Text overflow
When the label is too long for the available horizontal space, it wraps to form another line.
Animation
A tooltip fades in and out when showing and hiding, and slides a short distance from the source to indicate its origin. The direction of the slide (left, right, top, bottom) depends on the placement of the tooltip. The animation attributes (duration, easing, offset) are the same whether it's showing or hiding.
Immediate or delayed appearance
Tooltips attached to help icons appear immediately. For conventional UI elements where a tooltip appearing immediately would be intrusive, delay appearance with a warmup period.
Warmup and cooldown
The warmup period is a global timer that requires the cursor to remain on a UI element for the allotted time before a tooltip appears. Once this period is complete, a tooltip appears instantly on any hovered-upon UI element until the cursor is in an area that does not trigger a tooltip for the duration of the cooldown period.