Mariota was 7 for 14 for 95 yards when he left. Washington led 10-7 at the time, but Philadelphia then put together 17-play, 83-yard TD drive to go ahead 14-10.
This was Mariota's eighth start of the season in place of Daniels for the Commanders, who are sitting last season's AP NFL Offensive Rookie of the Year the rest of the way.
Johnson had made brief appearances earlier this season but hadn't thrown a pass.
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