One size should fit all?
In modern web development, there is less and less reason to use fix sizing for an element, especially when it's a content wrapper.
We don't float down here anymore
I just realised I can't tell when was the last time I used the float property. There are so many other ways to align items without any fuss!
Convenient CSS naming conventions
I often run into the problem where I see the same class name being reused on different parts and context of the website, but when 1 out of the 3 properties don't match with the design, developers just use inline styling to override the desired rule.
font-family: "Open Sans";
Let's talk about units
There is a life beyond pixels and percentages. Using
pxunits is fine in certain cases, the real mistake is using absolute instead of relative units.
Variable fonts are awesome, but unnecessary usage of
font-variation-settingswill eventually break your styles.