<p>Every single visual experience that has a bounding plane has to deal with aspect ratios, whether that's a photo through a 1:1 ratio medium format camera or a 16:9 ratio 4k movie. If there's a visual bounding box around the scene then everything in the scene must deal with the ratio of the width to the height.</p>
<p>16/9 Aspect Ratio. This is a test to see if the new CSS aspect-ratio property actually works.
<p>CSS is one of the only visual systems that has no concept of aspect ratios despite the performance benefits of knowing the aspect of a block before the contents of the block are available. If you know the aspect ratio of a block, and you know the width of the page, then you can render the block immediately because you only need <b>one</b> dimension to render both.</p>
<p>10/2 Aspect Ratio. This is a test to see if the new CSS aspect-ratio property actually works.