title: Does tag manager have a built in way to grab the user's browser (i.e. chrome) and OS ? (for the web)
body: <p>Does tag manager have a way to grab the user's browser version and os?
  I know that it can do this in apps through the pre-defined 'device' variables. But i was wondering if it has something similar for the web built in?
  <br/>
  OR
  <br/>
  will i simply have to roll out my own solution in JS that pushes the browser version and OS to the datalayer, where it can be grabbed by a custom event tag?
  <br/>
  <br/>
  Thanks!</p>