What is the calculation method of margin for different elements of CSS
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Inline, non-permutation element: if the margin value is auto, the calculated values of margin-left and margin-right are also
Inline, replacement element: ditto
Inline-block, replacement elements in the document stream: ditto
Inline-block, non-permutation elements in the document stream: ditto
'margin-left' +' border-left-width' + 'padding-left' +' width' + 'padding-right' +' border-right-width' + 'margin-right' = width of containing block
In the following case, if the margin value is auto
If width is autovalue, then the other value is auto
If the values of margin-left and margin-right are auto and the values used are equal, they are centered horizontally relative to the containing block.
Block-level replacement elements, in document stream
Same as block-level non-permutation elements.
Summary
For both inline-level permutation elements and non-permutation elements, both margin-left and margin-auto are calculated when the margin value is auto.
Block-level replacement elements and non-substitution elements:
'margin-left' +' border-left-width' + 'padding-left' +' width' + 'padding-right' +' border-right-width' + 'margin-right' = width of containing block
If width is autovalue, then the other value is auto
If the values of margin-left and margin-right are auto and the values used are equal, they are centered horizontally relative to the containing block.
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