| <!DOCTYPE html> |
| <html lang="en"> |
| <meta charset="UTF-8"> |
| |
| <title>CSS Conditional Test: Custom Properties in @supports</title> |
| <meta name="assert" |
| content="Test passes if custom properties are supported and correctly detected in @supports, |
| or unsupported and correctly detected in @supports."> |
| <link rel="help" href="https://www.w3.org/TR/css3-conditional/#at-supports"> |
| <link rel="help" href="https://www.w3.org/TR/css-variables-1/"> |
| <link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact"> |
| <link rel="match" href="at-supports-001-ref.html"> |
| |
| <style> |
| div { |
| background: green; |
| height: 20px; |
| width: 100px; |
| } |
| |
| body { |
| --badcolor: red; |
| --goodcolor: green; |
| } |
| div { |
| background: var(--badcolor); |
| } |
| @supports (--foo: whatever) { |
| .test1 { background: green; } |
| } |
| |
| @supports (--foo: whatever !important) { |
| .test2 { background: var(--goodcolor); } |
| } |
| |
| .test3 { background: green; } |
| @supports (--foo: whatever !bogus) { |
| .test3 { background: red; } |
| } |
| |
| @supports (color: var(--anything) invalid-value) { |
| .test4 { background: green; } |
| } |
| |
| .test5 { background: red; } |
| @supports not (--goodcolor: green) { |
| .test5 { background: green; } |
| } |
| .test5 { background: var(--goodcolor) } |
| </style> |
| |
| <p>Test passes if there is a <strong>filled green square</strong> and <strong>no red</strong>.</p> |
| |
| <div class="test1"></div> |
| <div class="test2"></div> |
| <div class="test3"></div> |
| <div class="test4"></div> |
| <div class="test5"></div> |
