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/* Source: http://test.csswg.org/suites/css2.1/20110323/html4/floats-wrap-bfc-outside-001.htm */ #wrap {width:600px; border:1px solid;} .a {background:lime; color:#fff; width:80%;} .b {float:right; width:18%; background: cyan; color: #000; height:10em;} textarea {width: 100%; height:10em;}