Responsive testing verifies that a website adapts properly to different viewport sizes—from large desktop monitors down to mobile phones. It catches layout breaks, overlapping elements, and content that becomes unreadable at certain widths.
Why responsive testing matters
Over half of web traffic comes from mobile devices. A site that looks great at 1440px but breaks at 375px loses visitors. Responsive testing catches these issues before users do.
Common responsive issues
- Horizontal scroll: Content wider than the viewport
- Overlapping elements: Text on top of images, buttons on top of buttons
- Tiny tap targets: Links and buttons too small for fingers
- Hidden content: Important elements pushed off-screen
- Broken navigation: Menus that don't collapse or expand properly
- Unreadable text: Font sizes that don't scale down
Breakpoints to test
Most projects use a standard set:
- Mobile: 320px, 375px, 414px
- Tablet: 768px, 834px
- Desktop: 1024px, 1280px, 1440px, 1920px
Don't just test at breakpoints—drag the viewport width to find issues between them.
Responsive testing approaches
- Browser DevTools: Resize the viewport manually
- Real devices: Test on actual phones and tablets
- Emulators: Simulate devices in software
- Side-by-side tools: Compare multiple breakpoints simultaneously
Testing responsiveness with Huddlekit
Huddlekit shows your site at multiple breakpoints side by side. Spot layout differences instantly, pin feedback at specific widths, and verify fixes across all sizes without switching tabs or devices.
