That don't work with render only bug, safari has tons of them. And in that case, JS is useless. Because everything reports correct, only the screen messed up.

That don't work with render only bug, safari has tons of them. And in that case, JS is useless. Because everything reports correct, only the screen messed up. Another example, Android webview 69 on certain devices has a bug that will take down the whole app. There is no way you can workaround it without ua sniffing. Because a single try will take the whole app away.