[user-scalable="no"] is used in the <meta name="viewport"> element or the [maximum-scale] attribute is less than 5.
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What is [user-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.
Why people using [user-scalable='no']
People used <meta name="viewport" content="user-scalable=no"> primarily to prevent users from zooming in on a website, aiming to maintain a consistent design across all devices by forcing a specific text size or preventing visual disruption for apps like games or maps. However, this practice is now widely considered harmful as it negatively impacts accessibility for users with low vision, coordination issues, or those who simply want to zoom in for readability or to view details, and it is often ignored by modern browsers.
Why [user-scalable='no'] Is Harmful and Should Be Avoided
Accessibility Problems:
Disabling zoom directly harms users with visual impairments, such as low vision, who rely on zooming to read text and view content comfortably.
User Inconvenience:
Many users find it necessary to zoom in to read small text, find specific information, copy text, or show something on their screen to someone else.
Not a Universal Fix:
Modern web browsers and devices often ignore user-scalable=no or offer users settings to override it, making it an unreliable method for controlling the user experience.
Ignores Best Practices:
Web accessibility guidelines, like the Web Content Accessibility Guidelines (WCAG), recommend that pages support resizing up to 200% and should not have zoom disabled.
You can simply remove the [user-scalable='no'] property from the viewport meta tag in the head section of your HTML document. The viewport meta tag should look something like this:
<meta content='width=device-width, initial-scale=1, user-scalable=1, minimum-scale=1, maximum-scale=5' name='viewport'/>
After changing the existing viewport tag with the above code, save your theme. And re-run the page speed insight check.
Now the error in page speed insight will be fixed. 👌
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