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HTML lets you specify metadata – additional important information about a document in a variety of ways. The META elements can be used to include name/value pairs describing properties of the HTML document, such as author, expiry date, a list of keywords, document author etc.
The tag is used to provide such additional information. This tag is an empty element and so does not have a closing tag but it carries information within its attributes.
You can include one or more meta tags in your document based on what information you want to keep in your document but in general, meta tags do not impact physical appearance of the document so from appearance point of view, it does not matter if you include them or not.
Adding Meta Tags to Your Documents-
You can add metadata to your web pages by placing tags inside the header of the document which is represented by and tags. A meta tag can have following attributes in addition to core attributes:
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Attribute
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Description
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NAME
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Name for the property. Can be anything. Examples include, keywords, description, author, revised, generator etc.
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CONTENT
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Specifies the property’s value.
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SCHEME
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Specifies a scheme to interpret the property’s value (as declared in the content attribute).
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Http-equiv
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Used for http response message headers. For example, http-equiv can be used to refresh the page or to set a cookie. Values include content-type, expires, refresh and set-cookie.
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Also Read:-Download PHP Important Notes (Beginners To Programmer)HISTORY OF PHPPHP Kya Hota Hai? || What Is PHP?|| PHP क्या होता है ?
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Specifying Keywords-
You can use tag to specify important keywords related to the document and later these keywords are used by the search engines while indexing your webpage for searching purpose.
Example-
Following is an example, where we are adding HTML, Meta Tags, Metadata as important keywords about the document.
Meta Tags Example
Hello HTML5!
This will produce the following result-
Hello HTML5!
Document Description-
You can use tag to give a short description about the document. This again can be used by various search engines while indexing your webpage for searching purpose.
Example-
Meta Tags Example
Hello HTML5!
Document Revision Date-
You can use tag to give information about when last time the document was updated. This information can be used by various web browsers while refreshing your webpage.
Example-
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Hello HTML5!
Document Refreshing-
A tag can be used to specify a duration after which your web page will keep refreshing automatically.
Example-
If you want your page keep refreshing after every 5 seconds then use the following syntax.
Meta Tags Example
Hello HTML5!
Page Redirection-
You can use tag to redirect your page to any other webpage. You can also specify a duration if you want to redirect the page after a certain number of seconds.
Example-
Following is an example of redirecting current page to another page after 5 seconds. If you want to redirect page immediately then do not specify content attribute.
Meta Tags Example
Hello HTML5!
Setting Cookies-
Cookies are data, stored in small text files on your computer and it is exchanged between web browser and web server to keep track of various information based on your web application need.
You can use tag to store cookies on client side and later this information can be used by the Web Server to track a site visitor.
Example-
Following is an example of redirecting current page to another page after 5 seconds. If you want to redirect page immediately then do not specify content attribute.
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