The isDefaultNamespace()
method of the Node
interface accepts a namespace URI as an argument. It returns a boolean value that is true
if the namespace is the default namespace on the given node and false
if not.
Note: The default namespace of an HTML element is always ""
. For a SVG element, it is set by the xmlns
attribute.
isDefaultNamespace(namespaceURI);
A boolean value that holds the return value true
or false
, indicating if the parameter is the default namespace, or not.
Is "" the default namespace for <output>: <output>Not tested</output>.<br/>
Is "http://www.w3.org/2000/svg" the default namespace for <output>: <output>Not tested</output>.<br/>
Is "" the default namespace for <svg>: <output>Not tested</output>.<br/>
Is "http://www.w3.org/2000/svg" the default namespace for <svg>: <output>Not tested</output>.<br/>
<svg xmlns="http://www.w3.org/2000/svg" height="1"></svg>
<button>Click to see the results</button>
const button = document.getElementsByTagName('button')[0];
button.addEventListener("click", function () {
const aHtmlElt = document.getElementsByTagName('output')[0];
const aSvgElt = document.getElementsByTagName('svg')[0];
const result = document.getElementsByTagName('output');
result[0].value = aHtmlElt.isDefaultNamespace("");
result[1].value = aHtmlElt.isDefaultNamespace("http://www.w3.org/2000/svg");
result[2].value = aSvgElt.isDefaultNamespace("");
result[3].value = aSvgElt.isDefaultNamespace("http://www.w3.org/2000/svg");
});