Page zooms in when focusing contenteditable on mobile

Phenomenon

On iOS Safari, when a contenteditable region receives focus, the page may automatically zoom in. This can be disorienting and may cause layout issues.

Reproduction example

1. Open a page with a contenteditable region on iOS Safari.
2. Ensure the viewport meta tag has user-scalable=no or a fixed width.
3. Tap on the contenteditable region to focus it.
4. Observe whether the page zooms in.

Observed behavior

• In iOS Safari, focusing a contenteditable may trigger automatic zoom.
• The zoom level may be unexpected or inappropriate.
• The zoom may persist even after the contenteditable loses focus.

Expected behavior

• Focusing a contenteditable should not trigger automatic zoom.
• Or, the zoom behavior should be controllable via CSS or meta tags.
• The viewport should remain stable during focus changes.