csstdg5figs/19-animation/no0or100.html at main · meyerweb/csstdg5figs · GitHub

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<!DOCTYPE HTML>
<html lang="en-US">
<head>
<meta charset="utf-8">
<title>Animation without to or from keyframe selectors</title>
<link href="../styles/style-edit.css" rel="stylesheet">
<style>
div{
    padding: 20px;
    margin: 20px;
    color: white;
    font-family: sans-serif;
    border: 1px black solid;
 }
</style>
</head>
<body>
<style contenteditable id="editme">div {--bgcolor: red;
    animation: change_bgcolor infinite 10s alternate;
    background-color: var(--bgcolor);
}
@keyframes change_bgcolor {
    45% {
        background-color: green;
        border-width: 10px;
    }
    55% {
        background-color: blue;
        border-width: 20px;
    }
}
</style>
<div>This animation behaves as if was written:
<pre> @keyframes change_bgcolor {
  0% { background-color: var(--bgcolor); border-width: 1px;}
  45% { background-color: green; border-width: 10px; }
  55% { background-color: blue;  border-width: 20px;}
  100% { background-color: var(--bgcolor); border-width: 1px;}
}</pre></div>
<p>Change the "red" to "yellow" in the CSS code block for the <em>div</em></p>
</body>
</html>