| <!DOCTYPE html> |
| <link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1/#at-property-rule"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="./resources/utils.js"></script> |
| <style> |
| @property --x { |
| syntax: "<length>"; |
| inherits: false; |
| initial-value: 0px; |
| } |
| #outside { |
| --x: calc(1px + 1px); |
| --y: calc(1px + 1px); |
| } |
| </style> |
| <template id=template> |
| <style> |
| /* This rule should have no effect */ |
| @property --y { |
| syntax: "<length>"; |
| inherits: false; |
| initial-value: 0px; |
| } |
| #inside { |
| --x: calc(1px + 1px); |
| --y: calc(1px + 1px); |
| } |
| </style> |
| <div id=inside></div> |
| </template> |
| <div id=host></div> |
| <div id=outside></div> |
| <script> |
| |
| test(() => { |
| let root = host.attachShadow({ mode: 'open' }); |
| root.append(template.content.cloneNode(true)); |
| let inside = root.querySelector('#inside'); |
| assert_equals(getComputedStyle(outside).getPropertyValue('--x'), '2px'); |
| assert_equals(getComputedStyle(outside).getPropertyValue('--y'), ' calc(1px + 1px)'); |
| assert_equals(getComputedStyle(inside).getPropertyValue('--x'), '2px'); |
| assert_equals(getComputedStyle(inside).getPropertyValue('--y'), ' calc(1px + 1px)'); |
| }, '@property rules in shadow trees should have no effect'); |
| |
| </script> |
