So? Just a couple months ago it only worked on mobile Chrome. Firefox is usually next after Chrome, but Safari is usually far behind that. Not this time.
In my opinion, the latest several versions of every major browser - is pretty sufficient for certain features. Especially if you implement graceful degradation, so that browsers that don't support the feature can fall back on an older feature that is more widely supported.
Only render the feature if it's supported by the browser, render nothing or graceful degradation if it isn't.
It's common practice
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That's right! You can find more information about subgrids on MDN.
But it only works on FF 71...
So? Just a couple months ago it only worked on mobile Chrome. Firefox is usually next after Chrome, but Safari is usually far behind that. Not this time.
IMO, I think it's a bad practice to run a code that only works perfectly on certain browsers. But alas, only time will tell.
In my opinion, the latest several versions of every major browser - is pretty sufficient for certain features. Especially if you implement graceful degradation, so that browsers that don't support the feature can fall back on an older feature that is more widely supported.
Only render the feature if it's supported by the browser, render nothing or graceful degradation if it isn't.
It's common practice