How to hide web address in web viewer?

in my app, i put my data on html and link to web viewer, when my phone turn off wifi and 4G, it will show web address, how i can hide website address in web viewer ?
Thx all.

You haven’t hosted your website, right?
If no, then users won’t be able to access your html page that’s all, because the html file is in your device and isn’t on their device, but sometimes this can happen 'cause data might be saved in user’s device storage which he/she can access, to prevent this use Airtable/Firebase or check if device is online you can use this block: device is online? In device and put it in a ‘if statement’ and do the necessary action.