> And the way box shadows are implemented on the web is similar to gradients: they use a linear transition.<p>This is wrong. Yes, linear <i>gradients</i> are everywhere, even in nearly every professional graphic design tool, which is unfortunate since they are almost always the wrong choice. Box shadows, on the other hand, tend to be based on Gaussian blurs, which certainly doesn’t create a linear transition. This is also the way the CSS box-shadows spec say they should work: <a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-blur" rel="nofollow">https://drafts.csswg.org/css-backgrounds-3/#shadow-blur</a>
As soon as I scrolled to the "Easing for box shadows" section where the examples were visible, my browser became laggy and dropped from 60Hz framerate to about 15Hz. Use these with caution, and test on a range of devices your visitors are using.
Thanks for featuring my little shadow tool! I'm glad it's useful!<p>There's a figma plugin out now as well: <a href="https://www.figma.com/c/plugin/788830704169694737/SmoothShadow" rel="nofollow">https://www.figma.com/c/plugin/788830704169694737/SmoothShad...</a>
On Firefox this website lags from the get go. I think you should have all your ducks in a row before offering advice on features related to what you're talking about.