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At http://dev.w3.org/csswg/css-box/#initial-containing-block. change the text "This containing block is called the initial containing block." to read "This containing block is called the initial containing block (ICB)." "ICB" is used as an abbreviation for "initial containing block" by CSS implementors and spec authors -- but the abbreviation "ICB" does not actually appear anywhere in any CSS specs, so its meaning it only obvious to those already in the know (and it causes CSS specs to now show up in search-engine results for, e.g., "ICB CSS".