Chrome

1
Open DevTools via one of these methods: Windows: Ctrl+Shift+I or F12 / Mac: Cmd+Opt+I. Right-click on page > Inspect > Click the Toggle Device icon. ...
2
Select the device you'd like to emulate. Refresh the page to view the mobile page layout.
3
Select Edit to add to emulated devices. ( Device settings cheat sheet)
Inspecting website elements using a Chrome browser on your iPhone is simple. Just launch the Chrome browser on your iPhone and visit a website. You must type view-source: before the HTTP or HTTPS in the address bar. Here, reload the page to view the full inventory.