CSS transition-timing-function

• transition
• transition-duration
• transition-delay
• transition-property
• animation
• animation-timing-function
• CSS3 Properties
• CSS properties

The CSS transition-timing-function property allows you to specify how a transition will change speed throughout its duration. These effects are commonly called easing functions.

The transition-timing-function is specified using a cubic bézier curve, which is defined by four control points; P₀, P₁, P₂, and P₃. The points P₀ and P₃, which represent the start and end of the transition cycle, are always set to (0,0) and (1,1) repectively.

The transition-timing-function property includes a number of keywords that can be used as a quick way to get a nice transition. Alternatively, you can use the cubic-bezier keyword to specify your own cubic-bézier curve.

The examples on this page include browser-specific properties that start with extensions such as -webkit-, -moz-, etc. This is for browser compatibility reasons. See the bottom of this article for more on this.

Syntax:	`transition-timing-function: ease \| linear \| ease-in \| ease-out \| ease-in-out \| cubic-bezier(<number>, <number>, <number>, <number>) [, ease \| linear \| ease-in \| ease-out \| ease-in-out \| cubic-bezier(<number>, <number>, <number>, <number>)]*`
Example	`transition-timing-function: ease-out /* W3C / -webkit-transition-timing-function: ease-out / Safari & Chrome / -moz-transition-timing-function: ease-out / Firefox / -ms-transition-timing-function: ease-out / Internet Explorer / -o-transition-timing-function: ease-out / Opera */` Note that this example includes various CSS extensions in addition to the W3C CSS3 property. This is for browser compatibility.
Try it yourself!	<!DOCTYPE html> <html> <head> <title>Example of the CSS3 animation-name Property</title> <style> .resize { background-color: orange; width:150px; height:20px; font-size:1em; font-family:Verdana,Arial,Helvetica,sans-serif; transition-property: width, height, font-size, font-weight, background-color; transition-duration: 1s; transition-timing-function: cubic-bezier(0.25, 0.1, 0.25, 1.4); transition-delay: 0s; -webkit-transition-property: width, height, font-size, font-weight, background-color; -webkit-transition-duration: 1s; -webkit-transition-timing-function: cubic-bezier(0.25, 0.1, 0.25, 1.4); -webkit-transition-delay: 0s; -moz-transition-property: width, height, font-size, font-weight, background-color; -moz-transition-duration: 1s; -moz-transition-timing-function: cubic-bezier(0.25, 0.1, 0.25, 1.4); -moz-transition-delay: 0s; -ms-transition-property: width, height, font-size, font-weight, background-color; -ms-transition-duration: 1s; -ms-transition-timing-function: cubic-bezier(0.25, 0.1, 0.25, 1.4); -ms-transition-delay: 0s; -o-transition-property: width, height, font-size, font-weight, background-color; -o-transition-duration: 1s; -o-transition-timing-function: cubic-bezier(0.25, 0.1, 0.25, 1.4); -o-transition-delay: 0s; } .resize:hover { width:370px; height:200px; font-size:2.3em; font-weight:bold; background-color: lemonchiffon; } </style> </head> <body> <div class="resize">Hover over me...</div> </body> </html>
Possible Values:	ease The ease function is equivalent to `cubic-bezier(0.25, 0.1, 0.25, 1.0)`. linear The linear function is equivalent to `cubic-bezier(0.0, 0.0, 1.0, 1.0)`. ease-in The ease-in function is equivalent to `cubic-bezier(0.42, 0, 1.0, 1.0)`. ease-out The ease-out function is equivalent to `cubic-bezier(0, 0, 0.58, 1.0)`. ease-in-out The ease-in-out function is equivalent to `cubic-bezier(0.42, 0, 0.58, 1.0)`. cubic-bezier Specifies a cubic-bézier curve. The four values specify points P₁ and P₂ of the curve as (x1, y1, x2, y2). All values must be in the range [0, 1] or the definition is invalid.
Initial Value:	`ease`
Applies to:	All elements, and the `:before` and `:after` pseudo elements
Inherited:	No
Media:	Interactive

Browser Compatibility

At the time of writing, CSS3 was still under development and browser support for many CSS3 properties was limited or non-existent. For maximum browser compatibility many web developers add browser-specific properties by using extensions such as -webkit- for Safari and Google Chrome, -ms- for Internet Explorer, -moz- for Firefox, -o- for Opera etc. As with any CSS property, if a browser doesn't support a proprietary extension, it will simply ignore it.

This practice is not recommended by the W3C, however in many cases, the only way you can test a property is to include the CSS extension that is compatible with your browser.

Be aware that if you choose to use the proprietary CSS extensions in a live environment, your code will not pass any W3C CSS validation, as the browser-specific properties are not valid W3C properties.

Many of the CSS3 examples on this website include these browser specific properties. If they weren't included, most of the examples wouldn't work for most users (at least, not until possibly years after the article was written).

The major browser manufacturers are working to support the W3C properties, and eventually, you will be able to omit these browser-specific properties.

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CSS transition-timing-function

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