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| -rw-r--r-- | testing/web-platform/tests/largest-contentful-paint/idlharness.html | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/testing/web-platform/tests/largest-contentful-paint/idlharness.html b/testing/web-platform/tests/largest-contentful-paint/idlharness.html new file mode 100644 index 0000000000..84d1c7ff9a --- /dev/null +++ b/testing/web-platform/tests/largest-contentful-paint/idlharness.html @@ -0,0 +1,30 @@ +<!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> |