If the question is to send it to the customer, let the customer pick up a browser and make the browser full screen, so that they can see the effect on the mobile phone without knowing how to use the browser itself, it is recommended to follow this idea:

1. Publish the mobile webpage that you want customers to preview to the public network, even if it is just a beta version. Tools like ngrok can directly publish your localhost to the public network. Usually you get an address like http://cc007c0b.ngriok.io.

2. Use the responsinator site, bring the address of your mobile website (you end up with something like this http://www.responsinator.com/?url=cc007c0b.ngriok.io), and just send this address to the customer.

The most convenient thing now is to use the mobile browsing mode on Chrome, or the responsive design mode on Firefox

F12 is enough

The styles seen by the Google Chrome mobile simulator are basically the same. Why not?

It is not used by me, but by customers. Customers need to be able to see the same effect as seen in the mobile browser no matter what browser they use. Customers do not necessarily have Google Chrome installed.

Ask customers to install chrome. . If you don’t pretend, don’t let him play.