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|  | 1 <!DOCTYPE html> | 
|  | 2 <html> | 
|  | 3 <head> | 
|  | 4 <script> | 
|  | 5 if (window.internals) | 
|  | 6     internals.settings.setDialogElementEnabled(true); | 
|  | 7 </script> | 
|  | 8 </head> | 
|  | 9 <body> | 
|  | 10 <p> | 
|  | 11 This tests that a dialog's containing block is in the initial containing block a
    nd that it is unaffected by | 
|  | 12 ancestor elements with overflow or opacity. | 
|  | 13 <div style="position: absolute; top: 400px; opacity: 0.3"> | 
|  | 14     <dialog id="opaqueDialog" style="position: absolute; top: 250px; left: 0px; 
    background-color: magenta"> | 
|  | 15         This dialog should be unaffected by its ancestor with opacity. | 
|  | 16     </dialog> | 
|  | 17 </div> | 
|  | 18 <div style="position: absolute; overflow: hidden; width: 500px; height: 150px; t
    op: 400px; left: 300px"> | 
|  | 19     <dialog id="unclippedDialog" style="position: absolute; top: 200px; left: 0p
    x; height: 100px; background-color: cyan"> | 
|  | 20         This dialog should be unaffected by its ancestor with overflow. It shoul
    d not be clipped. | 
|  | 21     </dialog> | 
|  | 22 </div> | 
|  | 23 <div style="position: absolute; top: 1000px; left: 1000px; width: 20px;"> | 
|  | 24     <dialog id="bottomDialog" style="position: absolute; top: 100px; height: 250
    px; width: 90%; background-color: yellow"> | 
|  | 25         This dialog should be onscreen with a width of 90% of the page. It is th
    e child of an narrow element | 
|  | 26         positioned off screen, but the containing block of a dialog is the initi
    al containing block, so its | 
|  | 27         position and percent lengths are relative to that. | 
|  | 28     </dialog> | 
|  | 29 </div> | 
|  | 30 <script> | 
|  | 31 document.getElementById('bottomDialog').show(); | 
|  | 32 document.getElementById('unclippedDialog').show(); | 
|  | 33 document.getElementById('opaqueDialog').show(); | 
|  | 34 </script> | 
|  | 35 </body> | 
|  | 36 </html> | 
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