It's funny Mozilla has a blog that renders about 20px to wide on mobile. The company that makes most of the web standards. Something ironic about that
It doesn’t render at all on my ipad pro with iOS 13.7. Actually it does render and then immediately turns black. People give w3schools a lot of flak but at least it renders and is usable on my ipad unlike the MDN docs. Do we no longer care about backwards compatibility, it seems not and that’s shameful.
FWIW the mdn blog works just fine without js so maybe try it while disabling javascript.