On your landing page, display a banner that changes based on the detected browser:
The API requires (or localhost for development) and must be triggered by a user gesture (e.g., button click). web serial api browser support
Never assume support. Always implement a runtime check and provide graceful degradation. On your landing page, display a banner that
// Additional check for Android OTG capability if (/Android/i.test(navigator.userAgent)) return supported: true, note: "Requires OTG cable and USB host mode enabled." ; On your landing page