Revisiting user-scalable=no

1. How can a user be scalable no?
2. What does user scalable no do?

How can a user be scalable no?

The user-scalable="no" parameter inside the content attribute of <meta name="viewport"> element disables zooming on a page. The maximum-scale parameter limits the amount the user can zoom. This is problematic for people with low vision who rely on screen magnifiers to properly see the contents of a web page.

What does user scalable no do?

The user-scalable attribute defines whether users can scale (zoom) the page content on mobile. By default, scaling is on, but if user-scalable is set to '0' or 'no' then this will prevent users from zooming, which negatively affects user experience (in most cases).