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Home / Device types / USB-C / Thunderbolt Connection
USB-C / Thunderbolt Connection diagnostics

Test what the browser can see. Know when it cannot.

Separate connector/cable/power/display/data problems by testing the function you expect rather than assuming every USB-C port/cable supports the same features.

Run these first

Relevant live checks

Device & Browser Information CheckSee browser-exposed screen, viewport, language, CPU-thread class, memory class, connection hints, and platform information without installing software.
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WebUSB Device TestRequest a compatible USB device through WebUSB and display the browser-exposed manufacturer, product, vendor, and product IDs.
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Screen Share TestVerify that your browser can open the screen/window/tab sharing picker and start a local capture stream.
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First diagnostic sequence

Do the high-signal checks before risky changes

  1. 1

    Define whether you need charging, data, display or Thunderbolt

  2. 2

    Try a known-good cable rated for that function

  3. 3

    Test the attached device directly if possible

What DeviceOK/browser can help check
  • Test some attached USB devices
  • Confirm browser-visible cameras/audio/input devices downstream
What this browser page cannot prove
  • Read cable e-marker capabilities generically
  • Measure USB Power Delivery negotiation
  • Prove Thunderbolt lane/link health