Anchor tags are commonly used to link separate webpages, but they can also be used to link between different places in a single document, often within table of contents or even launch external applications. This topic explains the implementation and application of HTML anchor tags in various roles.
<a href="URL or anchor">Link Text</a>
|Specifies the destination address. It can be an absolute or relative URL, or the |
|Specifies the language of the resource linked by the |
|Specifies the relationship between the current document and the linked document. For HTML5, the values must be defined in the specification or registered in the Microformats wiki.|
|Specifies where to open the link, e.g. in a new tab or window. Possible values are |
|Specifies extra information about a link. The information is most often shown as a tooltip text when the cursor moves over the link. This attribute is not restricted to links, it can be used on almost all HTML tags.|
|Specifies that the target will be downloaded when a user clicks on the hyperlink. The value of the attribute will be the name of the downloaded file. There are no restrictions on allowed values, and the browser will automatically detect the correct file extension and add it to the file (.img, .pdf, etc.). If the value is omitted, the original filename is used.|
This is the basic use of the
<a> (anchor element) element:
<a href="http://example.com/">Link to example.com</a>
It creates a hyperlink, to the URL
http://example.com/ as specified by the
href (hypertext reference) attribute, with the anchor text "Link to example.com". It would look something like the following:
To denote that this link leads to an external website, you can use the
external link type:
<a href="http://example.com/" rel="external">example site</a>
You can link to a site that uses a protocol other than HTTP. For example, to link to an FTP site, you can do,
<a href="ftp://example.com/">This could be a link to a FTP site</a>
In this case, the difference is that this anchor tag is requesting that the user's browser connect to
example.com using the File Transfer Protocol (FTP) rather than the Hypertext Transfer Protocol (HTTP).
<a href="example.com" target="_blank">Text Here</a>
target attribute specifies where to open the link. By setting it to
_blank, you tell the browser to open it in a new tab or window (per user preference).
SECURITY VULNERABILITY WARNING!
target="_blank"gives the opening site partial access to the
window.opener.locationof your page and potentially redirect users to malware or phishing sites.
Whenever using this for pages you do not control, add
rel="noopener"to your link to prevent the
window.openerobject from being sent with the request.
Currently, Firefox does not support
noopener, so you will need to use
rel="noopener noreferrer"for maximum effect.
Anchors can be used to jump to specific tags on an HTML page. The
<a> tag can point to any element that has an
id attribute. To learn more about IDs, visit the documentation about Classes and IDs. Anchors are mostly used to jump to a subsection of a page and are used in conjunction with header tags.
Suppose you've created a page (
page1.html) on many topics:
<h2>First topic</h2> <p>Content about the first topic</p> <h2>Second topic</h2> <p>Content about the second topic</p>
Once you have several sections, you may want to create a Table of Contents at the top of the page with quick-links (or bookmarks) to specific sections.
If you gave an
id attribute to your topics, you could then link to them
<h2 id="Topic1">First topic</h2> <p>Content about the first topic</p> <h2 id="Topic2">Second topic</h2> <p>Content about the second topic</p>
Now you can use the anchor in your table of contents:
<h1>Table of Contents</h1> <a href='#Topic1'>Click to jump to the First Topic</a> <a href='#Topic2'>Click to jump to the Second Topic</a>
These anchors are also attached to the web page they're on (
page1.html). So you can link across the site from one page to the other by referencing the page and anchor name.
Remember, you can always <a href="page1.html#Topic1">look back in the First Topic</a> for supporting information.
Simply use the
You can also achieve the same thing using the
<a href="#" onclick="myFunction(); return false;">Run Code</a>
return false; is necessary to prevent your page from scrolling to the top when the link to
# is clicked. Make sure to include all code you'd like to run before it, as returning will stop execution of further code.
Also noteworthy, you can include an exclamation mark
! after the hashtag in order to prevent the page from scrolling to the top. This works because any invalid slug will cause the link to not scroll anywhere on the page, because it couldn't locate the element it references (an element with
id="!"). You could also just use any invalid slug (such as
#scrollsNowhere) to achieve the same effect. In this case,
return false; is not required:
<a href="#!" onclick="myFunction();">Run Code</a>
Should you be using any of this?
Also consider whether this element is really a button instead of a link. If so, you should use
You can use a relative path to link to pages on the same website.
<a href="/example">Text Here</a>
The above example would go to the file
example at the root directory (
/) of the server.
If this link was on http://example.com, the following two links would bring the user to the same location
<a href="/page">Text Here</a> <a href="http://example.com/page">Text Here</a>
Both of the above would go to the
page file at the root directory of
If the value of the
href-attribute begins with
mailto: it will try to open an email client on click:
<a href="mailto:[email protected]">Send email</a>
This will put the email address
[email protected] as the recipient for the newly created email.
Cc and Bcc
You can also add addresses for cc- or bcc-recipients using the following syntax:
<a href="mailto:[email protected][email protected]&[email protected]">Send email</a>
Subject and body text
You can populate the subject and body for the new email as well:
<a href="mailto:[email protected]?subject=Example+subject&body=Message+text">Send email</a>
Those values must be URL encoded.
Clicking on a link with
mailto: will try to open the default email client specified by your operating system or it will ask you to choose what client you want to use. Not all options specified after the recipient's address are supported in all email clients.
If the value of the
href-attribute begins with
tel:, your device will dial the number when you click it. This works on mobile devices or on computers/tablets running software – like Skype or FaceTime – that can make phone calls.
<a href="tel:11234567890">Call us</a>
Most devices and programs will prompt the user in some way to confirm the number they are about to dial.