| <!DOCTYPE html> |
| <head> |
| <title>PerformanceObserver.supportedEntryTypes contains "layout-shift"</title> |
| </head> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script> |
| test(() => { |
| assert_implements(window.LayoutShift, 'Layout Instability is not supported.'); |
| assert_implements(typeof PerformanceObserver.supportedEntryTypes !== "undefined", |
| 'supportedEntryTypes is not supported.'); |
| assert_greater_than(PerformanceObserver.supportedEntryTypes.indexOf("layout-shift"), -1, |
| "There should be an entry 'layout-shift' in PerformanceObserver.supportedEntryTypes"); |
| }, "supportedEntryTypes contains 'layoutShift'."); |
| </script> |
| </body> |
| </html> |