Dropping iOS 15 & other old browsers in July 2025

[a_lilian]

@david

Our headline here is “iOS 15”, because that’s the most commonly-used browser that is missing these features. But the change also applies to other browsers which are missing the same features.

For anyone who’s curious about Chrome specifically, it looks like Chrome 119 (November 2023) is the cutoff:

• Relative color syntax was implemented in Chrome 119 (November 2023)
• Subgrid was implemented in Chrome 117 (September 2023)
• Lookbehind regex was implemented in Chrome 62 (October 2017)