HTMLBaseElement: href property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The href property of the HTMLBaseElement interface contains a string that is the URL to use as the base for relative URLs.

It reflects the href attribute of the <base> element.

Value

A string that contains a URL, or the empty string ("") if the corresponding <base> element does not include the href attribute.

Examples

HTML with base URL

This example demonstrates that the href attribute in <base> is reflected in the href property of HTMLBaseElement.

<pre id="log"></pre>

const logElement = document.querySelector("#log");
function log(text) {
  logElement.innerText = text;
}

#log {
  height: 20px;
}

HTML

html

<base href="https://developer.mozilla.org/example" />

JavaScript

const base = document.getElementsByTagName("base")[0];
log(`base.href="${base.href}"`);

Result

Specifications

Specification
HTML # dom-base-href

desktop mobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
href
data: and javascript: urls are not allowed
tab, newline, and < are not allowed (dangling markup prevention)