The first time you go to http://ie.microsoft.com/testdrive/HTML5/Cookbook/ it asks you to use offline storage through both a doorhanger and a notification bar.
You need to click 'Start' to get both prompts.
Dupe of/related to Bug 588305?
This seems to be a dupe of 700933 which has a bit more details.
Status: NEW → RESOLVED
Last Resolved: 7 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 700933
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