AI BriefingKakaoBank Resolves Mobile WebView iOS and Android Virtual Keyboard Screen Shift Issue with VirtualViewport
·2026.10.14 19:51
Key point
KakaoBank resolved mobile WebView keyboard UI issues by using a VirtualViewport component that synchronizes the visual viewport height.
Details
- Resolved iOS screen shifting and Android input field obscuring issues caused by the operational differences between the layout viewport and the visual viewport
- Polled visualViewport.height using requestAnimationFrame to detect keyboard open/close events and dynamically adjust container height
- On iOS, blocked automatic scrolling by using a CSS animation that changes the render object's opacity from 0 to 1 upon focus
- Starting with Android Chrome 108, the default behavior was changed to maintain the layout viewport and only shrink the visual viewport when the keyboard is displayed
- The VirtualKeyboard API is not supported in Safari and iOS WebView, making it impossible to predict keyboard height in advance
- Since position: fixed elements behave differently across browsers, reliance was reduced by adopting a Flexbox-based layout
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