Can I Apply A CSS Transition On Hover-out Only?
Answer : Here's one way to achieve this (put a bogus property none for transition property in :hover ): #inner2{ opacity:0; transition:opacity 2000ms; } #outer:hover #inner2{ opacity:1; transition:none; } http://jsfiddle.net/j716sbav/4/ Answer updated to incorporate @BoltClock's suggestion. Putting none instead of a bogus property is definitely more elegant. If you prefer not to specify the transition property more than once, you can apply the transition to :not(:hover) , but the caveat is that you need to swap all of the other declarations as well: #inner2{ opacity:1; } #outer:not(:hover) #inner2{ opacity:0; transition:opacity 2000ms; } Either of these will work, but if you don't want to deal with confusing inversions, stick with overriding via transition: none . Also note that CSS selectors represent states and not events, which means that it utilizes a :hover state rather than mouseover and mouseout events; however, a tra...