The caniuse data shows that the number of APIs Chrome supports that Safari doesn't is at least 3 times higher than the opposite, and among the APIs Safari supports that Chrome don't, most are either too old and useless, too new and equally useless, or very small compared to the massive APIs listed to Chrome advantage.

I really don't see how that translates to "Safari and Chrome trading blows" and Safari taking over Chrome by "50%"?

Also, here is more representative dataset, where you can see that Safari has more than 5 times the number of API failures compared to Chrome, and 3 times compared to Firefox (in the stable channel): https://wpt.fyi/results/?label=master&label=experimental&ali...