3515: Add keyboard shortcut '?' that shows shortcuts for the current page

josh.******@gmai***** (Google Code) (Is this you? Claim this profile.)
What version are you running?

What's the URL of the page this enhancement relates to, if any?
all urls with keyboard shortcuts

Describe the enhancement and the motivation for it.
I would like to use keyboard shortcuts, but sometimes forget relevant keys.  Rather than looking them up elsewhere, the page itself could inform me.

What operating system are you using? What browser?

Please provide any additional information below.

Have a look at http://www.impressivewebs.com/demo-files/question-mark-js/
#1 smacleod
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