From the article: > Amid its grandeur, NBC also maintains touches of subtlety—such as the tiny possession indicator above each team’s score In later CBS scree

From the article: > Amid its grandeur, NBC also maintains touches of subtlety—such as the tiny possession indicator above each team’s score In later CBS screenshots, you can see it indicated sometimes. When it shows "3rd & 7", that box will be filled with the team color of the team in possession. It's not a permanent box, though.