Adds the class "toolkit-warn" on
this.element for a certain
period of time. It is used e.g. in TK.ResponseHandle or TK.Knob when the value
exceeds the range.
Adds the class
toolkit-warn to the given element and
sets a timeout after which the class is removed again. If there
already is a timeout waiting it gets updated.
||HTMLElement | SVGElement||
The DOM node the class should be added to.
The timeout in ms until the class should be removed again.
Gets fired when TK.Warning#warning was called.