CSS3 Transitions

The function of CSS3 Transitions is very straightforward: smoothly change the computed value of a CSS property from its old value to its new value. Moreover, changes in value resulting from changes in an element’s CSS class or pseudo-class also trigger transitions.

Consider the following markup:

img {
opacity: 1;
transition-property: opacity;
transition-duration: 2s;
transition-delay: 0s;
transition-timing-function: linear;

img:hover {
opacity: 0;

The effect of this is that when the user moves his or her mouse over the image, the image will fade out smoothly over 2 seconds starting immediately.

The transition properties that cause this to occur are:

  • transition-property – specifies which CSS properties are to be transitioned. The keyword “all” causes all animatable properties to transition when changed. The default value is “all.”
  • transition-duration – the time, in seconds or milliseconds, of the transition, starting after the transition-delay. The default value is zero, meaning that the transition is immediate.
  • transition-delay – the time, in seconds or milliseconds, after the value is changed before the transition starts. The time may be negative, in which case the transition starts part way through its duration. The default value is zero.
  • transition-timing-function – describes how the intermediate values of a transition are calculated. This allows a transition to change speed over its duration. The underlying function is a cubic Bézier curve; keywords match common functions. The default value is the keyword “ease,” a function that starts fast and slows down toward the end.

The benefits of CSS Transitions are their declarative definitions, making them easier than script, and they run—at least in IE10—asynchronously to the main processing thread resulting in smoother transitions and sites that are more responsive.

An interactive demo of CSS3 Transitions is available on the IE Test Drive site. The demo works in all browsers that support CSS3 Transitions, including IE10.

About mytechlifedays

Its been a wonderful learning period over the last 6 years in the IT industry , getting exposed to whole lot of technologies and ideas. The hurdles and the crisis that came along have been wonderful experience ... And now its time to pen them down so that let some others execute faster and easily with these information .....
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