Volume Slider Doesn't Work on Video Content in Mobile Safari

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You may find that the volume slider doesn't work on slides with video content when you view the HTML5 output in mobile Safari on an iPad/iPhone.

Apple has chosen to ignore volume settings for video content since iOS devices have built-in volume controls. (See Apple's developer documentation for details.) As a result, you'll need to use the volume controls on your iPad or iPhone to adjust the volume of video content in your course.