There are couple of things that author still don't get.
display:inline means that element does not establish a box. Such element is rather a collection of individual content boxes (e.g. glyphs). These boxes can be placed on different lines (text wrapping) and so on. As no element box as no margins and paddings applied to such elements.
img element (and input and other replaced(^) elements for that matter) is not a display:inline but rather display:inline-block. Even you will define them as display:inline they will be treated as display:inline-block and so e.g. margins will apply to them.
(^) representation of replaced elements (img,input,textarea,iframe,etc.) is outside the scope of CSS - they are always treated as solid boxes.
display:inline means that element does not establish a box. Such element is rather a collection of individual content boxes (e.g. glyphs). These boxes can be placed on different lines (text wrapping) and so on. As no element box as no margins and paddings applied to such elements.
img element (and input and other replaced(^) elements for that matter) is not a display:inline but rather display:inline-block. Even you will define them as display:inline they will be treated as display:inline-block and so e.g. margins will apply to them.
(^) representation of replaced elements (img,input,textarea,iframe,etc.) is outside the scope of CSS - they are always treated as solid boxes.