html块状元素高度,css：如何计算块元素的高度？ -尊龙游戏旗舰厅官网

block-level non-replaced elements in normal flow when ‘overflow’ computes to ‘visible’

this section also applies to block-level non-replaced elements in normal flow when ‘overflow’ does not compute to ‘visible’ but has been propagated to the viewport.

[. . .]

if ‘height’ is ‘auto’,the height depends on whether the element has any block-level children and whether it has padding or borders:

if it only has inline-level children,the height is the distance between the top of the topmost line box and the bottom of the bottommost line box.

if it has block-level children,the height is the distance between the top border-edge of the topmost block-level child box that does not have margins collapsed through it and the bottom border-edge of the bottommost block-level child box that does not have margins collapsed through it.

[. . . ]

only children in the normal flow are taken into account (i.e.,floating boxes and absolutely positioned boxes are ignored,and relatively positioned boxes are considered without their offset).

[. . . ]

block-level,non-replaced elements in normal flow when ‘overflow’ does not compute to ‘visible’ (except if the ‘overflow’ property’s value has been propagated to the viewport).

if ‘height’ is ‘auto’,07001.

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