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<html><head><style>h1 { font-size: 20vh;}</style></head><body><h1>Hello</h1><p>Resize the height of the browser window to see how the font-size of h1 changes.</p><p>1vh = 1% of viewport height.</p></body><!-- Mirrored from www.w3schools.com/css/tryit.asp?filename=trycss_unit_vh by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 21 Dec 2022 16:49:47 GMT --></html>