Block Formatting Context

本文探讨了块级格式化上下文的概念及其在视觉格式化模型中的作用,重点介绍了触发块级格式化上下文的条件,这对于CSS作者来说至关重要。

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A block formatting context is a box that satisfies at least one of the following:

  • the value of “float” is not “none”,
  • the used value of “overflow” is not “visible”,
  • the value of “display” is “table-cell”, “table-caption”, or “inline-block”,
  • the value of “position” is neither “static” nor “relative”.

When it comes to the visual formatting model (this is how user agents process the document tree for visual media), block formatting contexts are big players. So it is crucial for CSS authors to have a solid understanding of their relationship with the flow, floats, clear, and margins.

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