Found today while searching for answers to some coding questions:
Can I Use … ? Find out which browsers fully or partially support any given front-end web technology (such as
box-sizing: all browsers!).
Should I Prefix? For some CSS properties, we need to include extra versions for Chrome, Firefox, or both (using the prefixes
-moz-) — find out which properties still need these.
DiffChecker: Compare two text files. The differences between the two files (even spacing and tabs) are shown clearly with side-by-side highlighting.