How Can I Monitor CSS3 Transition Progress Using DOM Events?

CSS3 Transition Events: Monitoring Transition Progress with DOM Events

In CSS3, transitions provide a smooth and animated way to change the properties of an element over time. To track the progress of a transition, DOM events can be utilized to detect when it has started and ended.

W3C Standard

The W3C CSS Transitions Draft defines a DOM event that is triggered upon the completion of a transition. This event is specific to each property that undergoes a transition.

WebKit (Safari, Chrome, Opera)

For WebKit browsers, the webkitTransitionEnd event is fired when a transition completes. This event provides information about the transition, including the property that was transitioned.

Mozilla (Firefox)

In Mozilla, the transitionend event serves the same purpose as webkitTransitionEnd. The event type is consistent across Firefox, Opera, and WebKit.

Opera

Opera also supports the oTransitionEnd event, which occurs at the completion of a transition.

Internet Explorer

Internet Explorer triggers the transitionend event when a transition completes. It's important to note that if the transition is removed before completion, the event will not be fired.

Example Usage

To monitor the progress of a CSS3 transition using Javascript, an event listener can be attached to the appropriate DOM event. For example:

box.addEventListener('transitionend', function(event) {
  alert('Finished transition!');
}, false);

By leveraging these transition events, developers can synchronize actions with the completion of CSS3 transitions, creating more responsive and engaging user interfaces.

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