This is grid (one of its many possible configurations at least). I should have called out the needed accompanying ‘display: grid’ (it’s hidden in the codepen)
Oh, I see. By the way, using var on grid (and another style value) can't be rendered by Opera Mini with extreme mode, isn't it?
min() is quite new and only in evergreen browsers.
Grid-auto-columns is not in IE but is in Opera Mobile. To be honest I’ve never tested in opera mini, but this could degrade pretty gracefully with a simpler fallback grid.
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