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

Node: isDefaultNamespace() method - Web APIs

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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)

namespaceURI

A string representing the namespace against which the element will be checked.

Note: namespaceURI is not an optional parameter, but can be null.

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 &lt;output&gt;:
<output>Not tested</output>.<br />
Is "" the default namespace for &lt;svg&gt;: <output>Not tested</output>.<br />
Is "http://www.w3.org/2000/svg" the default namespace for &lt;svg&gt;:
<output>Not tested</output>.<br />
<svg xmlns="http://www.w3.org/2000/svg" height="1"></svg>
<button>Click to run tests</button>

const button = document.querySelector("button");
button.addEventListener("click", () => {
  const aHtmlElt = document.querySelector("output");
  const aSvgElt = document.querySelector("svg");

  const result = document.getElementsByTagName("output");
  result[0].value = aHtmlElt.isDefaultNamespace(""); // true
  result[1].value = aHtmlElt.isDefaultNamespace("http://www.w3.org/2000/svg"); // false
  result[2].value = aSvgElt.isDefaultNamespace(""); // false
  result[3].value = aSvgElt.isDefaultNamespace("http://www.w3.org/2000/svg"); // true
});

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