Trailing spaces should be removed as per CSS Text, but Blink does not remove them for the following case:
  <div>1111 <br></div>

Edge, Gecko, and LayoutNG remove them, while Blink and WebKit do not.
 

Deleted: inline-block-width-br-and-spaces.html 955 bytes

inline-block-width-br-and-spaces.html 955 bytes View Download