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ux-ui

Rule #7 – Give Users Control

By טוביה שיינפלד Sep 26, 2026 492 views

How do you let users control text size and contrast on a website?

An accessible interface lets users adjust text size, contrast, and colors to suit their personal needs. Test your site at a minimum zoom level of 200% (around 28px) to ensure content stays clear without layout breakage. Using relative units (rem/em) and supporting browser zoom guarantees a natural response to device or display changes.

Did you know:

Not all users see the same thing — give them control over text size, color, and contrast to improve readability and deliver a truly accessible user experience.

Different users prefer an interface tailored to their own comfort.
Especially when it comes to text, colors, and images – the ability to customize the display is an inseparable part of an accessible and enjoyable user experience.

Text Size – A Critical Parameter for Readability

People with partial or low vision often need larger, clearer text.
That's why it's recommended to test your site at a zoom level of at least 200% (approximately 28 pixels), and verify that content remains clear, accessible, and easy to navigate – without layout breakage, unnecessary scrolling, or clipped text.

Additional Customizations Worth Enabling:

  • Easy text resizing – for example, through font-size control buttons or automatic adjustment to the user's browser settings.
  • Contrast and color adjustments – such as switching to high-contrast mode, or adapting to light text on a dark background.
  • Scaling images, icons, and other elements – in a way that supports zoom without distorting the page layout.
  • Using relative units (rem / em) – which allow the interface to respond naturally to changes in device or browser settings.

A Personalized Experience – For Everyone

When you design an interface that allows personalization, you create a system that can accommodate a wide range of people, ages, and needs. This isn't just accessibility – it's a flexible, high-quality, and professional user experience.

Summary

Give users control – and you'll get an outstanding user experience.
Adapting text size, colors, and interface elements isn't an add-on – it's a fundamental part of building a comfortable, equitable, and enjoyable experience for all users.

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