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@derRAV3N @jlmosebach @JohnMu @googlechrome I assume you refer to
<meta name="theme-color" content="red">
(developers.google.com/web/updates/2014/11/Support-for-theme-color-in-Chrome-39-for-Android). You can switch it by programmatically changing the tag’scontent
value ("red" above). Media queries can be checked with JavaScript (developer.mozilla.org/en-US/docs/Web/API/Window/matchMedia). Same for Web App Manifest.