If all three of 'left', 'width', and 'right' are 'auto': First set any 'auto' values for 'margin-left' and 'margin-right' to 0. ![]() 'left' + 'margin-left' + 'border-left-width' + 'padding-left' + 'width' + 'padding-right' + 'border-right-width' + 'margin-right' + 'right' = width of containing block The constraint that determines the used values for these elements is: Here is the Specification detailing how you can find the width/height of any element: įrom there you can read for absolute element that: The root element therefore is out of flow, as the container for everything in our document, and establishes the Block Formatting Context for the document. Out of flow items create a new Block Formatting Context (BFC) and therefore everything inside them can be seen as a mini layout, separate from the rest of the page.
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