this calculated height determines the content-area (content area) of the HTML element, and I"ll talk about content-area later. You can think of content-area as the area where background acts .
for inline elements, padding and border increase the background area, but not content-area (not the height of the line-box). Generally speaking, you can"t see content-area on the screen. Margin-top and margin-bottom had no effect on both.
for replaceable inline elements (replaced inline elements), inline-block and blockified, padding, margin and border increase height . Note that margin), therefore affects the height of content-area and line-box
the first paragraph above says that content-area is the area where background acts, but for inline elements, it adds that background is not a content area. Is that a contradiction between the two?