the outset of the HTML document, preceding the <html> tag. For Version 5 and above, refer to HTML 5 Doctype for comprehensive information on the HTML 5 Doctype.

<!DOCTYPE html>

2.2 – DOCTYPE HTML5

Unlike HTML5’s predecessor, SGML (Standard Generalized Markup Language), HTML5 does not necessitate a reference to a Document Type Definition (DTD).

HTML 5 Doctype declaration:

<!DOCTYPE html>

<!DOCTYPE html>

Case Insensitivity:

A DOCTYPE must include the subsequent components, in precise order:

  • A string that is an ASCII case-insensitive match for the string “<!DOCTYPE”. Consequently, the subsequent DOCTYPEs are also deemed valid:

<!doctype html> <!dOCtYPe html> <!DOCtype html>

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