beforeinput event is not supported in Safari
OS: macOS Ubuntu 22.04 · Device: Desktop or Laptop Any · Browser: Safari 120.0 · Keyboard: US
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The beforeinput event, which is crucial for intercepting and modifying input before it's committed to the DOM, is not supported in Safari. This makes it difficult to implement custom input handling that works across all browsers.
The beforeinput event, which is crucial for intercepting and modifying input before it’s committed to the DOM, is not supported in Safari. This makes it difficult to implement custom input handling that works across all browsers.
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| Case | OS | Device | Browser | Keyboard | Status |
|---|---|---|---|---|---|
| ce-0043-beforeinput-not-supported | macOS Ubuntu 22.04 | Desktop or Laptop Any | Safari 120.0 | US | draft |
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OS: macOS Ubuntu 22.04 · Device: Desktop or Laptop Any · Browser: Safari 120.0 · Keyboard: US
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In Safari desktop, when preventDefault() is called on keydown or beforeinput events for insertParagraph (Enter key), the IME composition state becomes corrupted. Subsequent text input fails to trigger proper input events, causing characters to not be inserted or composition to malfunction.
On iOS, when using voice dictation to input text into contenteditable elements, the system may fire duplicate beforeinput and input events after the initial dictation completes. The text is split into words and events are re-fired, causing synchronization issues. Composition events do not fire during dictation, making it difficult to distinguish dictation from keyboard input.
On iOS Safari, input and beforeinput can fire with inputType 'insertText' multiple times (e.g. voice dictation) or with inputType undefined/null. Forcing re-render or changing selection during this flow desyncs the editor model from the DOM and can permanently break subsequent input.
During IME composition or in certain browser/IME combinations, the beforeinput event may have a different inputType than the corresponding input event. For example, beforeinput may fire with insertCompositionText while input fires with deleteContentBackward. This mismatch can cause handlers to misinterpret the actual DOM change and requires storing beforeinput's targetRanges for use in input event handling.
The selection (window.getSelection()) in beforeinput events can differ from the selection in corresponding input events. This mismatch can occur during IME composition, text prediction, or when typing adjacent to formatted elements like links. The selection in beforeinput may include adjacent formatted text, while input selection reflects the final cursor position.
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