Regarding the "tapping twice" bit: Mobile Safari on iOS has special logic built-in to emulate onmouseover / hover events for situations where that action triggers a change in the page (DOM change or something that gets changed in terms of display:none / visibility:hidden etc).

See the breakdown of the "One Finger Events" on http://developer.apple.com/library/safari/#documentation/AppleApplications/Reference/SafariWebContent/HandlingEvents/HandlingEvents.html#//apple_ref/doc/uid/TP40006511-SW1

Worth noting though that other mobile browsers don't currently have that particular heuristic (though I know of at least one that's planning to add something similar).

P
--
Patrick H. Lauke
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re·dux (adj.): brought back; returned. used postpositively
[latin : re-, re- + dux, leader; see duke.]

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