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TestTube
Welcome to TestTube, our ideas incubator. This is where YouTube engineers and developers test out recipes and concoctions that aren't quite fully baked and invite you to tell us how they're coming along.
Your comments will help us improve and perfect the mixtures we're working on. So jump in, play around, and send your feedback directly to the brains behind the scenes.
MoodWall

Find your vibe! Explore videos by thoughts and reactions.
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HTML5 Video

Try an experimental version of the YouTube HTML5 video player.
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YouTube Music Discovery

Make playlists and discover new artists and music videos.
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Feather
View YouTube videos on a super-low latency page.
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Video Questions Editor
Add questions to your video and find out more about your audience.
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Topic Explorer
Explore and subscribe to topics recommended for you and more.
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