CSS will-change may improve or degrade contenteditable performance
OS: macOS 14.0 · Device: Desktop or Laptop MacBook Pro · Browser: Chrome 120.0 · Keyboard: US
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When a contenteditable element has CSS will-change property set, performance may be affected. In some cases, it may improve performance by hinting the browser about upcoming changes. In other cases, it may degrade performance by creating unnecessary layers.
When a contenteditable element has CSS will-change property set, performance may be affected. In some cases, it may improve performance by hinting the browser about upcoming changes. In other cases, it may degrade performance by creating unnecessary layers.
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| Case | OS | Device | Browser | Keyboard | Status |
|---|---|---|---|---|---|
| ce-0095-contenteditable-with-css-will-change | macOS 14.0 | Desktop or Laptop MacBook Pro | Chrome 120.0 | US | draft |
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OS: macOS 14.0 · Device: Desktop or Laptop MacBook Pro · Browser: Chrome 120.0 · Keyboard: US
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When a contenteditable element has CSS filters applied (blur, brightness, etc.), editing performance may be degraded. Typing may lag, and selection may be slow to update.
When a contenteditable element is used with virtual scrolling libraries (e.g., for large documents), the virtual scrolling mechanism may interfere with text selection and caret positioning. The selection may be lost when elements are removed from the DOM during scrolling.
When a MutationObserver is attached to a contenteditable element or its parent, the observer callbacks may interfere with editing performance. Frequent DOM mutations during typing can trigger many observer callbacks, causing lag or jank.
When a ResizeObserver is attached to a contenteditable element, the observer may trigger during editing as content changes size. This can cause layout recalculations and visual jumps, especially when the contenteditable has dynamic height.
Managing exponential slowdowns in large documents and browser-specific engine thrashing.
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