HTML DOM Element isDefaultNamespace()

Is the defined namespace the default namespace?

let answer = element.isDefaultNamespace("http://www.w3.org/1999/xhtml");

Description

The isDefaultNamespace() method returns true if the elements's namespace is default.

The default namespace URI is the same for HTML and XHTML documents.

All HTML elements inherit the namespace URI of their parents:

http://www.w3.org/1999/xhtml

element.isDefaultNamespace( namespaceURI)

node.isDefaultNamespace( namespaceURI)

Parameter	Description
namespaceURI	Required. The URI of the namespace to check.

Type	Description
Boolean	`true` if the namespace is default, otherwise `false`.

element.isDefaultNamespace() is a DOM Level 3 (2004) feature.

It is fully supported in all modern browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	11