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Here it is for optional chaining: https://caniuse.com/?search=optional%20chaining

+90% of users can use it, which is probably not high enough IMO.

For end user/consumer software, 90% is nowhere near high enough. In b2b/enterprise settings you have levers to help you push that number higher through IT policy, but end users will absolutely attempt to visit your cutting edge 2022 website on the iPad 3 they've used lightly.

My rule of thumb has been that if it's an app core to someone's job or life management, it needs to be functional for hardware/software going back 5-7 years, less if it's just entertainment or something.

Maybe caniuse.com should show "age of support" or something like that, to show you the newest possible device you're cutting off by using the feature.

The view is not ideal but "date relative" provides some indication.

Anything older than 2020 doesn't support optional chaining. Which makes sense, given it's apparently an ES2020 feature.

Perfect, date relative is exactly what I wanted!

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