Once it is on your Home Screen, it opens with one tap and works without a connection. That includes a basement restaurant with no signal. Adding it costs nothing.
Safari, Chrome and Edge all work. The steps are almost the same in each.
Adding from browsers other than Safari has been possible since iOS 16.4 (March 2023).
On older iPhones, open the page in Safari.
If “Add to Home Screen” is not in the share menu, update iOS and your browser, then try again.
Chrome, Edge, Firefox and others all work.
A prompt may also appear at the bottom of the screen. You can add it from there.
Chrome and Edge can do this.
If the icon is not there, use the menu (⋮) → “Save and share” → “Install page as app”.
Desktop Safari and Firefox do not have this feature. Use a bookmark instead.
Delete the Home Screen icon the same way you delete any app. What you entered on the device is deleted with it.