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

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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:

Lighthouse audit showing the viewport disables text scaling and 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 paramater set to less than 5

The Lighthouse Accessibility score is a weighted average of all the accessibility audits. See the Lighthouse accessibility scoring post for more information.

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.

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