Box model

Note: Several sections of this specification have been updated by other specifications. Please, see "Cascading Style Sheets (CSS) — The Official Definition" in the latest CSS Snapshot for a list of specifications and the sections they replace. The CSS Working Group is also developing CSS level 2 revision 2 (CSS 2.2). The CSS box model describes the rectangular boxes that are generated for elements

[rikuba]

"Percentages: refer to width of containing block" padding/marginの%指定はtop/bottomであろうとwidthから算出

[sutara_lumpur]

#CSS paddingのパーセント指定は、包含する要素の横幅が基準。なるほど。 “Percentages: refer to width of containing block”