No they don't. display:inline-block, display:table-cell and display:list-item all establish containing blocks, so any of those would also be consistent with that sentence from the spec. What you are looking for is section 9.7 Relationships between 'display', 'position', and 'float', step 2
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I have not thought about this before. So I checked it with a CodePen and found this sentence in the Specification:
I assume that these words about "new containing block" force browser developers to display absolutely positioned pseudo-element as a
block.No they don't.
display:inline-block,display:table-cellanddisplay:list-itemall establish containing blocks, so any of those would also be consistent with that sentence from the spec. What you are looking for is section 9.7 Relationships between 'display', 'position', and 'float', step 2