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The introduction has a paragraph that explains the JavaScript example. In that paragraph is says "it calls a section function, getDatabase()". First, I think "section" is a typo and instead you were meaning "second". Secondly, there is no function called "getDatabase" in the example.
Checked in as WHATWG revision r5315. Check-in comment: example intro correction http://html5.org/tools/web-apps-tracker?from=5314&to=5315