So far they're third going by the caniuse score, which is based on the features developers can use. Previously it last place.
I don't think it was the developer backlash that forced Apple to start releasing TP previews of Safari and progressing features. I was likely more of a gap between major versions (Safari 9.x vs 10.x)
Safari has actually had WebKit Nightlies for many years. The Technical Preview is just basically a semi-stable beta track (as opposed to the Nightlies which are of course nightly builds).
So far they're third going by the caniuse score, which is based on the features developers can use. Previously it last place.
I don't think it was the developer backlash that forced Apple to start releasing TP previews of Safari and progressing features. I was likely more of a gap between major versions (Safari 9.x vs 10.x)