javascript - 關于使用overflow: hidden來清除浮動的疑問
問題描述
正常情況下,給浮動的父元素設置overflow:hidden;就可以清楚浮動,但是我發現被浮動元素的父元素是body時,給body設置overflow:hidden,是無法清除浮動的,有人說是body不屬于普通流,所以無效,有誰能解釋下嗎?
感謝:CRIMX借用王大陸的一句話:
你這種人不是大神,就是走在成為大神的路上。
問題解答
回答1:這是因為并沒有產生新的 BFC
產生新 BFC 的一個條件:
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).
為什么對 <body> 設置 overflow 會擴散到 viewport:
UAs must apply the ’overflow’ property set on the root element to the viewport. When the root element is an HTML 'HTML' element or an XHTML 'html' element, and that element has an HTML 'BODY' element or an XHTML 'body' element as a child, user agents must instead apply the ’overflow’ property from the first such child element to the viewport, if the value on the root element is ’visible’. The ’visible’ value when used for the viewport must be interpreted as ’auto’. The element from which the value is propagated must have a used value for ’overflow’ of ’visible’.
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