Spellcheck interferes with contenteditable editing

Phenomenon

When spellcheck="true" is enabled on a contenteditable region in Safari, the spellcheck functionality may interfere with normal editing. Red underlines may appear incorrectly, and the spellcheck UI may block text selection or editing.

Reproduction example

1. Create a contenteditable div with spellcheck="true".
2. Type some text, including intentionally misspelled words.
3. Observe the spellcheck behavior.
4. Try to select text that has spellcheck underlines.

Observed behavior

• In Safari on macOS, spellcheck underlines may interfere with text selection.
• The spellcheck UI may appear in unexpected locations.
• Editing may be blocked or delayed by spellcheck processing.

Expected behavior

• Spellcheck should not interfere with normal editing operations.
• Text selection should work regardless of spellcheck underlines.
• The spellcheck UI should not block or delay editing.