Is there an "Inspect Element" option on any browser on Android?
You can use Dago Browser (Web Inspector). It allows you to inspect webpages and works flawlessly on my MIUI8.

From its description,


  Dago Browser is a web browser with web inspector that can be opened by swipe right from a web browser page and choosing Inspect Element. Once open, it highlights the node on the page as it is selected in the hierarchy. [...]