Video Confusion

Question

Why mp4 file is in the first position?
If i make. ogg file in the first then what is the problem?

i mean can i write randomly that first. ogg source then. webm source then. mp4 file like that?
<source src="http://www.sololearn.com/uploads/video.mp4" type="video/mp4">

<source src="http://www.sololearn.com/uploads/video.ogg" type="video/ogg">

Like that=
<source src="http://www.sololearn.com/uploads/video.ogg" type="video/ogg">

<source src="http://www.sololearn.com/uploads/video.mp4" type="video/mp4">

<source src="http://www.sololearn.com/uploads/video.webm" type="video/webm">

Answer 1

the order doesn't matter here .

Answer 2

If you are giving the viewer a choice between the file types, Then web browser will play the first format that is supported. The order does not matter.