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<html><head><style>div { background-color: red; width: 100px; aspect-ratio: 3/2;}</style></head><body><h3>Aspect-ratio property</h3><div>Hello</div><p>Aspect ratio is width/height.</p><p>Aspect-ratio of 3/2 and width set to 100px makes height of red box 2/3 of width in this case.</p></body></html>