Frosted glass looks great. It gives web interfaces a premium, tactile quality that solid color blocks rarely match. But from an accessibility standpoint, it can easily become a nightmare. When text sits on a semi-transparent panel, its contrast is never static. It shifts as background elements, images, or gradients move underneath during scroll.
The Moving Target Problem
Most standard accessibility scanners evaluate contrast by comparing two static hex codes. That works fine for flat pages, but fails with glassmorphism. Since the background behind your text changes dynamically, a header that passes contrast guidelines in its default position might become completely unreadable a few scroll lines later.
Practical Steps for Compliance
You do not need to abandon the frosted look to build an accessible site. Try these three adjustments to protect your text legibility:
- Boost the overlay opacity: A white or dark glass tint with at least 45% opacity helps mute busy background patterns.
- Add a crisp boundary border: A thin, 1px border with a solid accent color gives low-vision users a clear outline of the component.
- Use backdrop-filter blur: Apply a generous blur radius (20px to 30px) using the CSS
backdrop-filter: blur()property. This diffuses the pixels underneath, turning chaotic background patterns into a soft, blended color wash.
By checking contrast across different background regions using tools like GlassLint, you can build translucent designs that are both visually appealing and fully accessible.