Use xpath instead of coordinates

What do you think about specifying an xpath instead of coordinates for a click action? This is probably more useful because I don't want to re-record my tests when I changed the location of a button.

With [`document.evaluate()`](https://developer.mozilla.org/en-US/docs/Web/API/document.evaluate) you're able to get a reference of the DOM element.

Start by locating the click-action implementation and any tests for coordinate-based clicks; the issue does not name files or entry points. Read the linked document.evaluate() API and determine how an XPath-based click would fit the existing test model, with completion meaning a button can be located by XPath after its screen position changes.

Written by the indexing model from the issue text.