See the highlighted part below. I can't see anything in the double-quote.
Can you speak to this?
Fixed a problem with the wiki software handling double slashes:
XPath as long as it starts with “/html”, “/HTML” or “
But I would rely more on the w3schools reference provided at the start of the article:
XPath Syntax -- w3schools
This is simply documenting when Keyboard Maestro actions will consider the content of the field to be an XPath. If it doesn't start with slash html or slash HTML or slash slash, then whether it is a valid XPath or not is irrelevant because Keyboard Maestro will not interpret it as an XPath.