Meta Tag in HTML5

Introduction

Meta elements provide information about a given Web page, most often to help search engines categorize them correctly. They are inserted into the HTML document, but are often not directly visible to a user visiting the site or, Metadata is information about data. The <meta> tag provides metadata about the HTML document. Metadata will not be displayed on the page but will be machine parsable. The HTML <meta> tag is used for declaring metadata for the HTML document. Metadata can include document description, keywords, author, etc. It can also be used to refresh the page or set cookies. The meta tag is placed between the opening/closing <head> </head> tags.

Attributes

HTML tags can contain one or more attributes. Attributes are added to a tag to provide the browser with more information about how the tag should appear or behave. Attributes consist of a name and a value separated by an equals (=) sign, with the value surrounded by double-quotes.

There are 3 kinds of attributes that you can add to your HTML tags: Element-specific, global, and event handler content attributes.

Element-Specific Attributes

The following table shows the attributes that are specific to this tag/element.

Attributes Introduced by HTML5

Attributes	Value	Description
Name	author, description keywords, generator revised, others	It provides a name for the information in the content attribute.
content	text	Specifies the content of the meta-information
http-equiv	content-type, content-style-type expires set-cookie others	It provides an HTTP header for the information in the content attribute.

Global Attributes

The following attributes are standard across all HTML 5 tags.

HTML5 Global Attributes
accesskey	draggable	style
class	hidden	tabindex
dir	spellcheck
contenteditable	id	title
contextmenu	lang

Event Handler Content Attributes

Here are the standard HTML 5 event handler content attributes.

onabort	onerror*	onmousewheel
onblur*	onfocus*	onpause
oncanplay	onformchange	onplay
oncanplaythrough	onforminput	onplaying
onchange	oninput	onprogress
onclick	oninvalid	onratechange
oncontextmenu	onkeydown	onreadystatechange
ondblclick	onkeypress	onscroll
ondrag	onkeyup	onseeked
ondragend	onload*	onseeking
ondragenter	onloadeddata	onselect
ondragleave	onloadedmetadata	onshow
ondragover	onloadstart	onstalled
ondragstart	onmousedown	onsubmit
ondrop	onmousemove	onsuspend
ondurationchange	onmouseout	ontimeupdate
onemptied	onmouseover	onvolumechange
onended	onmouseup	onwaiting

For example

Content Attribute

The required content attribute specifies the content of the meta-information. The value of the content attribute depends on the value of the name or http-equiv attribute.

<html>
<head>
<meta name="description" content="About article" />
<meta name="keywords" content="C#,asp.net,vb.net,sqlserver" />
<meta name="author" content="Rohatash" />
<meta http-equiv="content-type" content="text/html;charset=UTF-8" />
</head>
<body></body>
</html>

Name Attribute

The name attribute provides a name for the information in the content attribute. The value of the name attribute depends on the value of the content attribute. If the http-equiv attribute is set, the name attribute should not be set.

<html>
<head>
<meta name="description" content="About article" />
<meta name="keywords" content="C#,asp.net,vb.net,sqlserver" />
<meta name="author" content="Rohatash" />
</head>
<body></body>
</html>

http-equiv attribute

This attributes Provides an HTTP header for the information in the content attribute. The following example demonstrates how to use the <meta> tag to redirect to another web page.

<html>
<head>
<title>Meta Refresh Example</title>
<meta http-equiv="refresh" content="4;url=http://www.vbdotnetheaven.com/" />
</head>
<body style="background-color:#ff9900;">
<p>Watch me redirect to another page in 4 seconds...</p>
</body>
</html>

Internet Explorer

Figure1

After 4 seconds this page will be redirected to vbdotnetheaven.com.

Figure2

FireFox

Figure3