Direct answer
What these Screen & Display browser tests can tell you
These tests combine browser-reported CSS dimensions and animation timing with user-controlled visual patterns. They can reveal repeatable observations such as an unchanging pixel, visible banding or a refresh estimate under the current browser and display settings.
Useful starting points
- A pixel, color step or gradient looks unusual
- Reported screen, viewport or scaling values need explanation
- Browser animation timing needs a repeatable refresh estimate
Evidence shown in the browser
- CSS screen, viewport, color-depth and pixel-ratio values
- requestAnimationFrame timing while the tab is visible
- Manual solid-color, grayscale and gradient inspection
Important limit
A browser cannot certify physical panel resolution, exact monitor refresh rate, factory color accuracy, HDR capability, pixel warranty eligibility or repair needs.
For a clearer comparison, repeat the same action, change one relevant condition at a time, and record the browser, operating-system family, date and exact visible result. Use the page title and canonical URL when sharing the observation; do not describe a browser result as hardware certification.
Read the testing methodology or review our source and correction standards.
Focused tests
Choose a Screen & Display test
Open the page that matches the observation you want to reproduce.
Screen Resolution Test
Read CSS screen size, available area, viewport, pixel ratio, estimated physical pixels, color depth and orientation.
Open test →SCRefresh Rate Test
Estimate display refresh rate from requestAnimationFrame timing after a three-second warm-up and five-second sample.
Open test →SCDead Pixel Test
Inspect the display manually with solid black, white, red, green, blue, gray or custom colors in an ad-free fullscreen mode.
Open test →SCStuck Pixel Test
Use controlled solid colors to look for pixels that remain fixed on one subpixel color.
Open test →SCScreen Color Test
Display solid colors, grayscale steps, black level and white level patterns for a practical visual check.
Open test →SCGradient Test
Display grayscale and RGB gradients to look for visible banding or abrupt tonal transitions.
Open test →SCColor Depth Test
Show browser-reported color and pixel depth with a visual gradient reference.
Open test →SCScreen Orientation Test
Track the browser-reported orientation type, angle and viewport while you rotate or resize the device.
Open test →SCPrinter Test Page
Open a clean print sheet with text, grayscale, color, alignment and margin references using your browser print dialog.
Open test →