w3cDom.asString: Namespace for prefix 'xxx' has not been declared #2087
Description
So basically I noticed this crash when trying to use w3CDom.asString() for a site which was created using Vue.js, and it was using "v-bind" in the place of "xxx"
To reproduce you can run the following test case:
@Test
void testNameSpaceCrash()
{
final W3CDom w3CDom = new W3CDom().namespaceAware(false);
final String html = """
<html>
<body>
<div xxx:class="test"></div>
</body>
</html>""";
final Document jSoupDoc = Jsoup.parse(html);
final org.w3c.dom.Document w3CDoc = w3CDom.fromJsoup(jSoupDoc);
assertDoesNotThrow(() -> w3CDom.asString(w3CDoc));
}