CSS mix-blend-mode may affect contenteditable text rendering

Phenomenon

When a contenteditable element has CSS mix-blend-mode applied, text rendering may be affected. Text may appear with incorrect colors, selection may not be visible, and caret may not render correctly.

Reproduction example

1. Create a contenteditable div with mix-blend-mode: multiply over a colored background.
2. Type text and observe color rendering.
3. Select text and observe selection visibility.
4. Observe caret rendering.
5. Compare with a contenteditable without mix-blend-mode.

Observed behavior

• In Firefox on Windows, mix-blend-mode may affect text rendering.
• Text colors may be incorrect.
• Selection may not be visible.
• Caret may not render correctly.

Expected behavior

• mix-blend-mode should not affect text readability.
• Selection should be visible.
• Caret should render correctly.