the block element is fluid (normally)
button is not a block element, so it does not have
display:block just to make the element appear as a block element. To put it bluntly, it is to wrap the line
display:block is not equal to block element , so it cannot be full.
personal opinion
this is determined by the specification
for block-level replacement elements
The used value of 'width' is determined as for inline replaced elements. Then the rules for non-replaced block-level elements are applied to determine the margins.The
width is still calculated as an inline element, but the margin is calculated as a block-level element. The default auto is generally its intrinsic value, and the width of the button element may be the width of its inner font, plus the default inner margin and the width of the border
while ordinary block-level elements have fluid properties because when their width is auto
'margin-left' +' border-left-width' + 'padding-left' +' width' + 'padding-right' +' border-right-width' + 'margin-right' = width of containing block
Next: No values are printed out during the implementation of the sequence table. Where is the problem?
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