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HTML Guide for user-scalable

Consider avoiding viewport values that prevent users from resizing documents.

viewport
meta
user-scalable
maximum-scale

A <meta name="viewport"> element has been found where the allowed values for the viewport prevent users from zooming and scaling the document.

The user-scalable="no" parameter 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. Consider relaxing these values in order to allow users to resize the documents.