Detailed graphic explanation of Clip-path to implement button flowing border animation

1. To achieve the effect

2. To achieve the steps

• Add div tag

<div>苏苏_icon</div>

• Add style

div {
  position: relative;
  width: 220px;
  height: 64px;
  line-height: 64px;
  text-align: center;
  color: #fff;
  font-size: 20px;
  background: #55557f;
  cursor: pointer;
  border-radius: 10px;
}

• Add front and back pseudo-elements to the div. In order to facilitate distinction, set the border colors of the front and rear pseudo-elements to be different.

div::after,
div::before {
   content: "";
   position: absolute;
   width: 240px;
   height: 84px;
   border: 2px solid #55557f;
   border-radius: 10px;
 }
div::before{
 border: 2px solid orange;
}

• Modify the positioning of the pseudo-element

div::after,
div::before{
 + left: calc(110px - 120px);
 + top: calc(32px - 42px);
}

• It can be abbreviated as inset

inset attribute: used to set left/right/bottom/top

div::after,
div::before{
 - left: calc(110px - 120px);
 - top: calc(32px - 42px);
 - inset: -10px;
}

• to add animation effects to pseudo elements to achieve Variations of clip-path

clip-path: The clip-path CSS property uses clipping to create the displayable area of ​​an element. Parts within the area are displayed and parts outside the area are hidden. inset() defines an inset rectangle.

• Syntax:

clip-path: inset(20px 50px 10px 0 round 50px);

• Explanation:

When all four parameters are provided:

They represent the top, right, bottom, and left offsets inward from the reference box, which define where the edges of the inserted rectangle are inserted. These parameters follow the syntax of margin shorthand, allowing you to set one, two, or four values ​​for all four illustrations.

Optional border-radiu parameter:

Use border-radius shorthand syntax to define rounded corners for the inserted rectangle

• We try to set inset on the pseudo element

div::after,
div::before{
  + clip-path: inset(0 0 98% 0);
}

div::after,
div::before{
  + clip-path: inset(0 98% 0 0);
}

div::after,
div::before{
  + clip-path: inset( 98% 0  0 0);
}

div::after,
div::before{
 + clip-path: inset(0  0 0  98% ) ;
}

• Add animation

##

div::after,
div::before{
  + animation: pathRotate 3s infinite linear;
}

@keyframes pathRotate {  0%,  100% {
    clip-path: inset(0 0 98% 0);
  }  25% {
    clip-path: inset(0 98% 0 0);
  }  50% {
    clip-path: inset(98% 0 0 0);
  }  75% {
    clip-path: inset(0 0 0 98%);
  }
}

Add animation delay to the rear pseudo-element to form Parallax effect
• 

animation-delay: The

CSS property specifies the time to wait from applying animation to an element to starting the animation. quantity. The animation can start later, immediately from the beginning, or immediately in the middle of the animation.

Positive values ​​indicate that the animation should start after the specified amount of time has passed. The default value of 0s means the animation should start immediately after application.

Negative values ​​cause the animation to start immediately, but midway through its loop. For example, if you specify a -1s animation delay time, the animation will start immediately, but 1 second after the animation sequence begins. If you specify a negative value for the animation delay but the start value is implicit, the start value is taken from the moment the animation is applied to the element.

div::after {
 animation-delay: -1.5s;
}

Copy after login

Remove the border color value setting of the front pseudo element

-div::before {
 -  border: 2px solid orange;
-}

Add hover event to div Done~

div:hover {
  filter: brightness(1.5);
}

div{	/* 添加过渡效果 */
	transition: all 0.5s;
}

3.实现代码

  
    
    
  

  
  
  
    <div>苏苏_icon</div>