Unable to evaluate XPath for Element Attribute

[luechtdev]

Basic info:

• Node.js version: v16.2.0
• jsdom version: ^18.1.0

Minimal reproduction case

import { JSDOM } from "jsdom";

const xml = `
<PARAGRAPH>
    This is a text, about something, that happened on 
    <DATE ISO="20131117">17.November 2013</DATE>
    . It is a very important date.
</PARAGRAPH>
`;

const dom = new JSDOM(xml, {contentType: "application/xml"});
const doc = dom.window.document;

// 2: XPathResult.STRING_TYPE
const date = doc.evaluate("PARAGRAPH/DATE/@ISO", doc, null, 2, null).stringValue;

console.log(date);

I can't seem to be able to get XML Attributes using JSDOM and XPath Syntax on this XML Snippet.

<PARAGRAPH>
    This is a text, about something, that happened on 
    <DATE ISO="20131117">17.November 2013</DATE>
    . It is a very important date.
</PARAGRAPH>

By my understanding PARAGRAPH/DATE/@ISO is valid XPath Syntax for the Attribute and it's working just fine on sites like Xpather

Expected Result: / Result of Browser DOMParser: "20131117"

Actual Result w/ JSDOM: ""

Other non-working approaches

PARAGRAPH//DATE/@ISO,
string(PARAGRAPH/DATE/@ISO), XPath.FIRST_ORDERED_NODE_TYPE

The evaluation seems to come back empty.

[TimothyGu]

Unfortunately, our XPath support has quite a few issues. If you must use XPath, I recommend that you use an alternative JavaScript implementation.