• New feature proposal: add support for media attribute to <meta name="theme-color"> whatwg/html#6495

• https://css-tricks.com/safari-15-new-ui-theme-colors-and-a-css-tricks-cameo/

  The addition is that it supports media queries.

• Safari/WebKit:

  • Shipping in Safari 15: https://developer.apple.com/documentation/safari-release-notes/safari-15-beta-release-notes#HTML
  • https://bugs.webkit.org/show_bug.cgi?id=224389
  • https://developer.apple.com/videos/play/wwdc2021/10029/

• Chrome: https://bugs.chromium.org/p/chromium/issues/detail?id=1200528

• Firefox: https://bugzilla.mozilla.org/show_bug.cgi?id=1706179

Related to but not the same since that's for Web App Manifest: w3c/manifest#975

I can imagine that this could get merged into https://caniuse.com/meta-theme-color depending on how it goes. In any case it's related.