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+<!DOCTYPE html>
+<html>
+<head>
+<link rel="stylesheet" href="resources/dialog.css">
+</head>
+<body>
+<p>
+This tests that a modal dialog's containing block is in the initial containing block and that it is unaffected by
+ancestor elements with overflow or opacity.
+<div class="pseudodialog" style="position: absolute; top: 100px; height: 250px; width: 90%; background-color: yellow">
+ This dialog should be onscreen with a width of 90% of the page. It is the child of an narrow element
+ positioned off screen, but the containing block of a top layer element is the initial containing block, so its
+ position and percent lengths are relative to that.
+</div>
+<div class="pseudodialog" style="position: absolute; top: 200px; left: 0px; height: 100px; background-color: cyan">
+ This dialog should be unaffected by its ancestor with overflow. It should not be clipped.
+</div>
+<div class="pseudodialog" style="position: absolute; top: 250px; left: 0px; background-color: magenta">
+ This dialog should be unaffected by its ancestor with opacity.
+</div>
+</body>
+</html>