Ladybird's approach has been to start with a somewhat naive implementation of features, then choose popular websites and apps and just continuously iterate to make them gradually look better, by fixing the parts that stand out. This pragmatic approach means that their supported feature set, while nowhere near 100%, can decently render 90% of websites due to being aligned with the most commonly used features.
Here's Wikipedia: https://i.imgur.com/IshNWU2.png
Ladybird implements far more web technologies than more well-funded, longer-running alternative browser projects.
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.
[2] https://old.reddit.com/r/browsers/comments/z2d7pr/servo_base...
For the mainstream browser engines, yes, but if you're starting a browser from scratch the amount of stuff you have to implement is massive and cannot be implemented in the span of even a couple of years.
