overview of Doctypes

HTML Doctype Overview
Doctypes - short for 'document type' - help browsers to understand the version of HTML the document is written in for better interpretability.
Doctype declarations are not HTML tags and belong at the very top of a document.
This topic explains the structure and declaration of various doctypes in HTML.
Adding the Doctype
The <!DOCTYPE> declaration should always be included at the top of the HTML document, before the <html> tag.
Version ≥ 5
See HTML 5 Doctype for details on the HTML 5 Doctype.
<!DOCTYPE html>
HTML5 Doctype
HTML5 is not based on SGML (Standard Generalized Markup Language), and therefore does not require a reference to a DTD (Document Type Definition).
HTML 5 Doctype declaration:
<!DOCTYPE html>
Case Insensitivity Per the W3.org HTML 5 DOCTYPE Spec:
A DOCTYPE must consist of the following components, in this order:
- A string that is an ASCII case-insensitive match for the string "<!DOCTYPE".
therefore the following DOCTYPEs are also valid:
- <!doctype html>
- <!dOCtyPe html>
- <!DocTYpe html>
ATutorialHub Related Guide
HTML Tutorials Comments (9)
User Comments

panduranga gupta
2021-07-05 07:03:13good website for learning and help me a lot

raju
2021-09-25 14:58:47The awsome website i am looking like for a long time, good work atutorialhub team keep doing

Shivani
2021-09-01 15:03:56Learning a lot from the courses present on atutorialhub. The courses are very well explained. Great experience

Harshitha
2021-09-10 15:05:45It is very helpful to students and easy to learn the concepts

Sowmya
2021-09-14 15:06:41Great job Tutorials are easy to understand Please make use of it

Zain Khan
2021-09-18 15:07:23Great content and customized courses.

Rudrakshi Bhatt
2021-09-09 15:08:10Well structured coursed and explained really well!

Pavana Somashekar
2021-09-11 15:09:08Good platform for beginners and learn a lot on this website

Sax
2021-09-25 19:35:50Nice website
Leave a Comment