add beacon to find out whether localStorage and sessionStorage work on page loads

we want to know so we can tell if it's worth to add personalisation settings into there

we are going to add a test for indexedDB as well in another PR
Yeah, he does have strong personal opinions. We don't really have a convention for variable ordering. 
Generally if there isn't a js validation rule for it, it's ok (though the ordering of dependencies is an exception)