Quick answer
What Gradient Test tells you
Display grayscale and RGB gradients to look for visible banding or abrupt tonal transitions.
- Observed here
- Grayscale gradient, RGB gradients, Color banding inspection.
- How to interpret it
- Visible steps in a displayed gradient can reflect the rendering path, display settings or panel behavior. A visual pattern alone cannot isolate the cause or certify bit depth.
- Important limit
- Results reflect events and values exposed by this browser.
- Data handling
- Test values are calculated in this browser. Device Test Bench does not store a test result or create a device fingerprint.
Useful next comparison: Compare the same gradient at the same zoom and scaling in another browser before changing one display setting.
Understanding the result
What a result means
A smooth transition is the expected visual pattern; abrupt bands can originate in the source precision, browser, GPU pipeline, cable mode or panel. One photographed gradient cannot isolate which stage produced the banding.
Confirm the pattern by repeating grayscale gradient. Results reflect events and values exposed by this browser.
How to use this test
- Read the privacy and compatibility notes.
- Start the test and interact only inside the marked test area.
- Repeat the action several times and compare the live indicators.
- Use the troubleshooting section before deciding that hardware is faulty.
What this test checks
- Grayscale gradient
- RGB gradients
- Color banding inspection
- Fullscreen mode
What this test cannot check
Results reflect events and values exposed by this browser.
This test does not certify hardware or replace professional inspection.
Banding can originate in the file, browser, GPU pipeline or panel.
Common problems and troubleshooting
View grayscale and RGB gradients at normal brightness, disable unusual contrast enhancement and compare fullscreen with a screenshot. Repeat in another browser or known image viewer before blaming the display.
- Repeat the same observation. Focus the test surface and repeat “Grayscale gradient” three times under the same conditions.
- Change one condition. Compare “RGB gradients” after changing only the relevant port, connection, browser setting or application.
- Rule out focus or interception. Close overlays and reserved shortcuts, keep the page visible and confirm that the live indicator changes during the action.
- Keep the result within its limit. Results reflect events and values exposed by this browser.
If the same pattern remains across relevant applications and connections, give the manufacturer or a qualified technician the repeatable observations instead of a guessed fault label.
Browser compatibility
Current browsers render CSS gradients, but color depth, dithering and profile handling are platform-dependent. The page cannot force a particular GPU bit depth or HDR output mode.
| Browser | Reference status | Evidence basis | Version | Notes | Checked |
|---|---|---|---|---|---|
| Chrome | Supported | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
| Microsoft Edge | Supported | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
| Firefox | Partial | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
| Safari | Partial | Expected baseline | Not recorded | Feature detection is authoritative; permissions, platform and device support can change availability. | 2026-08-27 |
Privacy information
Test values are calculated in this browser. Device Test Bench does not store a test result or create a device fingerprint.
The public analytics allowlist does not accept pressed keys, typed text, pointer coordinates, media labels, device IDs, recordings, video frames or controller input. Test results are not written to LocalStorage.
Primary technical references
These specifications define the browser signals used by this test. They document web-platform behavior; they do not certify a particular device.
Frequently asked questions
Is this Gradient Test free?
Yes. The test works without an account, download or payment.
Is my test data uploaded?
Test values are calculated in this browser. Device Test Bench does not store a test result or create a device fingerprint.
Does this result prove my hardware is faulty?
No. It shows what the browser can observe. Repeat the test, compare another browser or device, and seek qualified support when the result matters.