+ 9

Is !doctype declaration optional

Please I want to know if the !doctype declaration in html is optional or not

html tag !doctype

12th Jul 2019, 9:31 PM

Boakye Osei Benjamin

11 Answers

+ 14

Well usually it is mandatory, because it’s a declaration for saying it’s a html document.

12th Jul 2019, 9:36 PM

JTLZ

+ 13

The doctype declaration should be the very first thing in an HTML document, before the tag. The doctype declaration is not an HTMLtag; 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). But the most important thing is that with most families of browsers, a doctype declaration will make a lot of guessing unnecessary, and will thus trigger a "standard" rendering mode. Not including it will make the browser just try to parse HTML as best it can. But not all elements will be displayed correctly .DOCTYPE is a required part of all HTML documents

13th Jul 2019, 8:32 AM

Akubia Godwin Maxwell

+ 8

It's optional, but if your code contains html 5 codes, you need to add !doctype to tell the browser that you are coding in html 5 if not, the html 5 codes won't work properly because the browser will assume that you are coding in html 4.

12th Jul 2019, 9:45 PM

Samagidi Victor - Vikksy

+ 6

it is optional depending on your HTML version if you don't use it your webpage would rather be a html4 webpage

13th Jul 2019, 3:00 AM

Soumyajeet Routray

+ 6

Common DOCTYPE Declarations HTML 5 <!DOCTYPE html> HTML 4.01 Strict This DTD contains all HTML elements and attributes, but does NOT INCLUDE presentational or deprecated elements (like font). Framesets are not allowed. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> HTML 4.01 Transitional This DTD contains all HTML elements and attributes, INCLUDING presentational and deprecated elements (like font). Framesets are not allowed. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> HTML 4.01 Frameset This DTD is equal to HTML 4.01 Transitional, but allows the use of frameset content. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">

13th Jul 2019, 4:05 PM

Soumyajeet Routray

+ 6

Its optional but it means u are working with html2 ... But if u want to use html5 u must use !doctype

14th Jul 2019, 9:16 AM

Takam Darios

+ 5

XHTML 1.0 Strict This DTD contains all HTML elements and attributes, but does NOT INCLUDE presentational or deprecated elements (like font). Framesets are not allowed. The markup must also be written as well-formed XML. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> XHTML 1.0 Transitional This DTD contains all HTML elements and attributes, INCLUDING presentational and deprecated elements (like font). Framesets are not allowed. The markup must also be written as well-formed XML. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> XHTML 1.0 Frameset This DTD is equal to XHTML 1.0 Transitional, but allows the use of frameset content. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">

13th Jul 2019, 4:07 PM

Soumyajeet Routray

+ 5

XHTML 1.1 This DTD is equal to XHTML 1.0 Strict, but allows you to add modules (for example to provide Ruby support for East-Asian languages). <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

13th Jul 2019, 4:08 PM

Soumyajeet Routray

+ 4

This is list of HTML declarations

13th Jul 2019, 4:08 PM

Soumyajeet Routray

+ 4

You must use it to use html5

24th Jul 2019, 3:57 AM

Rabhik