test('should handle duplicate qualified names from different namespaces', () => {
		const doc = new DOMImplementation().createDocument(null, 'xml');
		const element = doc.documentElement;

		// Create attributes with same local name but different namespaces
		element.setAttributeNS('http://ns1.example.com', 'test', 'value1');
		element.setAttributeNS('http://ns2.example.com', 'test', 'value2');

		// Should return both attributes
		expect(element.getAttributeNames()).toEqual(['test', 'test']);

		// TODO: there seems to be a bug in the serialization of this document.
		//       It outputs xmlns twice, the serializer should probably automatically prefix the namespaces
	});

<xml xmlns="http://ns1.example.com" test="value1" xmlns="http://ns2.example.com" test="value2"/>

const doc = document.implementation.createDocument(null, 'xml');
const element = doc.documentElement;

element.setAttributeNS('http://ns1.example.com', 'test', 'value1');
element.setAttributeNS('http://ns2.example.com', 'test', 'value2');

const serializer = new XMLSerializer();
const xmlStr = serializer.serializeToString(doc);

<xml xmlns:ns1="http://ns1.example.com" ns1:test="value1" xmlns:ns2="http://ns2.example.com" ns2:test="value2"/>