| <!DOCTYPE html> |
| <style> |
| dialog { |
| top: 100px; |
| height: 100px; |
| width: 100px; |
| background: green; |
| } |
| |
| /* The default CSS style from the spec gives a background color but no dimensions, |
| * so the backdrop has zero size by default. |
| * http://www.whatwg.org/specs/web-apps/current-work/multipage/rendering.html#rendering |
| */ |
| dialog::backdrop { |
| position: fixed; |
| top: 0; |
| left: 0; |
| right: 0; |
| bottom: 0; |
| } |
| </style> |
| <body> |
| Test for the default user agent style of dialog::backdrop. The test passes if |
| there is a green box, above a very lightly translucent gray box spanning the |
| viewport. |
| <dialog></dialog> |
| <script> |
| document.querySelector('dialog').showModal(); |
| </script> |
| </body> |