4. Width and Height

The width and height attributes specify the size of the player’s width="" and height="" in pixels.

Single-Source

Element Breakdown
<video src="#" poster="#" width="" height="" preload controls></video>

Multiple-Source

Element Breakdown
<video poster="#" width="" height="" preload controls>
   <source src="#" type="">
   <source src="#" type="">
</video>

html attribute size video