| Index: LayoutTests/fast/dom/HTMLDialogElement/non-modal-dialog-containing-block-expected.html | 
| diff --git a/LayoutTests/fast/dom/HTMLDialogElement/non-modal-dialog-containing-block-expected.html b/LayoutTests/fast/dom/HTMLDialogElement/non-modal-dialog-containing-block-expected.html | 
| new file mode 100644 | 
| index 0000000000000000000000000000000000000000..f326cf8e2f27d904d622a0e4b05f8d208cec528d | 
| --- /dev/null | 
| +++ b/LayoutTests/fast/dom/HTMLDialogElement/non-modal-dialog-containing-block-expected.html | 
| @@ -0,0 +1,34 @@ | 
| +<!DOCTYPE html> | 
| +<html> | 
| +<head> | 
| +<script> | 
| +</script> | 
| +<style> | 
| +.pseudodialog { | 
| +    position: absolute; | 
| +    left: 0; right: 0; | 
| +    margin: auto; | 
| +    border: solid; | 
| +    padding: 1em; | 
| +    background: white; | 
| +    color: black; | 
| +} | 
| +</style> | 
| +</head> | 
| +<body> | 
| +<p> | 
| +This tests that a 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 dialog 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> | 
|  |