Summary of common HTML attribute knowledge points

This time I will bring you a summary of common HTML attribute knowledge points. What are the precautions when using common HTML attributes? The following is a practical case, let’s take a look.

In HTML, attributes are also more important for the entire HTML content. So how much do you know about HTML attributes? What are the attributes of HTML? The following article will give you a detailed introduction to the properties of HTML.

Definition:

HTML attributes: additional information provided by HTML elements

Simple understanding of HTML attributes:

1.HTML elements can set attributes

2. Attributes can add additional information to elements

3. General description and start tag of attributes

4. Attributes always appear in the form of names or value pairs, for example: name: "value"

Simple example to understand attributes:

a link

HTML links are defined by the tag, and the link's address is specified in the href attribute.

HTML common reference attribute values:

Property values ​​should always be enclosed in quotes.

Double quotes are the most commonly used, but there is no problem using single quotes.

Note: In some individual cases, such as the attribute value itself contains double quotes, you must use single quotes, for example: name='John "ShotGun" Nelson'

HTML Tip: Use lowercase attributes

Properties and property values ​​are not case-sensitive.

However, the World Wide Web Consortium recommends lowercase attributes/attribute values ​​in its HTML 4 recommendations.

Newer versions of (X)HTML require lowercase attributes.

HTML Attributes Reference Manual

Label	describe
	Define comments
	Define document type
	Define hypertext links
	Define abbreviation
	The definition only takes the first letter of the abbreviation, and does not support HTML5
	Defines the contact information for the document author or owner
	Deprecated in HTML5. Define embedded applets.
	Define the area inside the image map
（New）	Define an article area
（New）	Define the sidebar content of the page
	Define audio content
	Define text bold
	Defines the default address or default target for all links in the page.
	HTML5 is not supported and deprecated. Define the default font, color, or size for text on the page.
（New）	Allows you to set a piece of text independent of the text direction setting of its parent element.
	Define text direction
	Define large text, HTML5 does not support
	Define long references
	Define the body of the document
	Define newline
	Define a click button
（New）	To define graphics, such as charts and other images, labels are just graphics containers and you must use scripts to draw the graphics
Define table title
	HTML5 is not supported and deprecated. Define centered text.
	Define citation
	Define computer code text
Define attribute values ​​for one or more columns in the table
Define column groups in the table for formatting
（New）	Define command buttons, such as radio buttons, checkboxes or buttons
	Define a list of options. Use this element in conjunction with an input element to define the possible values ​​of the input.
	Define the description of the item in the definition list
	Define deleted text
（New）	Details used to describe a document or part of a document
	Definition definition project
（New）	Define dialog boxes, such as prompt boxes
	HTML5 is not supported and deprecated. Define directory listing.
	Define sections in the document
	Definition list details
	Define items in list
	Define emphasis text
（New）	Define embedded content, such as plug-ins.
	Define the border around elements in the form
（New）	Define the title of the element
（New）	Specify individual stream content (images, charts, photos, code, etc.).
	HTML5 is not supported and deprecated. Define the font, size and color of the text.
（New）	Defines the footer of a section or document.
	Form that defines the HTML document
	Define the window or frame of the frameset
	Define frameset
to	Define HTML title
	Define information about the document
（New）	Defines the header area of ​​the document
	Define horizontal line
	Define HTML document
	Define italics