Home Web Front-end Front-end Q&A What is the document type declaration of html5?

What is the document type declaration of html5?

Jan 23, 2022 am 11:14 AM
html5

In html5, the document type declaration is a DOCTYPE declaration, and the syntax is "". The DOCTYPE declaration is a standard universal markup language document type declaration that allows browsers to understand the HTML specification being used by an HTML5 document.

What is the document type declaration of html5?

The operating environment of this tutorial: Windows 7 system, HTML5 version, Dell G3 computer.

In html5, the document type declaration is the DOCTYPE declaration.

The DOCTYPE declaration is a standard universal markup language document type declaration that allows the browser to understand the HTML specification being used by the HTML5 document.

The DOCTYPE declaration is the starting point of the HTML5 document, which means it must be located on the first line of the HTML5 document, before the tag. The

<!DOCTYPE> declaration is not an HTML tag; it is used to tell the web browser which version of HTML is used for the page.

In HTML 4.01, the <!DOCTYPE> declaration needs to reference the DTD (Document Type Declaration) because HTML 4.01 is based on SGML (Standard Generalized Markup Language). DTD specifies the rules of the markup language to ensure that the browser can render the content correctly.

HTML5 is not based on SGML and therefore does not require DTD reference.

Tip: Always add the <!DOCTYPE> declaration to your HTML document to ensure the browser knows the document type in advance.

HTML 4.01 specifies three different <!DOCTYPE> declarations: Strict, Transitional, and Frameset. Only one type is specified in HTML5:

<!DOCTYPE html>
Copy after login

Example: Basic document structure

<!DOCTYPE html>


 
文档标题
 

文档内容......
 
Copy after login

Note:

  • <!DOCTYPE> The tag has no closing tag.

  • <!DOCTYPE> Declarations are not case-sensitive.

Related recommendations: "html video tutorial"

The above is the detailed content of What is the document type declaration of html5?. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Table Border in HTML Table Border in HTML Sep 04, 2024 pm 04:49 PM

Guide to Table Border in HTML. Here we discuss multiple ways for defining table-border with examples of the Table Border in HTML.

Nested Table in HTML Nested Table in HTML Sep 04, 2024 pm 04:49 PM

This is a guide to Nested Table in HTML. Here we discuss how to create a table within the table along with the respective examples.

HTML margin-left HTML margin-left Sep 04, 2024 pm 04:48 PM

Guide to HTML margin-left. Here we discuss a brief overview on HTML margin-left and its Examples along with its Code Implementation.

HTML Table Layout HTML Table Layout Sep 04, 2024 pm 04:54 PM

Guide to HTML Table Layout. Here we discuss the Values of HTML Table Layout along with the examples and outputs n detail.

Moving Text in HTML Moving Text in HTML Sep 04, 2024 pm 04:45 PM

Guide to Moving Text in HTML. Here we discuss an introduction, how marquee tag work with syntax and examples to implement.

HTML Ordered List HTML Ordered List Sep 04, 2024 pm 04:43 PM

Guide to the HTML Ordered List. Here we also discuss introduction of HTML Ordered list and types along with their example respectively

HTML onclick Button HTML onclick Button Sep 04, 2024 pm 04:49 PM

Guide to HTML onclick Button. Here we discuss their introduction, working, examples and onclick Event in various events respectively.

HTML Input Placeholder HTML Input Placeholder Sep 04, 2024 pm 04:54 PM

Guide to HTML Input Placeholder. Here we discuss the Examples of HTML Input Placeholder along with the codes and outputs.

See all articles