Feature Request: Support document.evaluate

[cyber-brando]

querySelector for CSS classes works in custom cases, but not in cases where you are unable to edit the CSS of an element.

Our use-case is we utilize ag-Grid for our application tables. We want to create intro-js events that go through all the headers and explain more in depth what the data represents. All headers have the same CSS classes so we are only able to select the first one.

querySelector would allow us to select by text, which would make it a lot easier when you have no control over styles.