| <!DOCTYPE html> |
| <body> |
| <script> |
| var imgLoad = function() { |
| window.parent.postMessage("shrink", "*"); |
| } |
| |
| var test = function () { |
| var entries = performance.getEntriesByType("resource"); |
| var downloadedImages = 0; |
| for (var i = 0; i < entries.length; ++i) { |
| var entry = entries[i]; |
| if (entry.name.indexOf("base-image") != -1) |
| ++downloadedImages; |
| } |
| return downloadedImages; |
| } |
| |
| window.addEventListener("message", function(msg) { |
| if (msg.data == "test") |
| window.parent.postMessage("test_" + test(), "*"); |
| }); |
| </script> |
| <picture> |
| <source srcset="base-image1.png" media="(max-width: 200px)"> |
| <img id=image src="base-image2.png" onload="imgLoad()"> |
| <picture> |
| </body> |
