| <!doctype html> |
| <title>Largest Contentful Paint IDL tests</title> |
| <link rel="help" href="https://wicg.github.io/largest-contentful-paint/"> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/resources/WebIDLParser.js"></script> |
| <script src="/resources/idlharness.js"></script> |
| <script> |
| 'use strict'; |
| |
| idl_test( |
| ['largest-contentful-paint'], |
| ['performance-timeline', 'dom', 'hr-time'], |
| async (idl_array, t) => { |
| idl_array.add_objects({ |
| LargestContentfulPaint: ['lcp'] |
| }); |
| |
| window.lcp = await new Promise((resolve, reject) => { |
| const observer = new PerformanceObserver(entryList => { |
| resolve(entryList.getEntries()[0]); |
| }); |
| observer.observe({type: 'largest-contentful-paint', buffered: true}); |
| t.step_timeout(() => reject('Timed out waiting for LargestContentfulPaint entry'), 3000); |
| }); |
| } |
| ); |
| </script> |
| <!-- a contentful element to observe --> |
| <img src=/images/green-100x50.png> |
