| Index: LayoutTests/fast/dom/HTMLDialogElement/non-modal-dialog-containing-block.html | 
| diff --git a/LayoutTests/fast/dom/HTMLDialogElement/non-modal-dialog-containing-block.html b/LayoutTests/fast/dom/HTMLDialogElement/non-modal-dialog-containing-block.html | 
| new file mode 100644 | 
| index 0000000000000000000000000000000000000000..d675fad7d49836193e3ee3e702c2dc9222865718 | 
| --- /dev/null | 
| +++ b/LayoutTests/fast/dom/HTMLDialogElement/non-modal-dialog-containing-block.html | 
| @@ -0,0 +1,36 @@ | 
| +<!DOCTYPE html> | 
| +<html> | 
| +<head> | 
| +<script> | 
| +if (window.internals) | 
| +    internals.settings.setDialogElementEnabled(true); | 
| +</script> | 
| +</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 style="position: absolute; top: 400px; opacity: 0.3"> | 
| +    <dialog id="opaqueDialog" style="position: absolute; top: 250px; left: 0px; background-color: magenta"> | 
| +        This dialog should be unaffected by its ancestor with opacity. | 
| +    </dialog> | 
| +</div> | 
| +<div style="position: absolute; overflow: hidden; width: 500px; height: 150px; top: 400px; left: 300px"> | 
| +    <dialog id="unclippedDialog" 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. | 
| +    </dialog> | 
| +</div> | 
| +<div style="position: absolute; top: 1000px; left: 1000px; width: 20px;"> | 
| +    <dialog id="bottomDialog" 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. | 
| +    </dialog> | 
| +</div> | 
| +<script> | 
| +document.getElementById('bottomDialog').show(); | 
| +document.getElementById('unclippedDialog').show(); | 
| +document.getElementById('opaqueDialog').show(); | 
| +</script> | 
| +</body> | 
| +</html> | 
|  |