Bug 1900232 Comment 0 Edit History
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https://drafts.csswg.org/css-anchor-position-1/#anchor-size-fn ('top', 'left', 'bottom', 'right', 'inset-block-start', 'inset-block-end', 'inset-inline-start', 'inset-inline-end', 'inset-block', 'inset-inline', and 'inset')