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<!DOCTYPE html> <html> <body> <video id="myVideo1" width="320" height="240" controls> <source src="movie.mp4" type="video/mp4"> <source src="movie.ogg" type="video/ogg"> Your browser does not support the video tag. </video> <video id="myVideo2" width="320" height="240" controls> <source src="movie.mp4" type="video/mp4"> <source src="movie.ogg" type="video/ogg"> Your browser does not support the video tag. </video><br> <button onclick="setMedGroup()" type="button">Set media group for videos</button> <button onclick="getMedGroup()" type="button">Get media group for videos</button> <script> var x = document.getElementById("myVideo1"); var y = document.getElementById("myVideo2"); function setMedGroup() { x.mediaGroup = "test"; y.mediaGroup = "test"; } function getMedGroup() { alert("Video 1 media group: " + x.mediaGroup + ". Video 2 media group: " + y.mediaGroup); } </script> </body> </html>