height:100px;
padding:100px;
background-color:black;}
< H1 > box2 {< / H1 >height:100px;
margin: 0 -100px;
background-color:black;}
what is the principle that neither of the above box sets the width, but can be stretched to the width of the entire browser?
Block element does not set width, which defaults to 100% of parent element width
Block element width occupies full parent element width by default in standard document stream
Block element default width
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