Mouse Input & Pointer Inspector
A real-time diagnostic utility inspecting live PointerEvent telemetry and demonstrating the security boundaries between browser DOM events and hardware firmware.
Live PointerEvent Stream
2. What Can a Website Actually See From a Mouse?
Web browsers receive high-level event messages dispatching through the operating system's window manager. The browser is informed where the pointer moved in viewport pixels, but is deliberately restricted from querying low-level hardware registers.
3. Browser DOM Events vs Hardware Firmware
| Property Category | Browser Accessible? (Web Standards) | How It Is Retrieved |
|---|---|---|
| Client Coordinates (X, Y) | Yes (100% Accessible) | PointerEvent clientX / clientY within viewport |
| Movement Deltas (dx, dy) | Yes (100% Accessible) | PointerEvent movementX / movementY increments |
| Button Click Mask | Yes (100% Accessible) | PointerEvent buttons bitmask (1, 2, 4, 8, 16) |
| Device Pixel Ratio | Yes (100% Accessible) | window.devicePixelRatio (OS display scaling) |
| Raw Hardware DPI | No (Inaccessible in Sandbox) | Not exposed by any browser security standard |
| USB Polling Rate (Hz) | No (Estimated only) | Hardware report frequency hidden by OS event loop |
| Onboard Mouse Memory | No (Inaccessible in Sandbox) | Requires WebHID / WebUSB with explicit user grant |
Mouse Input Test FAQ
Common questions about browser mouse input APIs and security.
Why can websites see my cursor position but not my DPI?
Can WebHID read mouse DPI?
高精度マウスツール一覧
競技ゲームの感度移行や振り向き距離の精密キャリブレーションに特化した各種ツール。
Related Mouse DPI Guides
Continue exploring technical documentation, hardware steps, and calibration methods.
Mouse DPI Guide: Complete Overview
The master educational hub covering DPI meaning, checking methods, adjustments, and hardware settings.
What Is DPI on a Mouse?
A complete breakdown of sensor counts, physical resolution, and how DPI impacts pointer displacement.
How to Check Mouse DPI
Four reliable methods to determine your active DPI using hardware buttons, software, and distance tests.