Its hard to find these stats now (need to use Android Studio), but about 10% of android users are on Android v9 and below. Android 9 support was recently discontinued by Chromium, such that they cannot update past Chromium 138.

So, 10% of android users dont have web features beyond, at best, June 2025.

caniuse.com does not track this - they lump all Chrome for android together in the latest version.

This is painful as someone who wants to make use of some very useful, powerful new features, but is targeting people who are most likely to have old, slow, not-updated devices...

There seem to be updated stats here: https://composables.com/android-distribution-chart

Which seems to indicate about 4.8% are below Android 9.

But also, Firefox for Android still supports Android 8, of which there are 1.7% below.

There's a discussion to be made here about who is dropping support for these users, is it Google (and especially Apple, who doesn't allow other browsers on iOS) or the site owner? Especially given how insecure it is to use outdated browsers.