- Be very careful when using transition-property: all. You will get TransitionEnd events for properties that you didn’t expect to ever transition
- Be careful when using shorthand properties, because the number of triggered events varies between browsers
- Opera and IE don’t trigger events when a negative delay cancels out the duration
- WebKit has real issues with the priority of properties such as transition-property: margin, margin-left. Avoid this for now
- IE doesn’t support implicit transitions — for example, triggered for padding: 2em when font-sizechanges
- Firefox and Opera cannot parse transition-property: all, width
- Opera mixes up the priority of properties
- Transitions on pseudo-elements do not trigger TransitionEnd events
- IE 10 has a weird :hover bug when transitioning pseudo-elements
- The specification leaves a lot of room for improvement
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