Beispiel:CSS-custom-props-4.html

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<!DOCTYPE html>
<html lang="de">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" media="screen" href="./Beispiel:SELFHTML-Beispiel-Grundlayout.css" />
  <title>Timer mit custom properties</title>
  <style>
.time-bar div {
  height: 1em;
  background: linear-gradient(to bottom, #ffebe6, #c32e04);
  animation: roundtime calc(var(--duration) * 1s) steps(var(--duration)) forwards;
  transform-origin: left center;
}

@keyframes roundtime {
  to {
    /* More performant than animating `width` */
    transform: scaleX(0);
  }
}

  </style>
</head>

<body>
  <h1>Timer mit custom properties</h1>

<div class="time-bar"  style="--duration: 9;">
  <div></div>
</div>

</body>
</html>
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