> providing they can maintain a decent level of contrast Safari wouldn't apply the theme-color if it makes the UI inaccessible (it has a very few narrow range

> providing they can maintain a decent level of contrast Safari wouldn't apply the theme-color if it makes the UI inaccessible (it has a very few narrow range of color that it won't apply). Also, if the tag is not specified, Safari would not blend the website content into the tab bar.