How to Test an HDR Monitor in Your Browser
Validate browser HDR media queries, Display-P3 color space, and specular highlight tone-mapping.
1. Browser Environment Signals
Modern web standards allow web applications to inspect display dynamic range using CSS media queries:
• `@media (dynamic-range: high)` checks whether the display and browser pipeline support high dynamic range content.
• `@media (color-gamut: p3)` checks whether the display supports the saturated Display-P3 wide color gamut.
• Canvas 2D color space: Browsers supporting Canvas color management can render directly into `display-p3` color space.
Browser signals report what the operating system compositor advertises to the web engine. It does not measure physical nits or hardware VESA DisplayHDR certification.
2. Testing Highlight Clipping & Tone Mapping
A major issue on budget HDR monitors is aggressive tone-map clipping. When asked to display bright specular highlights, the monitor simply crushes everything above 300 or 400 nits into solid blown-out white.
Open the ScreenCheck HDR Highlight Clipping Test and examine digital levels 240 through 255. High-quality HDR displays will preserve distinct boundaries between steps 250, 252, and 254.
Recommended Interactive Tests
Run these dedicated fullscreen tools to test your display against this guide's criteria:
Frequently Asked Questions
Why does Windows look washed out when HDR is enabled?
Windows HDR mode expects SDR desktop content to be mapped to a specific SDR content brightness slider (found under Display Settings → HDR). If this slider is set too high or low, colors appear washed out or overly dark.
Related Diagnostic Guides
Continue learning with complementary display inspection guides:
What is Mini-LED Blooming & How Local Dimming Works
Learn why bright objects against dark backgrounds cause halos on Mini-LED displays, how zone counts impact blooming, and how to test for local dimming artifacts.
Color Banding Test: Diagnosing Bit-Depth & Dithering
Learn why color banding occurs on gradients, how to distinguish test quantization steps from monitor panel banding, and how to verify 8-bit+FRC and 10-bit processing.