| <!DOCTYPE html> |
| <head> |
| <title>Performance Paint Timing Test: FP followed by FCP</title> |
| </head> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <div id="main"></div> |
| <div id="image"></div> |
| |
| <script> |
| async_test(function (t) { |
| const bufferedEntries = performance.getEntriesByType('paint'); |
| assert_equals(bufferedEntries.length, 0, "No paint entries yet"); |
| const div = document.createElement("div"); |
| div.style.width = "100px"; |
| div.style.height = "100px"; |
| div.style.backgroundColor = "red"; |
| div.style.color = "blue"; |
| document.getElementById("main").appendChild(div); |
| function testPaintEntries() { |
| const bufferedEntries = performance.getEntriesByType('paint'); |
| if (bufferedEntries.length < 1) { |
| t.step_timeout(function() { |
| testPaintEntries(); |
| }, 20); |
| return; |
| } |
| t.step(function() { |
| assert_equals(bufferedEntries.length, 1, "FP only."); |
| assert_equals(bufferedEntries[0].entryType, "paint"); |
| assert_equals(bufferedEntries[0].name, "first-paint"); |
| }); |
| const img = document.createElement("IMG"); |
| img.src = "resources/circles.png"; |
| img.onload = function() { |
| function secondTestPaintEntries() { |
| const moreBufferedEntries = performance.getEntriesByType('paint'); |
| if (moreBufferedEntries.length < 2) { |
| t.step_timeout(function() { |
| secondTestPaintEntries(); |
| }, 20); |
| return; |
| } |
| t.step(function() { |
| assert_equals(moreBufferedEntries.length, 2, "FP and FCP."); |
| assert_equals(moreBufferedEntries[0].entryType, "paint"); |
| assert_equals(moreBufferedEntries[0].name, "first-paint"); |
| const fpEntriesGotByName = |
| performance.getEntriesByName('first-paint'); |
| assert_equals(fpEntriesGotByName.length, 1); |
| assert_equals(moreBufferedEntries[0], fpEntriesGotByName[0]); |
| assert_equals(moreBufferedEntries[1].entryType, "paint"); |
| assert_equals(moreBufferedEntries[1].name, "first-contentful-paint"); |
| const fcpEntriesGotByName = |
| performance.getEntriesByName('first-contentful-paint'); |
| assert_equals(fcpEntriesGotByName.length, 1); |
| assert_equals(moreBufferedEntries[1], fcpEntriesGotByName[0]); |
| t.done(); |
| }); |
| } |
| t.step(function() { |
| secondTestPaintEntries(); |
| }); |
| }; |
| document.getElementById('image').appendChild(img); |
| } |
| t.step(function() { |
| testPaintEntries(); |
| }); |
| }, "First Paint triggered by non-contentful paint. Image load triggers First Contentful Paint."); |
| </script> |
| </body> |
| </html> |
