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

Element: hasAttributeNS() method - Web APIs

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The hasAttributeNS() method of the Element interface returns a boolean value indicating whether the current element has the specified attribute with the specified namespace.

If you are working with HTML documents and you don't need to specify the requested attribute as being part of a specific namespace, use the hasAttribute() method instead.

hasAttributeNS(namespace,localName)

namespace

A string specifying the namespace of the attribute.

localName

The name of the attribute.

A boolean.

// Check that the attribute exists before you set a value
const d = document.getElementById("div1");
if (
  d.hasAttributeNS("http://www.mozilla.org/ns/specialspace/", "special-align")
) {
  d.setAttribute("align", "center");
}

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