<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <html style="position:relative; height:50%;"><head><title>CSS Test: Test for containing block for absolutely positioned elements being initial containing block</title> <link rel="author" title="Robert O'Callahan" href="mailto:robert@ocallahan.org"> <link rel="author" title="Mozilla Corporation" href="http://mozilla.com/"> <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#containing-block-details"> <link rel="match" href="reference/abspos-containing-block-initial-009-ref.htm"> <meta name="assert" content="If there is no such ancestor, the containing block is the initial containing block."> <meta name="flags" content=""> </head><body style="position:absolute; width:50%; top:50px; left:50px; height:100%; margin:0; border:10px solid black;"> </body></html>