From W3C Wiki
The <a> element represents a hyperlink.
Specifies that its a element is a named hyperlink, with the name given by the value of this attribute.
The name attribute on the a element is obsolete. Consider putting an id attribute on the nearest container instead.
Any string, with the following restrictions:
- must be at least one character long
- must not contain any space characters
href= URL potentially surrounded by spaces
A URL that provides the destination of the hyperlink. If the href attribute is not specified, the element represents a placeholder hyperlink.
target= browsing-context name or keyword
A name or keyword giving a browsing context for UAs to use when following the hyperlink.
The target attribute on the a element was deprecated in a previous version of HTML, but is no longer deprecated, as it is useful in Web applications, particularly in combination with the iframe element.
Any string that is either of the following:
- a browsing-context name
- any case-insensitive match for one of the following literal strings: "_blank", "_self", "_parent", or "_top".
- Default target is "_self".
- You can also set target to an iframe.
rel= set of space-separated tokens
A list of tokens that specify the relationship between the document containing the hyperlink and the destination indicated by the hyperlink.
hreflang= language tag
The language of the destination of the hyperlink.
A valid language tag, as defined in [BCP47].
media= media-query list
The media for which the destination of the hyperlink was designed.
A valid media query list, as defined in [MediaQueries].
type= MIME type
The MIME type of the destination of the hyperlink.
A string that identifies a valid MIME media type, as defined in [RFC2046].
See also global attributes.
The following attributes are obsolete, and must not be used by authors:
name (if empty string),
<p> <a href="http://en.wikipedia.org/wiki/Cambera">Cambera</a> is the capital city of Australia. </p>
<p> Hey, check out <a href="http://another_website.com" rel="nolink">my website</a>. </p>
<p> <a href="http://another_website.com" target="_blank">Popup</a> </p>
The HTML5 specification defines the <a> element in 4.6.1 The a element.