[xprueg]

You can connect your apple device via cable to your Mac and open the inspector[0] of any open website in Safari.

For a quick look without a second device there is eruda[1], which enables an inspector via a JavaScript call[2].

[0] https://developer.apple.com/library/archive/documentation/Ap...

[1] https://github.com/liriliri/eruda

[2] javascript:(function () { var script = document.createElement('script'); script.src="https://cdn.jsdelivr.net/npm/eruda"; document.body.append(script); script.onload = function () { eruda.init(); } })();