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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN"
"http://www.w3.org/TR/REC-html40/strict.dtd">
<html lang=en>
<head>
<title>BASE - Document Base URI</title>
<link rev=Made href="mailto:liam@htmlhelp.com">
<link rel=Start href="../index.html">
<link rel=Glossary href="../../glossary/glossary.html">
<link rel=Copyright href="../../copyright.html">
<link rel=StyleSheet href="../style.css" type="text/css">
<link rel=StyleSheet href="../aural.css" type="text/css" media=aural>
<meta http-equiv="Content-Script-Type" content="text/javascript">
<meta name="author" content="Liam Quinn">
<meta name="description" content="A description of HTML 4.0's BASE element for setting a document's base URI.">
<meta name="keywords" content="BASE, base element, base URI, base URL, base href, baseref, HyperText Markup Language, HTML, HTML4, HTML 4.0, Web Design Group, WDG, <base> tag, <BASE> tag">
<script type="text/javascript">
<!--
var hrefspecText;
function hrefReq() {
var gt;
gt = unescape(new String("%3E"));
if (document.readyState == "complete") {
hrefspecText = document.all.hrefspec.innerHTML;
document.all.hrefspec.innerHTML = "<strong class=required" + gt + hrefspecText + "<\/strong" + gt;
window.onload = "";
}
}
function hrefNotReq() {
if (document.readyState == "complete") {
document.all.hrefspec.innerHTML = hrefspecText;
window.onload = "";
}
}
function toggle() {
if (document.all.toggler.value == "Hide non-strict attributes") {
if (document.readyState == "complete") {
hrefReq();
}
else {
window.onload = hrefReq;
}
document.styleSheets[0].addRule("div.transitional", "display:none");
document.styleSheets[0].addRule("li.transitional", "display:none");
document.styleSheets[0].addRule(".transitional", "speak:none");
document.all.toggler.value = "Show non-strict attributes";
} else {
if (document.readyState == "complete") {
hrefNotReq();
}
else {
window.onload = hrefNotReq;
}
document.styleSheets[0].addRule("div.transitional", "display:block");
document.styleSheets[0].addRule("li.transitional", "display:list-item");
document.styleSheets[0].addRule(".transitional", "speak:inherit");
document.all.toggler.value = "Hide non-strict attributes";
}
}
// -->
</script>
</head>
<body>
<h2><img src="../wdglogo1.gif" width=250 height=83 alt="The Web Design Group"></h2>
<h1>BASE - Document Base <abbr class=initialism title="Uniform Resource Identifier">URI</abbr></h1>
<script type="text/javascript">
<!--
if (document.styleSheets) {
var gt;
gt = unescape(new String("%3E"));
document.write("<p" + gt + "<input type=button value=\"Hide non-strict attributes\" id=toggler accesskey=s onclick=\"toggle()\"" + gt + "<\/p" + gt);
}
// -->
</script>
<table>
<tr valign=top>
<th>Syntax</th>
<td><strong class=required><BASE></strong></td>
</tr>
<tr valign=top>
<th>Attribute Specifications</th>
<td>
<ul>
<li id=hrefspec>HREF=<var><a href="../values.html#uri">URI</a></var> (base <abbr class=initialism title="Uniform Resource Identifier">URI</abbr> reference)</li>
<li class=transitional>TARGET=<var><a href="../values.html#frametarget">FrameTarget</a></var> (frame to render links in)</li>
</ul>
</td>
</tr>
<tr valign=top>
<th>Contents</th>
<td>Empty</td>
</tr>
<tr valign=top>
<th>Contained in</th>
<td><a href="head.html">HEAD</a></td>
</tr>
</table>
<p>The <strong class=html>BASE</strong> element defines the document's <em>base <abbr class=initialism title="Uniform Resource Identifier">URI</abbr></em> for resolving relative <abbr class=initialism title="Uniform Resource Identifier">URI</abbr>s contained within the document. A document cannot contain more than one <strong class=html>BASE</strong> element. When present, the <strong class=html>BASE</strong> element must appear in the <strong class=html><a href="head.html">HEAD</a></strong>, prior to any elements that include a partial <abbr class=initialism title="Uniform Resource Identifier">URI</abbr>.</p>
<p><strong class=html>BASE</strong>'s <strong class=html>HREF</strong> attribute, required in <a href="../html/doctype.html#strict">HTML4.0 Strict</a>, specifies the absolute <abbr class=initialism title="Uniform Resource Identifier">URI</abbr> used to resolve relative <abbr class=initialism title="Uniform Resource Identifier">URI</abbr>s. See <cite><a href="http://www.stack.nl/%7Egalactus/html/urls.html">Using Relative <abbr class=initialism title="Uniform Resource Locator">URL</abbr>s</a></cite> for more details on using and resolving relative <abbr class=initialism title="Uniform Resource Identifier">URI</abbr>s.</p>
<p>Most Web pages do not require an explicit base <abbr class=initialism title="Uniform Resource Identifier">URI</abbr> since the document's <abbr class=initialism title="Uniform Resource Identifier">URI</abbr> is a suitable base. An explicit base <abbr class=initialism title="Uniform Resource Identifier">URI</abbr> is only required when the same document may be accessed at different <abbr class=initialism title="Uniform Resource Identifier">URI</abbr>s or when the document has no <abbr class=initialism title="Uniform Resource Identifier">URI</abbr> (<abbr title="for example"><i lang=la>e.g.</i></abbr>, sending an <abbr class=initialism title="HyperText Markup Language">HTML</abbr> document by e-mail).</p>
<div class=transitional>
<p><a name="target">The <strong class=html>TARGET</strong> attribute</a> is used with <a href="../frames/index.html">frames</a> to specify in which frame all links in document should be rendered by default. The target frame specified by <strong class=html>BASE</strong> can be overridden by a given link using the link's <strong class=html>TARGET</strong> attribute.</p>
<p>If no frame with the specified target name exists, the links are rendered in a new window unless overridden by the user. Special frame names begin with an underscore:</p>
<ul>
<li><strong class=html>_blank</strong> renders the links in a new, unnamed window</li>
<li><strong class=html>_self</strong> renders the links in the current frame</li>
<li><strong class=html>_parent</strong> renders the links in the immediate <strong class=html><a href="../frames/frameset.html">FRAMESET</a></strong> parent</li>
<li><strong class=html>_top</strong> renders the links in the full, unframed window</li>
</ul>
</div>
<h2>More Information</h2>
<ul>
<li><a href="http://www.w3.org/TR/REC-html40/struct/links.html#edef-BASE">BASE in <abbr class=initialism title="World Wide Web Consortium">W3C</abbr> HTML4.0 Recommendation</a></li>
<li><a href="http://www.w3.org/TR/REC-html32#base">BASE in <abbr class=initialism title="World Wide Web Consortium">W3C</abbr> HTML3.2 Recommendation</a></li>
<li><a href="http://www.w3.org/MarkUp/html-spec/html-spec_5.html#SEC5.2.2">BASE in HTML2.0 Standard</a></li>
<li><a href="../../wilbur/head/base.html">BASE in <abbr class=initialism title="Web Design Group">WDG</abbr> HTML3.2 Reference</a></li>
<li><a href="http://www.hut.fi/u/jkorpela/HTML3.2/5.7.html">BASE in <cite>Learning HTML3.2 by Examples</cite></a></li>
<li><a href="http://ds.internic.net/rfc/rfc1808.txt"><abbr class=initialism title="Request for Comments">RFC</abbr> 1808: Relative Uniform Resource Locators</a></li>
</ul>
<div class=footer>
<address>Maintained by <a href="http://www.htmlhelp.com/%7Eliam/">Liam Quinn</a> <<a href="mailto:liam@htmlhelp.com">liam@htmlhelp.com</a>></address>
<p class=toolbar><a href="http://www.htmlhelp.com/"><img src="../wdglogo-small.gif" width=105 height=40 alt="Web Design Group ~"></a> <a href="../index.html" rel=Start>HTML4.0Reference</a>~ <a href="../olist.html">ElementsbyFunction</a>~ <a href="../alist.html">ElementsAlphabetically</a></p>
<p class=copyright><a href="../../copyright.html">Copyright </a> 1998 Liam Quinn. All rights reserved.</p>
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