Solution 1 :

The problem was i dont mark the size attribute on source tag,so browsers have no any information about image width

Problem :

I am trying to improve my page using picture html5 element.

When i am use default img tag it will sizing by intrinsic size default.
But when i am use picture size it will sizing over intrinsic size.

How can i fix that?

over intrinsic size picture tag

default equal intrinsic size