What you're looking for is
playsinline which can be added to any
video element. This works beautifully on inline videos on iOS 10.
The Webflow team might want to add
playsinline to their default background video element, considering users would have to manually inject using JS as a workaround until then.
To demonstrate, open this link from an iOS 10 device to see the video element autoplay:
Here's the Webflow project:
playsinline will not work if your video has an audio track. If you're unable to remove the audio track from a video, you can add
muted to the video element.