| <!DOCTYPE html> |
| <head> |
| <title>Performance Paint Timing Test: FCP when canvas context is created</title> |
| </head> |
| <body> |
| <script src="../resources/utils.js"></script> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <canvas id="canvas" width="50" height="50"></canvas> |
| <script> |
| promise_test(async t => { |
| assert_precondition(window.PerformancePaintTiming, "Paint Timing isn't supported."); |
| await new Promise(r => window.addEventListener('load', r)); |
| await assertNoFirstContentfulPaint(t); |
| const canvas = document.getElementById('canvas'); |
| const context = canvas.getContext('2d'); |
| context.fillRect(0, 0, 100, 100); |
| await assertFirstContentfulPaint(t); |
| }, 'Canvas should count as contentful when context is created'); |
| </script> |
| </body> |
| |
| </html> |