Let's also put the locale info on here.  Add another data-* attribute to hold what's in the value of `<html lang="...">` and set it dynamically.  So your final script tag would look like:

`<script src="http://somewhere.com/webxray.js" className="webxray" data-baseuri="http://somewhere.com" data-lang="en-US"></script>`

Now you can pull the baseuri and lang off the script element when the bookmarklet is run.