Attr interface represents one of an element's attributes as an object. In most situations, you will directly retrieve the attribute value as a string (e.g.,
Element.getAttribute()), but certain functions (e.g.,
Element.getAttributeNode()) or means of iterating return
The core idea of an object of type
Attr is the association between a name and a value. An attribute may also be part of a namespace and, in this case, it also has a URI identifying the namespace, and a prefix that is an abbreviation for the namespace.
The name is deemed local when it ignores the eventual namespace prefix and deemed qualified when it includes the prefix of the namespace, if any, separated from the local name by a colon (
:). We have three cases: an attribute outside of a namespace, an attribute inside a namespace without a prefix defined, an attribute inside a namespace with a prefix:
|Attribute||Namespace name||Namespace prefix||Attribute local name||Attribute qualified name|
Note: This interface represents only attributes present in the tree representation of the
Element, being a SVG, an HTML or a MathML element. It doesn't represent the property of an interface associated with such element, such as
HTMLTableElement for a
<table> element. (See this article for more information about attributes and how they are reflected into properties.)
This interface also inherits the properties of its parent interfaces,
A string representing the local part of the qualified name of the attribute.
The attribute's qualified name. If the attribute is not in a namespace, it will be the same as
A string representing the URI of the namespace of the attribute, or
nullif there is no namespace.
Elementthe attribute belongs to.
A string representing the namespace prefix of the attribute, or
nullif a namespace without prefix or no namespace are specified.
specifiedRead only Deprecated
This property always returns
The attribute's value, a string that can be set and get using this property.
This interface has no specific methods, but inherits the methods of its parent interfaces,
|DOM Standard |
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- Other nodes are