[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5

The user-scalable="no" parameter for the <meta name="viewport"> element disables browser zoom on a web page. The maximum-scale parameter limits the amount the user can zoom. Both are problematic for users with low vision who rely on browser zoom to see the contents of a web page.

How the Lighthouse browser zoom audit fails #

Lighthouse flags pages that disable browser zooming:

A page fails the audit if it contains a <meta name="viewport"> tag with either of the following:

• A content attribute with a user-scalable="no" parameter
• A content attribute with a maximum-scale parameter set to less than 5

How to avoid disabling browser zoom #

Remove the user-scalable="no" parameter from the viewport meta tag and make sure the maximum-scale parameter is set to 5 or greater.

Resources #

• Source code for [user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5 audit
• Zooming and scaling must not be disabled (Deque University)