Sharing a video with sound in class

When you share a video in class, your learner hears its sound only when your browser shares the tab's audio. This is behind the `CLASSROOM_SCREEN_AUDIO` switch: when it is on, the classroom asks your browser for the shared tab's sound.

Play a video's sound

• Use Chrome or Edge on a computer.
• Press Share screen and choose a Chrome tab, not a window.
• Tick Share tab audio in the picker, then confirm.

While the sound is shared, a small Sharing sound indicator appears at the top of the class. If you shared a tab without ticking the box, a quiet note says Sound isn't being shared.

What does not share sound

• A single window: the browser never shares a window's audio.
• Safari and Firefox: they do not offer tab audio.
• Phones: no screen-share audio.

On Windows and ChromeOS, sharing the whole screen can also carry the computer's sound, where the browser offers it.

Remember

• The shared sound is part of the class recording, kept for 60 days, like the rest of the recording.
• If the class is transcribed, the video's sound is transcribed too.

Updated 2026-11-04