What are transition, transform and animation in CSS3? The difference between the three

This chapter will introduce to you what transition, transform and animation are in CSS3? The difference between the three. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

transition

Transition allows css attribute values ​​​​to smoothly transition within a certain time interval. The syntax is as follows:

transition ： transition-property transition-duration transition-timing-function transition-delay [, ...]

Transition-related properties:

1. transition-property: used to specify the properties for executing the transition effect, which can be none, all or specific properties.

2. transition-duration: The duration of animation execution, in s (seconds) or ms (milliseconds).

3. transition-timing-function: Transformation rate effect, optional values ​​are ease|linear|ease-in|ease-out|ease-in-out|cubic-bezier (custom time curve).

4. transition-delay: used to specify the time when the animation starts to execute. The value is the same as transition-duration, but can be a negative number.

transform

transform is divided into 2D and 3D. Here we only introduce the more commonly used 2D transform. Its main It includes the following transformations: rotation rotate, distortion skew, scale scale and translation, and matrix transformation matrix. The syntax is as follows:

transform: rotate | scale | skew | translate |matrix;

Related properties of transform:

1. rotate Rotation
   The unit of rotate is deg degree, positive number means clockwise rotation, negative number means counterclockwise rotation.

2. scale Scale
   The value range of scale is 0~n. If it is less than 1, it means to reduce it, otherwise it means to enlarge it. For example, scale(0.5, 2) means that the horizontal direction is reduced by 1 times and the vertical direction is enlarged by 1 times. In addition, one direction can also be set through scaleX or scaleY.

3. skew Distortion
   The unit of skew is the same as rotate, which is deg degrees. For example, skew(30deg, 10deg) means that the horizontal direction is tilted 30 degrees and the vertical direction is tilted 10 degrees.

4. translate Offset
   Offset also includes horizontal offset and vertical offset. translate(x,y) moves horizontally and vertically at the same time (that is, the X-axis and Y-axis move simultaneously); translateX(x) only moves horizontally (X-axis moves); translateY(Y) only moves vertically (Y-axis move).

animation

Animation in CSS3 is controlled through a thing called Keyframes. The name starts with "@keyframes", followed by the "name of the animation" plus a pair of curly brackets "{}". In the brackets are some style rules for different time periods, a bit like how we write CSS styles. For a style rule in "@keyframes" that is composed of multiple percentages, such as between "0%" and "100%", the syntax is as follows:

@keyframes IDENT {
  from {
    Properties: Properties value;
  }
  Percentage {
    Properties: Properties value;
  }
  to {
    Properties: Properties value;
  }
}

或者全部写成百分比的形式： 
@keyframes IDENT {
  0% {
    Properties: Properties value;
  }
  Percentage {
    Properties: Properties value;
  }
  100% {
    Properties: Properties value;
  }
}

animation and transition have their own corresponding Attributes, then there are mainly the following types in animation: animation-name; animation-duration; animation-timing-function; animation-delay; animation-iteration-count; animation-direction; animation-play-state. Some of the properties are explained below:

1. animation-name keyframe name:
   is used to define the name of an animation, which is the name of the animation created by the previous keyframes , the default value is none, when the value is none, there will be no animation effect. If we want to attach several animations to an element at the same time, just separate them with commas.

2. animation-iteration-count Number of animation loops:
   The default is 1. If you want to loop infinitely, just set it to infinite.

3. animation-direction The direction of animation playback:
   It has only two values. The default value is normal. If set to normal, each cycle of the animation will play forward. ;The other value is alternate. Its function is to play the animation forward in the even-numbered times and in the reverse direction in the odd-numbered times.

4. animation-play-state Play state:
   It mainly has two values, running and paused, of which running is the default value. You can stop the currently playing animation through paused, and you can also replay the paused animation through running. This attribute is not commonly used.

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