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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/Element/setAttributeNode below:

Element: setAttributeNode() method - Web APIs

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The setAttributeNode() method of the Element interface adds a new Attr node to the specified element.

If you don't need to work with the attribute node (such as cloning from another element) before adding it, you can use the setAttribute() method instead.

setAttributeNode(attribute)

attribute

The Attr node to add to the element.

The replaced attribute node, if any, returned by this function.

This example copies the align attribute from one element to another.

<div id="one" align="left">one</div>
<div id="two">two</div>

let d1 = document.getElementById("one");
let d2 = document.getElementById("two");
let a = d1.getAttributeNode("align");

d2.setAttributeNode(a.cloneNode(true));

// Returns: 'left'
alert(d2.attributes[1].value);

If the attribute named already exists on the element, that attribute is replaced with the new one and the replaced one is returned.

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