html5 - CSS3 margins and 100% width/height declarations -


i'm surprised: there tons of posts asking 100% height situations, ones include *margins in child element don't yield workable responses.

surely common, no? i'm struggling margins causing child element overflow. see fiddle below.

my css so:

html, body {height:100%} // doing 1 100% height issues div {     box-sizing:border-box; // box model consistent, need webkit } #outer {     border:1px solid #f00;     position:absolute; // requirement     top:40px;     left:12px;     width:300px; } #inner {     position:relative; // i'm hoping avoid absolute     border:1px solid #0f0;     margin:10px 20px;     height:100%;     width:100%; }

fiddle: http://jsfiddle.net/3apzq/

the prized question is: how child element (green border) inline of parent, correct margins?

you can't use width 100% in case, because width calculated before apply margin. inner div have 300px width, , 20px margin.

it's better use margin parameters:

#inner {     position:relative;     border:1px solid #0f0;     margin:10px 20px 10px 20px; }

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