A comprehensive list of all the CSS properties supported in Safari including "a number of properties that are not supported for developer use."
Lots of new features landing in Safari, and it’s worth paying attention to the new icon requirements now that websites can be added to the dock:
To provide the best user experience on macOS, supply at least one opaque, full-bleed
maskablesquare icon in the web app manifest, either as SVG (any size) or high resolution bitmap (1024×1024).
Good to see Google, Mozilla, and Apple collaborating on fixing cross-browser CSS compatability issues:
You can track progress here.
Straight from the horse's mouth, advice for web developers on how the iPhone's browser renders pages. I'm very intrigued to find out how it handles liquid designs with no set min-width.
Using the CSS trinity of feature queries, logical properties, and unset.