Having links relative to root?

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A root-relative URL starts with a / character, to look something like <a href="https://stackoverflow.com/directoryInRoot/fileName.html">link text</a>.

The link you posted: <a href="https://stackoverflow.com/questions/5559578/fruits/index.html">Back to Fruits List</a> is linking to an html file located in a directory named fruits, the directory being in the same directory as the html page in which this link appears.

To make it a root-relative URL, change it to:

<a href="https://stackoverflow.com/fruits/index.html">Back to Fruits List</a>

Edited in response to question, in comments, from OP:

So doing / will make it relative to www.example.com, is there a way to specify what the root is, e.g what if i want the root to be www.example.com/fruits in www.example.com/fruits/apples/apple.html?

Yes, prefacing the URL, in the href or src attributes, with a / will make the path relative to the root directory. For example, given the html page at www.example.com/fruits/apples.html, the a of href="https://stackoverflow.com/vegetables/carrots.html" will link to the page www.example.com/vegetables/carrots.html.

The base tag element allows you to specify the base-uri for that page (though the base tag would have to be added to every page in which it was necessary for to use a specific base, for this I’ll simply cite the W3’s example:

For example, given the following BASE declaration and A declaration:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
   "http://www.w3.org/TR/html4/strict.dtd">
<HTML>
 <HEAD>
   <TITLE>Our Products</TITLE>
   <BASE href="http://www.aviary.com/products/intro.html">
 </HEAD>

 <BODY>
   <P>Have you seen our <A href="http://stackoverflow.com/cages/birds.gif">Bird Cages</A>?
 </BODY>
</HTML>

the relative URI “../cages/birds.gif” would resolve to:

http://www.aviary.com/cages/birds.gif

Example quoted from: http://www.w3.org/TR/html401/struct/links.html#h-12.4.

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