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The other CSS terms for this are block and inline, as in padding-inline-start and padding-block-end. Whether it’s the top/bottom/left/right edge is determined by flow direction. iOS/SwiftUI calls the inline directions leading and trailing, but I’m not sure how it works with vertical type

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Technically, block and inline dimensions are defined with respect to the direction of the text. The terms used in the CSS spec to refer to the direction of justify-content and align-items are the main axis and the cross axis, respectively.

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