

Very important detail from the article:
The man fled on foot after being approached by the officers, drew his weapon and opened fire, Quinn said.
That’s the reason why the Secret Service shot him. Although it’s still unclear what made him “suspicious” for officers to approach him.



That’s one of the things that actually makes sense for a (locally rendered) site to have. Not the screen itself per se, but the usable canvas. This allows things like a static navigation bar on the left, and the remainder of the screen for text.
I see no reason for a site to have my battery status, ever. Gyroscope has limited need, and should ask permission.