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<!doctype html>
<title>CSS Borders: border-shape ellipse() radial-extent keywords reference</title>
<style>
.box {
width: 300px;
height: 400px;
margin: 50px;
background: green;
}
/* closest side: x = min(60, 240) = 60, y = min(80, 320) = 80 */
#closest { border-shape: ellipse(60px 80px at 60px 80px); }
/* farthest side: x = max(60, 240) = 240, y = max(80, 320) = 320 */
#farthest { border-shape: ellipse(240px 320px at 60px 80px); }
/* closest x, farthest y */
#closest-farthest { border-shape: ellipse(60px 320px at 60px 80px); }
/* farthest x, closest y */
#farthest-closest { border-shape: ellipse(240px 80px at 60px 80px); }
</style>
<div id="closest" class="box"></div>
<div id="farthest" class="box"></div>
<div id="closest-farthest" class="box"></div>
<div id="farthest-closest" class="box"></div>