[e] (0) Let's try some more explanatory text
Fixing https://www.w3.org/Bugs/Public/show_bug.cgi?id=21416
Affected topics: DOM APIs

Syncing source with changes for Web Workers (for consistency)

git-svn-id: http://svn.whatwg.org/webapps@7892 340c8d12-0b0e-0410-8428-c7bf67bfef74
(cherry picked from commit e4b70c5a672d1a0ec04e27d113176e6099f03632)