现场演示：我的 HTML 文档

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Example of CSS background Property Animation</title>
<style>
.animated {
    width: 300px;
    height: 175px;
    background: url("/examples/images/sun.png") no-repeat -50px -50px black;
    background-size: 10%;
    -webkit-animation: test 4s infinite; /* Chrome, Safari, Opera */
    animation: test 4s infinite;
}
/* Chrome, Safari, Opera */
@-webkit-keyframes test {
	50% {	
		background-color: floralwhite;
		background-position: center;
		background-size: 40%;
	}
}
/* Standard syntax */
@keyframes test {
    50% {	
		background-color: floralwhite;
		background-position: center;
		background-size: 40%;
	}
}
</style>
</head>
<body>
	<p><strong>Warning:</strong> CSS Animations do not work in Internet Explorer 9 and earlier versions.</p>
	<p><strong>Note:</strong> Among all the individual background properties only the background-color, background-position, and background-size properties are animatable in CSS. See the CSS <a href="https://www.appwang.com/css-reference/css-background-property.php" target="_top">background</a> shorthand property for details.<p>
	<div class="animated"></div>
</body>
</html>