the desired effect is as shown in the figure above
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<!--<link href="style.css" rel="stylesheet">-->
</head>
<body>
<svg class="demo" viewBox="0 0 100 100" style="width: 50%;background: white">
<circle cx="50" cy="50" r="10" fill="white"/>
</svg>
</body>
</html>Internet Explorer and Safari do not support SVG filters!
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