Which browser are you talking about that renders everything correctly? Are you using a Servo-based browser? Is there even a Servo-based browser that someone can easily download and use?

Servo themselves say they only pass 55.8% of tests[1]. This thread[2] says Servo doesn't support SVG[2] as of Nov 2022.

[1] https://wpt.servo.org/

[2] https://old.reddit.com/r/browsers/comments/z2d7pr/servo_base...