I just found an interesting jQuery bug. I was creating a <video> tag via jQuery, including the src attribute, and appending it to my container, like this:
$("#videoWrapper").append($("<video id='myVideo' src='video1.mp4' />"));
This worked and the video played fine, but when I was debugging in Fiddler I found it was actually downloading the video twice! It must be activating the tag somehow during the append process. That’s not so good for performance.
The fix was to add the src attribute afterwards:
$("#videoWrapper").append($("<video id='myVideo' />")); $("#myVideo").attr('src', 'video1.mp4');
There are probably some other ways to address it as well, but this worked!