IBadge

Set/clear the count on the installed app icon.

• Wraps: Badging API
• MDN: Badging API
• Home: Rask.Core.Browser (all hosts)
• Shape: one-shot
• Availability: Web/Server ✅ · PWA/WASM ✅

setAppBadge needs an installed PWA instance, and the exact rendering is platform-dependent — treat the badge as a hint, not a guaranteed surface.

See also

• Source: IBadge.cs
• Capability matrix
• Browser APIs — the narrative map