WKWebView does not respect the hardware mute button

Number:rdar://28716885 Date Originated:10/11/2016
Status:Open Resolved:
Product:iOS Product Version:10
Classification:WebKit Reproducible:Always
When a WKWebView is used to play an HTML5 <video> element, the sound is always on regardless of the hardware mute switch's state. UIWebView does respect the hardware mute switch.

Steps to Reproduce:
1. Set hardware mute switch to mute
2. Use a WKWebView to load an HTML5 <video> player
3. Play the video

Expected Results:
Video should play muted

Actual Results:
Video plays with audio on


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