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No more pixel rounding issues!

One line of code that looks strange and confusing. You may think it's not even CSS but it will save you many times in the future:

.container {
width: calc-size(auto,round(down,size,1px));
/* works with height as well */

It will make sure the width of your element is always an integer! No more decimal and rounding issues!

The behavior of width:auto with an upgrade.

No browser support yet but you can test it on the latest Chrome with the experimental flag enabled:

See the Pen width: auto with pixel rounding by Temani Afif (@t_afif) on CodePen.

If you are explicitly setting a size you can use the following which is widely supported:

.container {
width: round(down,X,1px); /* instead of width: X */

/* X can be anything (100%,10rem,50vw,45cqi, etc) */