Once you understand all this, you still need to KISS. Going overboard with clever CSS manipulation has two major drawbacks: 1) "Fragile" layouts, where simple

Once you understand all this, you still need to KISS. Going overboard with clever CSS manipulation has two major drawbacks: 1) "Fragile" layouts, where simple changes break the entire UI. 2) Broken javascript - as an eample, jQuery-UI uses the positioning in the DOM to calculate where to display some UI elements. Mixing relative and absolute positioning breaks these functions.