More spec proposals == good for your career.
Shipping a feature (even if it's non-standard) == good for your career.
Ensuring standard-compatibility == noop.
Source: I used to be a browser dev annoyed by how Chrome kept shipping non-standard features.
As long as Chrome has > 80% market share, the more non-standard features the ship, the more they cement their position.
Same as IE6, which was intentionally non-standards. Sites would be designed to work in IE, and would not work on Netscape.
Considering how much spying and how much lock-in Chrome provides for Google, anything that makes devs design for Chrome only is a huge advantage.
More spec proposals == good for your career.
Shipping a feature (even if it's non-standard) == good for your career.
Ensuring standard-compatibility == noop.
Source: I used to be a browser dev annoyed by how Chrome kept shipping non-standard features.