Is html5 the fifth revision?

html5 is the fifth revision. HTML5 is the fifth revision to the HTML standard. Its main goal is to semanticize the Internet so that it can be better read by humans and machines, and at the same time provide better support for the embedding of various media; the syntax of HTML5 is backward compatible.

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

HTML5

HTML5 is the fifth revision to the HTML standard. Its main goal is to semanticize the Internet so that it is better readable by humans and machines, and at the same time provide better support for embedding of various media. HTML5 syntax is backwards compatible. H5, which is now commonly referred to in China, includes CSS3 and JavaScript (strictly speaking, it is not appropriate to call it this way, but it is already wrong to call it this way).

HTML5 is the latest revised version of HTML. The standard was completed by the World Wide Web Consortium (W3C) in October 2014.

HTML5 is designed to support multimedia on mobile devices.

Some interesting new features in HTML5:

• The canvas element for painting.

• Video and audio elements for media playback

• Better support for local offline storage.

• New special content elements, such as article, footer, header, nav, section.

• New form controls, such as calendar, date, time, email, url, search.

Improvements in HTML5

• New elements

• New attributes

• Fully supports CSS3

• Video and Audio

• ##2D/3D graphics

• Local storage

• Local SQL data

• Web application

New elements and attributes

1. Semantic tags

Semantic tags make the content of the page structured and well-known

## Tag

< ;nav>

## Used to describe details of a document or a section of a documentThe tag contains the title of the details elementDefine dialog box, such as prompt box

Description

defines the document The header area

defines the tail area of ​​the document

Define the navigation of the document

Define the sections in the document (section, section)

Define independent content areas of the page

Define the sidebar content of the page

##

2. Enhanced form

HTML5 has multiple new form input types. These new features provide better input control and validation.

Input type	Description
color	Mainly used to select colors
date	Select a date from a date picker
datetime	Select a date (UTC time)
datetime-local	Select a date and time (no time zone)
email	Input field containing the e-mail address
month	Select a month
number	Input of numerical value Field
range	Input field for numeric values ​​within a certain range
search	Used for search domain
tel	Define the input phone number field
time	Select a time
url	Input of URL address Field
week	Select the week and year

HTML5 also adds the following Form Element

Form Element	Description
	The element specifies the option list of the input field Use the list attribute of the element to bind the id of the
	Provides a reliable way to authenticate the user The tag specifies the key pair generator field to be used in the form.
	For different types of output such as calculations or scripts Output

HTML5 new form attribute

• placehoder attribute, a short prompt will be displayed on the input field before the user enters the value. That is, our common default prompt of the input box disappears after the user inputs.

• required attribute is a boolean attribute. The input field required to be filled in cannot be empty

• pattern attribute describes a regular expression used to verify the value of the element.

• min and max attributes, set the minimum and maximum value of the element.

• step attribute specifies the legal number interval for the input field.

• height and width attributes, used for the image height and width of the tag of type image.

• The autofocus attribute is a boolean attribute. Specifies that the field automatically gains focus when the page loads.

• multiple attribute is a boolean attribute. Specifies that multiple values ​​can be selected within the element.

HTML5 Multimedia

Using HTML5, you can simply play video and audio on web pages. ).

• ##HTML5 provides a standard for playing audio files, that is, using the control attribute of the

<audio controls>
  <source src="horse.ogg" type="audio/ogg">
  <source src="horse.mp3" type="audio/mpeg">
您的浏览器不支持 audio 元素。
</audio>

Add play, pause and volume controls.

Between you need to insert the prompt text of the

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