Baseline Widely available
The Document.createAttribute() method creates a new attribute node, and returns it. The object created is a node implementing the Attr interface. The DOM does not enforce what sort of attributes can be added to a particular element in this manner.
Note: The string given in parameter is converted to lowercase.
Syntax Parametersname
A string containing the name of the attribute.
A Attr node.
InvalidCharacterError DOMException
Thrown if the name 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("div1");
const a = document.createAttribute("my_attrib");
a.value = "newVal";
node.setAttributeNode(a);
console.log(node.getAttribute("my_attrib")); // "newVal"
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