| <!DOCTYPE html> |
| <head> |
| <title>Performance Paint Timing Test: FCP should fire for background image only when visible</title> |
| <style> |
| #main { |
| width: 100px; |
| height: 100px; |
| } |
| |
| /* contentful and preFCP classes are defined in test_fcp script. */ |
| #main.preFCP { |
| visibility: hidden; |
| } |
| |
| #main.contentful, #main.preFCP { |
| background-image: url(../resources/circles.png); |
| } |
| |
| #main.contentful { |
| visibility: visible; |
| } |
| </style> |
| </head> |
| <body> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="../resources/utils.js"></script> |
| <div id="main"></div> |
| <script> |
| // Load the image into memory first to make sure it's decoded. |
| function load_image() { |
| const img = document.createElement("img"); |
| img.src = "../resources/circles.png"; |
| |
| return new Promise(resolve => { |
| img.onload = async () => resolve(); |
| }); |
| } |
| |
| test_fcp("First contentful paint fires for background image only when visible.", load_image); |
| </script> |
| </body> |
| |
| </html> |