CSS Transitions

CSS transitions allows you to change property values smoothly, over a given duration.

Mouse over the element below to see a CSS transition effect:

Hover Me

In this chapter you will learn about the following properties:

• transition
• transition-delay
• transition-duration
• transition-property
• transition-timing-function

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How to Use CSS Transitions?

To create a transition effect, you must specify two things:

• The CSS property you want to add an effect to
• The duration of the effect

Note: If the duration part is not specified, the transition will have no effect, because the default value is 0.

The following example shows a 100px * 100px red <div> element. The <div> element has also specified a transition effect for the width property, with a duration of 2 seconds:

Output :

Change Several Property Values

The following example adds a transition effect for both the width and height property, with a duration of 2 seconds for the width and 4 seconds for the height:

Output :

Specify the Speed Curve of the Transition

The transition-timing-function property specifies the speed curve of the transition effect.

The transition-timing-function property can have the following values:

• ease – specifies a transition effect with a slow start, then fast, then end slowly (this is default)
• linear – specifies a transition effect with the same speed from start to end
• ease-in – specifies a transition effect with a slow start
• ease-out – specifies a transition effect with a slow end
• ease-in-out – specifies a transition effect with a slow start and end
• cubic-bezier(n,n,n,n) – lets you define your own values in a cubic-bezier function

The following example shows some of the different speed curves that can be used:

Output 3:

Transition + Transformation

The following example adds a transition effect to the transformation.

Output :

More Transition Examples

The CSS transition properties can be specified one by one, like this:

Output:-: