Utilize `theme-color` meta tag in UI design
It's becoming more common for browsers to use the page's
theme-color meta tag in their UI; Safari across macOS and iOS recently added this, while Chrome on Android and Vivaldi on desktop have done this for years.
|Chrome (Android)||Safari (iOS)||Safari (macOS)||Vivaldi (desktop)|
It may be worth considering if we want GNOME Web to utilize the page's
theme-color in any way, e.g. in the design of the tab bar or headerbar. It appears
theme-color support was also recently merged into WebKit itself, which should make it simpler to use from the app side than manually parsing anything.