<html>
<head>
<style>
h1 {
font-size: 15vmax;
}
</style>
</head>
<body>
<h1>Hello</h1>
<p>Resize the browser window (both width and height) to see how the font-size of h1 changes.</p>
<p>1vmax = 1vw or 1vh, whichever is larger.</p>
<p>The vmax unit is not supported in Edge 15 and earlier, nor in Safari 6.1 and earlier.</p>
</body>
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</html>