$().height() = CSS Height  

$().innerHeight() CSS Height + Padding

$().outerHeight() = CSS Height + Padding + Border

  $().outerHeight(true) = CSS Height + Padding + Border + Margin

$("p span") = $("p").find("span") = $("span", "p")

When two margins touch, the larger of the two margins are promoted to the parent. The child's is then cancelled out.

Delta, 1 is up, -1 is down.

$().toggle(fn1, fn2, fn3,...) - Toggle takes multiple functions as arguments. On each click of the matched element, the next function is trigger.