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For example, I have this animation

@keyframes fade-out-50-in-70 {
  0% { opacity: 1; }
  50% { opacity: 0; }
  70% { opacity: 1; }
  100% { opacity: 1; }
}
.animate-fade-out-in {
  animation-name: fade-out-50-in-70;
  animation-timing-function: linear;
}

try to use this linear (linear(0, 0.5 35%, 1 70%);)function to achieve same thing

@keyframes fade-out-in {
  0% { opacity: 1; }
  50% { opacity: 0; }
  100% { opacity: 1; }
}
.animate-fade-out-in-2 {
  animation-name: fade-out-in;
  animation-timing-function: linear(0, 0.5 35%, 1 70%);
}

But I failed. how can I turn that into success?

div {
  background: red;
  width: 100px;
  aspect-ratio: 1/1;
}
@keyframes fade-out-50-in-70 {
  0% { opacity: 1; }
  50% { opacity: 0; }
  70% { opacity: 1; }
  100% { opacity: 1; }
}
.animate-fade-out-in {
  animation-name: fade-out-50-in-70;
  animation-timing-function: linear;
  animation-duration: 2s;
  animation-iteration-count: infinite;
}
@keyframes fade-out-in {
  0% { opacity: 1; }
  50% { opacity: 0; }
  100% { opacity: 1; }
}
.animate-fade-out-in-2 {
  animation-name: fade-out-in;
  animation-timing-function: linear(0, 0.5 35%, 1 70%);
  animation-duration: 2s;
  animation-iteration-count: infinite;
}
<div class="animate-fade-out-in">by @keyframes</div>

<div class="animate-fade-out-in-2">by timing fn</div>

2

Answers


  1. Make the keyframes easy by using 100% for opacity: 0 then the linear() function should also be easy to define

    @keyframes fade-out-50-in-70 {
      50% {
        opacity: 0;
      }
      70% {
        opacity: 1;
      }
    }
    
    @keyframes fade-out-in {
      100% {
        opacity: 0;
      }
    }
    .animate-fade-out-in {
      animation-name: fade-out-in;
      animation-timing-function: linear(0, 1 50%, 0 70%);
      animation-duration: 2s;
      animation-iteration-count: infinite;
    }
    
    .animate-fade-out-50-in-70 {
      animation-name: fade-out-50-in-70;
      animation-timing-function: linear;
      animation-duration: 2s;
      animation-iteration-count: infinite;
    }
    div {
      height: 100px;
      background: red;
    }
    <div class="animate-fade-out-in"></div>
    <div class="animate-fade-out-50-in-70"></div>
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  2. Why don’t you use cubic-bezier()?

    div {
      background: red;
      width: 100px;
      aspect-ratio: 1/1;
    }
    
    @keyframes fade-out-50-in-70 {
      0% {
        opacity: 1;
      }
      50% {
        opacity: 0;
      }
      70% {
        opacity: 1;
      }
      100% {
        opacity: 1;
      }
    }
    
    .animate-fade-out-in {
      animation-name: fade-out-50-in-70;
      animation-timing-function: cubic-bezier(0, 0.5, 0.35, 1);
      animation-duration: 2s;
      animation-iteration-count: infinite;
    }
    
    @keyframes fade-out-in {
      0% {
        opacity: 1;
      }
      50% {
        opacity: 0;
      }
      100% {
        opacity: 1;
      }
    }
    
    .animate-fade-out-in-2 {
      animation-name: fade-out-in;
      animation-timing-function: cubic-bezier(0, 0.5, 0.35, 1);
      animation-duration: 2s;
      animation-iteration-count: infinite;
    }
    <div class="animate-fade-out-in"></div>
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