| <!DOCTYPE html> |
| <title>@position-try for ::before and ::after pseudo elements</title> |
| <link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#fallback"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <style> |
| #container { |
| background: maroon; |
| position: relative; |
| width: 195px; |
| height: 200px; |
| left: 999999px; /* force fallback */ |
| } |
| #target::before { |
| position-try-fallbacks: --f1, --f2; |
| background: lime; |
| position: absolute; |
| left: 200px; |
| top: 200px; |
| width: 100px; |
| height: 200px; |
| content: ""; |
| } |
| #target::after { |
| position-try-fallbacks: --f1, --f2; |
| background: green; |
| position: absolute; |
| left: 100px; |
| width: 100px; |
| height: 100px; |
| content: ""; |
| } |
| @position-try --f1 { |
| top: 100px; |
| left: 50px; |
| } |
| @position-try --f2 { |
| top: 0px; |
| left: 0px; |
| } |
| </style> |
| <div id="container"> |
| <div id="target"></div> |
| </div> |
| <script> |
| test(() => { |
| const before_style = getComputedStyle(target, "::before"); |
| assert_equals(before_style.top, "0px"); |
| assert_equals(before_style.left, "0px"); |
| }, "::before using second fallback"); |
| test(() => { |
| const after_style = getComputedStyle(target, "::after"); |
| assert_equals(after_style.top, "100px"); |
| assert_equals(after_style.left, "50px"); |
| }, "::after using first fallback"); |
| </script> |
