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Document: createAttributeNS() method - Web APIs | MDN
createAttributeNS(namespaceURI, qualifiedName)
namespaceURI
A string that specifies the namespaceURI
to associate with the attribute. Some important namespace URIs are:
HTML
https://www.w3.org/1999/xhtml
SVG
https://www.w3.org/2000/svg
MathML
https://www.w3.org/1998/Math/MathML
qualifiedName
A string that specifies the name of attribute to be created.
The name
property of the created attribute is initialized with the value of qualifiedName
.
NamespaceError
DOMException
Thrown if the namespaceURI
value is not a valid namespace URI.
InvalidCharacterError
DOMException
Thrown if the qualifiedName
value is not a valid XML name ; for example, it starts with a number, hyphen, or period, or contains characters other than alphanumeric characters, underscores, hyphens, or periods.
const node = document.getElementById("svg");
const a = document.createAttributeNS("https://www.w3.org/2000/svg", "viewBox");
a.value = "0 0 100 100";
node.setAttributeNode(a);
console.log(node.getAttribute("viewBox")); // "0 0 100 100"