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[css2.1] specification #192

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teazean opened this issue Dec 7, 2017 · 1 comment

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teazean commented Dec 7, 2017

最终重新回顾一下css的specification，准备阅读一下里面的一些基本章节，做一些知识点的纪要。

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teazean commented Dec 7, 2017 •

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Section 8：Box Model

margin

margin percent value: The percentage is calculated with respect to the width of the generated box's containing block. Note that this is true for 'margin-top' and 'margin-bottom' as well. If the containing block's width depends on this element, then the resulting layout is undefined in CSS 2.1.
margin collapse:
- Horizontal margins never collapse.
- 其他的情况：规范写的太深奥了，还是看 mdn文档

padding

padding percent value: The percentage is calculated with respect to the width of the generated box's containing block, even for 'padding-top' and 'padding-bottom'. If the containing block's width depends on this element, then the resulting layout is undefined in CSS 2.1.

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