| <!DOCTYPE html> |
| <meta charset="utf-8"> |
| <title>CSS Test: transform: perspective(0)</title> |
| <link rel="author" title="Xidorn Quan" href="https://www.upsuper.org"> |
| <link rel="author" title="Mozilla" href="https://www.mozilla.org"> |
| <link rel="help" href="https://drafts.csswg.org/css-transforms-2/#funcdef-perspective"> |
| <meta name="assert" content="perspective(0) should behave like identity transform function."> |
| <link rel="match" href="reference/green.html"> |
| <style> |
| #cover-me, #test { |
| width: 100px; |
| height: 100px; |
| } |
| #cover-me { |
| background: red; |
| position: relative; |
| margin-bottom: -100px; |
| } |
| #test { |
| background: green; |
| /* This should be an identity transform, since perspective(0) must be |
| * treated as perspective(infinity), and consequently translateZ() |
| * doesn't have any effect, so that it covers up #cover-me. |
| * If perspective(0) is invalid, #test would not create a stacking |
| * context, and #cover-me would be placed on top of #test showing red. |
| * If perspective(0) is handled as perspective(epsilon), #test would |
| * be invisible. */ |
| transform: perspective(0) translateZ(50px); |
| } |
| </style> |
| <p>Pass if there is NO red below:</p> |
| <div id="cover-me"></div><div id="test"></div> |
