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HTML5 Videos (created using the <video> tag), automatically go into fullscreen when playback begins. Fullscreen playback also provides controls to seek, play/pause the video. This is by design.
To prevent the video from going into full-screen, add webkit-playsinline to the video tag. This is especially useful if you provide custom controls for HTML5 video.
<video width="620" height="352" webkit-playsinline>
<source src="./movie.mp4" type="video/mp4"/>