Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
385 views
in Technique[技术] by (71.8m points)

html - CSS border color switch animation: "from" color not correct

I built a css animation and part of it is changing the border color of a div.

I'm using from and to values. The border should blink white and blue but instead of white I get a light blue.

I built a minimal snippet to demonstrate this. Any idea what I'm doing wrong?

.switch {
  width: 100px;
  height: 100px;
  border: 5px solid white;
  -webkit-animation: switch-animation 2s steps(2, start) infinite;
  animation: switch-animation 2s steps(2, start) infinite;
}

@keyframes switch-animation {
  from {
    border-color: white;
  }
  to {
    border-color: blue;
  }
}
@-webkit-keyframes switch-animation {
  from {
    border-color: white;
  }
  to {
    border-color: blue;
  }
}
<html>
  <head></head>
  <body>
    <div class="switch"></div>
  </body>
</html>
See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

According to the documenation steps(2,start) will give this timing output:

enter image description here

So you will spend 0 time on the first state, half the time on the 50% (light blue) and half the time on the 100% (blue). You will have a similar logic using end instead of start where you will spend 0 time on the last state. Actually what you are looking for is the frames function but it's actually under draft and using frames(2) you will do exactly what you want:

enter image description here

An easy fix is to change the values of the keyframes to force each color to stay half the animation without using steps

.switch {
  width: 100px;
  height: 100px;
  border: 5px solid white;
  animation: switch-animation 2s infinite linear;
}

@keyframes switch-animation {
  0%,50% {
    border-color: white;
  }
  50.1%,100% {
    border-color: blue;
  }
}
<div class="switch"></div>

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...