HDR Validation Gate
Non-Blocking Check
HDR Environment & Capability Check
Before testing HDR gradients, highlight clipping, and wide color gamuts, verify whether your current browser tab and operating system report an active high dynamic range signal.
Browser-Observed Display Signals
Honest Environmental Telemetry
HDR Signal:Unconfirmed
Color Space:sRGB Standard
DPR / Scale:1x
ResolutionMeasuring...
Color DepthMeasuring...
HDR QueryStandard (SDR)
Canvas P3sRGB Only
Signals represent what your browser engine and OS display pipeline report. Browser APIs cannot directly probe physical panel luminance (nits) or physical colorimeter coverage.
Ready to Test?
Even if your browser signal is currently unconfirmed or reports standard dynamic range (SDR), ScreenCheck allows you to continue into HDR tests using SDR reference fallback patterns.
What influences browser HDR behavior?
1. OS HDR SwitchOn Windows, verify that "Use HDR" is toggled ON in System → Display. On macOS, ensure "High Dynamic Range" is enabled for external monitors.
2. GPU & Cable BandwidthEnsure your HDMI 2.0/2.1 or DisplayPort 1.4/2.1 cable has sufficient bandwidth for 10-bit HDR output without chroma subsampling dropping to 4:2:0.
3. Browser Hardware AccelerationIf browser hardware acceleration is disabled, compositing pipelines fall back to 8-bit software sRGB buffers.