Search Widget – Dark Mode Cookie Test

Cookie Controls

Cookie key: userModeTheme

Current cookie value: —

The widget polls the userModeTheme cookie every 500 ms and sends a postMessage to the iframe. Removing the cookie falls back to prefers-color-scheme.

Test scenarios

Cookie = dark → widget should switch to dark mode within ~500 ms.
Cookie = light → widget should switch to light mode within ~500 ms.
Cookie removed → widget falls back to your OS prefers-color-scheme setting and reacts live if it changes.
No data-dark-mode-cookie-key attribute → only prefers-color-scheme is used (no polling).
data-enable-darkmode="false" → dark mode disabled entirely regardless of cookie.