1 files changed, 39 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/execution-timing/039.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/execution-timing/039.html
new file mode 100644
index 0000000000..3720e24866
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/execution-timing/039.html
@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html><head>
+        <title> scheduler: IFRAMEs added with DOM</title>
+        <script src="/resources/testharness.js"></script>
+        <script src="/resources/testharnessreport.js"></script>
+        <script src="testlib/testlib.js"></script>
+</head>
+<body>
+        <div id="log">FAILED (This TC requires JavaScript enabled)</div>
+        <div></div>
+        <script>log('inline script #1');
+                for( var i=0; i<2; i++ ){
+                        var iframe=document.createElement('iframe');
+                        document.getElementsByTagName('div')[1].appendChild(iframe);
+                        iframe.src='pages/helloworld.html?'+i+'&'+Math.random();
+                }
+                log('end script #1');
+        </script>
+
+        <script type="text/javascript">
+        log( 'inline script #2' );
+        promise_test(() => {
+          const frames = document.querySelectorAll("iframe");
+          return Promise.all([
+            new Promise(resolve => window.addEventListener('load', resolve)),
+            new Promise(resolve => frames[0].addEventListener('load', resolve)),
+            new Promise(resolve => frames[1].addEventListener('load', resolve)),
+          ]).then(() => {
+            assert_equals(eventOrder.length, 5);
+            assert_array_equals(
+                eventOrder.slice(0, 3),
+                ['inline script #1', 'end script #1', 'inline script #2'],
+                "inline scripts should run first");
+            assert_in_array('frame/popup script 0', eventOrder.slice(3, 5), 'iframe should have loaded');
+            assert_in_array('frame/popup script 1', eventOrder.slice(3, 5), 'iframe should have loaded');
+          });
+        }, 'iframes should load asynchronously after inline script run');
+        </script>
+</body></html>