Web Bluetooth: Make BluetoothRemoteGATTServer an EventTarget

Category: Miscellaneous
Type: New or changed feature
Status: Proposed (Chrome Proposed)
Intent stage: None

Breaking change: No
Enterprise impact: None
Spec maturity: Working draft

WPT details: Chromium's global interface listing tests verify that BluetoothRemoteGATTServer inherits from EventTarget: https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/web_tests/webexposed/global-interface-listing.html The Web Bluetooth WPT IDL harness will cover the same inheritance after specification PR 672 merges and the generated Web Bluetooth IDL snapshot is updated: https://github.com/web-platform-tests/wpt/blob/master/bluetooth/bidi/idl/idlharness.tentative.https.window.js https://github.com/WebBluetoothCG/web-bluetooth/pull/672

Summary

BluetoothRemoteGATTServer inherits from EventTarget, exposing the standard addEventListener(), removeEventListener(), and dispatchEvent() methods. This enables connection-level events to be dispatched directly on the GATT server.

Motivation

BluetoothRemoteGATTServer represents an active GATT connection and needs to host connection-level events. Making it an EventTarget gives web applications the standard event-listener API needed by events such as the separately proposed maxwritewithoutresponsesizechanged event.

Standards & signals

Specification: https://pr-preview.s3.amazonaws.com/hjanuschka/web-bluetooth/pull/672.html#bluetoothremotegattserver
Firefox: Negative — Firefox does not implement Web Bluetooth. The citation is Mozilla's position on the overall Web Bluetooth API, not a separate position on this inheritance change.
Safari: Oppose — Safari does not implement Web Bluetooth. The citation is WebKit's position on the overall Web Bluetooth API, not a separate position on this inheritance change.
Web developers: Positive — this is a small preparation feature for the larger demanded: https://issues.chromium.org/issues/40265040
Tracking bug: https://issues.chromium.org/issues/40265040

Ecosystem

Web Platform Tests: https://wpt.fyi/results/?q=bluetooth%2Fbidi%2Fidl%2Fidlharness
Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+Web%20Bluetooth%3A%20Make%20BluetoothRemoteGATTServer%20an%20EventTarget
MDN Web Docs: https://developer.mozilla.org/en-US/search?q=Web%20Bluetooth%3A%20Make%20BluetoothRemoteGATTServer%20an%20EventTarget
Baseline status: https://webstatus.dev/?q=Web%20Bluetooth%3A%20Make%20BluetoothRemoteGATTServer%20an%20EventTarget

Explainers: https://github.com/WebBluetoothCG/web-bluetooth/pull/672

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