Safari seems to have problem with the mediagroup attribute

[matlin72]

Some time ago I had som problems with safari. After some struggle I gave up and starting from scratch. I got my problems back when adding the mediagroup attribute in the

var videosInMediagroup = $('video[data-mediagroup="' + videoId1OrMediagroup + '"]');

Now it works in Safari as well. One soloution would be not using mediagroup at all but in my opinion , mediagroup makes the code more clear.