Tagged “aspectratio”

I’m wary of list-based clickbait – and Adam’s recent 6 CSS snippets every front-end developer should know in 2023 feels like that – however I like this modern and minimal approach to creating a circle. I’ve previously seen aspect-ratio: 1 used to create a square box and it’s a lovely shorthand for “make width and height equal”. It makes sense that you can use it for a circle too, just by adding some border-radius.

Recently I’ve noticed some developers recommending using the CSS aspect-ratio property directly on images. My understanding of aspect-ratio was that it’s not so much intended for elements like img which already have an intrinsic aspect ratio, but rather for the likes of div which do not. Furthermore, when the goal is to prevent the layout shift that can occur after an image loads we should supply our images with width and height HTML attributes rather than using CSS.

In this timely post, Jake helpfully explains how width and height attributes are used by CSS as presentation hints to automatically set an aspect-ratio that will also, in cases where the attributes were set wrongly, fall back to the image’s intrinsic aspect ratio. Therefore, concentrating on HTML alone is ideal for our content images. My previous approach seems sound but I now know a little more about why.

Chris Coyier takes the new CSS aspect-ratio property for a spin and tests how it works in different scenarios.