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The baseURI
read-only property returns the absolute base URL of a Node
.
The base URL is used to resolve relative URLs when the browser needs to obtain an absolute URL, for example when processing the HTML <img>
element's src
attribute or XML xlink:href
attribute.
In most cases the base URL is simply the location of the document, but it can be affected by many factors, including the <base>
element in HTML and the xml:base
attribute in XML.
Syntax
var nodeBaseURI = node.baseURI;
Value
A DOMString
representing the base URL of the specified Node
. It may be null
if unable to obtain an absolute URI. Although this property is read-only, its value may change in certain situations (see below).
Details
The base URL of a document
The base URL of a document defaults to the document's address (as displayed by the browser and available in window.location
), but it can be changed:
- When an HTML
<base>
tag is found in the document - When the document is new (created dynamically)
See the Base URLs section of the HTML Living standard for details.
You can use
to obtain the base URL of a document. Note that obtaining the base URL for a document may return different URLs over time if the document
.baseURI<base>
tags or the document's location change.
The base URL of an element
The base URL of an element in HTML normally equals the base URL of the document the node is in.
If the document contains xml:base
attributes (which you shouldn't do in HTML documents), the element.baseURI
takes the xml:base
attributes of element's parents into account when computing the base URL. See xml:base for details.
You can use
to obtain the base URL of an element.element
.baseURI
Specification
Browser compatibility
Desktop | Mobile | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Basic support | Chrome Full support Yes | Edge Full support 12 | Firefox ? | IE ? | Opera ? | Safari ? | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile ? | Firefox Android ? | Opera Android ? | Safari iOS ? | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown
See also
<base>
element (HTML)xml:base
attribute (XML documents).Node.baseURIObject
- a variant of this API for Mozilla add-ons and internal code. Returns the base URL as annsIURI
.