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Apple Developer Docs

WebKit JS / UserMessageHandler

Contents

Declaration
Topics

UserMessageHandler

Declaration

interface UserMessageHandler

Topics

Instance Methods

postMessage

Open on developer.apple.com

WebKit JSClass

safari desktop 10.0+safari mobile 9.0+

Declaration
Topics

Built on 2026-06-12 · Snapshot snapshot-20260612-beta.1 (macOS 27.0) · Commit fba13e1 · by @g-cqd · based on Apple Developer Documentation