ALL TESTS/DISPLAY INFORMATION & CAPABILITIES

BROWSER REPORTED DIAGNOSTIC QUERY

Display Information & Capabilities

Legitimate display parameters, graphics APIs, and browser window metrics queried directly from your browser environment.

Browser-Reported Information — Not Hardware TelemetryWeb browsers operate within a secure operating system sandbox. All values shown below reflect what the browser and OS compositor expose to web APIs. This test does not pretend to access direct hardware sensor telemetry (such as physical monitor EEPROM, factory EDID ROM, internal panel voltage, or subpixel stripe arrangements).

TECHNICAL CAPABILITY BOUNDARIES

What Browsers Can & Cannot Detect

To prevent false diagnosis, Screen Tester strictly separates browser APIs from physical hardware specifications.

TIER 1Browser-Detected

Live Browser Telemetry

APIs directly queryable by JavaScript in this browsing context.

✓Viewport dimensions (CSS pixels)
✓Device Pixel Ratio (DPR scaling)
✓Color bit depth (e.g. 24-bit / 30-bit)
✓Screen orientation & angle
✓WebGL GPU renderer & limits

View Browser Capabilities →

TIER 2User-Provided

Hardware Specifications

Specifications provided by the user from monitor documentation.

•Manufacturer & model name
•Native physical resolution
•Rated refresh rate (Hz)
•Rated brightness & contrast
•Panel technology & HDR tier

Edit Inspection Profile →

TIER 3Not Determinable

Hardware Limitations

Metrics that cannot be determined or verified through web APIs.

✕Exact physical panel diagonal
✕True OS/GPU hardware refresh rate
✕Measured luminance in nits (cd/m²)
✕Laboratory color accuracy (ΔE)
✕Panel degradation & internal health

Troubleshooting Guide →

1. Screen & Viewport Geometry

Live Browser Context

Logical ResolutionProbing...CSS Layout Pixels

Estimated Physical ResProbing...≈ 0.00 Megapixels (W×H×DPR)

Current ViewportProbing...window.innerWidth × innerHeight

Device Pixel Ratio (DPR)1.00xStandard 100% 1:1 Scaling

Available Screen Area0 × 0Excluding OS Taskbars / Menubars

Color & Pixel Depth0-bit / 0-bit24-bit True Color (8-bit per channel)

Screen OrientationUnknown0° Angle

Observed Frame TimingMeasuring...requestAnimationFrame hardware sync

2. Browser Capability & API Matrix

Standardized API Feature Probing

Feature / Standard	Status	Description
Fullscreen API	Checking...	Full display immersion without browser chrome
HTML5 Canvas 2D	Checking...	Hardware-accelerated 2D rasterization context
WebGL 1.0	Checking...	OpenGL ES 2.0 graphics pipeline in browser
WebGL 2.0	Checking...	OpenGL ES 3.0 advanced shaders & floating textures
WebGPU API	Checking...	Next-gen low-overhead GPU compute & rendering API
Screen Orientation API	Checking...	Orientation lock & change event tracking
Window Management (Multi-Screen)	Checking...	Cross-screen topology & multi-display placement
High Dynamic Range (HDR)	Checking...	dynamic-range: high media query matches OS pipeline
Wide Color Gamut (P3)	Checking...	Display P3 color space supported by display chain
Rec. 2020 Wide Gamut	Checking...	Ultra-wide Rec. 2020 gamut signaling
Touch Input Points	Checking...	Capacitive touch / stylus digitizer input detected

3. WebGL Diagnostics & Controlled Render Test

GPU Pipeline Verification

CONTROLLED 3D POLYHEDRON RENDER

-- FPS

Controlled 3D transform • Zero overhead

Graphics Pipeline Query Parameters

WebGL VersionProbing...

Reported GPU VendorProbing...

Reported GPU RendererProbing...

Max 2D Texture SizeUnavailable

Max Renderbuffer SizeUnavailable

Hardware Antialiasing (MSAA)Probing...

Measurement Boundary: WebGL diagnostics report the driver abstraction layer (e.g. ANGLE Direct3D/Metal/Vulkan wrapper) presented by the browser. It does not reflect physical silicon temperatures, fan speeds, or memory clock frequencies.

4. Multi-Monitor Display Detection

Window Management API

Cross-Display Topology & Screen Placement

Query the browser for multi-monitor setups using the W3C Window Management API.

Screen Is Extended:Unspecified / Single Screen

Click "Query Display Topology" above. If your browser supports the Window Management API and you grant permission, individual physical display resolutions and secondary screen properties will be enumerated here. If unsupported or denied, the browser operates strictly within its standard single-screen sandbox.

RELATED UTILITIES

Resolution & PPI Calculator→•Display Comparison Calculator (PPI, Distance, Aspect Ratio)→•Custom Test Pattern Generator→•Troubleshooting Guide→•Browser Compatibility→

Feature / Standard

Status

Fullscreen API

Checking...

HTML5 Canvas 2D

Checking...

WebGL 1.0

Checking...

WebGL 2.0

Checking...

WebGPU API

Checking...

Screen Orientation API

Checking...

Window Management (Multi-Screen)

Checking...

High Dynamic Range (HDR)

Checking...

Wide Color Gamut (P3)

Checking...

Rec. 2020 Wide Gamut

Checking...

Touch Input Points

Checking...