[giow] (2) Describe what happens when you try to run a bad script as a worker
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=24088
Affected topics: DOM APIs, Workers

git-svn-id: http://svn.whatwg.org/webapps@8361 340c8d12-0b0e-0410-8428-c7bf67bfef74