diff --git a/content-security-policy/style-src/inline-style-allowed-while-cloning-objects.sub.html b/content-security-policy/style-src/inline-style-allowed-while-cloning-objects.sub.html
index e99699410e00b5..f702e6eb9d65fa 100644
--- a/content-security-policy/style-src/inline-style-allowed-while-cloning-objects.sub.html
+++ b/content-security-policy/style-src/inline-style-allowed-while-cloning-objects.sub.html
@@ -8,119 +8,108 @@
     <script src="/resources/testharness.js"></script>
     <script src="/resources/testharnessreport.js"></script>
     <script>
-        setup({ explicit_done: true });
-
         var t = async_test("Test that violation report event was fired");
         window.addEventListener("securitypolicyviolation", t.step_func_done(function(e) {
             assert_equals(e.violatedDirective, "style-src-attr");
         }));
         window.onload = function() {
-            try {
-                runTests();
-            } finally {
-                done();
-            }
+          window.nodes = document.getElementById('nodes');
+          window.node1 = document.getElementById('node1');
+          window.node1.style.background = "yellow";
+          window.node1.style.color = "red";
+          window.node2 = document.getElementById('node1').cloneNode(true);
+          window.node2.id = "node2";
+          window.node3 = document.getElementById('node3');
+          window.node3.style.background = "blue";
+          window.node3.style.color = "green";
+          window.node4 = document.getElementById('node3').cloneNode(false);
+          window.node4.id = "node4";
+          window.node4.innerHTML = "Node #4";
+          nodes.appendChild(node1);
+          nodes.appendChild(node2);
+          nodes.appendChild(node3);
+          nodes.appendChild(node4);
+          test(function() {
+              assert_equals(node1.style.background.match(/yellow/)[0], "yellow")
+          });
+          test(function() {
+              assert_equals(node2.style.background.match(/yellow/)[0], "yellow")
+          });
+          test(function() {
+              assert_equals(node3.style.background.match(/blue/)[0], "blue")
+          });
+          test(function() {
+              assert_equals(node4.style.background.match(/blue/)[0], "blue")
+          });
+          test(function() {
+              assert_equals(node1.style.color, "red")
+          });
+          test(function() {
+              assert_equals(node2.style.color, "red")
+          });
+          test(function() {
+              assert_equals(node3.style.color, "green")
+          });
+          test(function() {
+              assert_equals(node4.style.color, "green")
+          });
+          test(function() {
+              assert_equals(window.getComputedStyle(node1).background, window.getComputedStyle(node2).background)
+          });
+          test(function() {
+              assert_equals(window.getComputedStyle(node3).background, window.getComputedStyle(node4).background)
+          });
+          test(function() {
+              assert_equals(window.getComputedStyle(node1).color, window.getComputedStyle(node2).color)
+          });
+          test(function() {
+              assert_equals(window.getComputedStyle(node3).color, window.getComputedStyle(node4).color)
+          });
+          window.ops = document.getElementById('ops');
+          ops.style.color = 'red';
+          window.clonedOps = ops.cloneNode(true);
+          window.violetOps = document.getElementById('violetOps');
+          violetOps.style.background = 'rgb(238, 130, 238)';
+          document.getElementsByTagName('body')[0].appendChild(clonedOps);
+          test(function() {
+              assert_equals(ops.style.background, "")
+          });
+          test(function() {
+              assert_equals(ops.style.color, "red")
+          });
+          test(function() {
+              assert_equals(clonedOps.style.background, "")
+          });
+          test(function() {
+              assert_equals(violetOps.style.background.match(/rgb\(238, 130, 238\)/)[0], "rgb(238, 130, 238)")
+          });
+          test(function() {
+              assert_equals(window.getComputedStyle(clonedOps).background, window.getComputedStyle(ops).background)
+          });
+          test(function() {
+              assert_equals(window.getComputedStyle(clonedOps).color, window.getComputedStyle(ops).color)
+          });
+          test(function() {
+              assert_equals(window.getComputedStyle(ops).background, window.getComputedStyle(violetOps).background)
+          });
+          test(function() {
+              assert_equals(window.getComputedStyle(clonedOps).background, window.getComputedStyle(violetOps).background)
+          });
+          test(function() {
+              assert_equals(ops.id, "ops")
+          });
+          test(function() {
+              assert_equals(ops.id, clonedOps.id)
+          });
+          test(function() {
+              let el = document.getElementById("svg");
+              assert_equals(el.getAttribute("style"), "");
+              el.style.background = violetOps.style.background;
+              assert_not_equals(el.style.background, "");
+              let clone = el.cloneNode(true);
+              assert_equals(el.style.background, clone.style.background)
+          }, "non-HTML namespace");
         };
-
-        function runTests() {
-            window.nodes = document.getElementById('nodes');
-            window.node1 = document.getElementById('node1');
-            window.node1.style.background = "yellow";
-            window.node1.style.color = "red";
-            window.node2 = document.getElementById('node1').cloneNode(true);
-            window.node2.id = "node2";
-            window.node3 = document.getElementById('node3');
-            window.node3.style.background = "blue";
-            window.node3.style.color = "green";
-            window.node4 = document.getElementById('node3').cloneNode(false);
-            window.node4.id = "node4";
-            window.node4.innerHTML = "Node #4";
-            nodes.appendChild(node1);
-            nodes.appendChild(node2);
-            nodes.appendChild(node3);
-            nodes.appendChild(node4);
-            test(function() {
-                assert_equals(node1.style.background.match(/yellow/)[0], "yellow")
-            });
-            test(function() {
-                assert_equals(node2.style.background.match(/yellow/)[0], "yellow")
-            });
-            test(function() {
-                assert_equals(node3.style.background.match(/blue/)[0], "blue")
-            });
-            test(function() {
-                assert_equals(node4.style.background.match(/blue/)[0], "blue")
-            });
-            test(function() {
-                assert_equals(node1.style.color, "red")
-            });
-            test(function() {
-                assert_equals(node2.style.color, "red")
-            });
-            test(function() {
-                assert_equals(node3.style.color, "green")
-            });
-            test(function() {
-                assert_equals(node4.style.color, "green")
-            });
-            test(function() {
-                assert_equals(window.getComputedStyle(node1).background, window.getComputedStyle(node2).background)
-            });
-            test(function() {
-                assert_equals(window.getComputedStyle(node3).background, window.getComputedStyle(node4).background)
-            });
-            test(function() {
-                assert_equals(window.getComputedStyle(node1).color, window.getComputedStyle(node2).color)
-            });
-            test(function() {
-                assert_equals(window.getComputedStyle(node3).color, window.getComputedStyle(node4).color)
-            });
-            window.ops = document.getElementById('ops');
-            ops.style.color = 'red';
-            window.clonedOps = ops.cloneNode(true);
-            window.violetOps = document.getElementById('violetOps');
-            violetOps.style.background = 'rgb(238, 130, 238)';
-            document.getElementsByTagName('body')[0].appendChild(clonedOps);
-            test(function() {
-                assert_equals(ops.style.background, "")
-            });
-            test(function() {
-                assert_equals(ops.style.color, "red")
-            });
-            test(function() {
-                assert_equals(clonedOps.style.background, "")
-            });
-            test(function() {
-                assert_equals(violetOps.style.background.match(/rgb\(238, 130, 238\)/)[0], "rgb(238, 130, 238)")
-            });
-            test(function() {
-                assert_equals(window.getComputedStyle(clonedOps).background, window.getComputedStyle(ops).background)
-            });
-            test(function() {
-                assert_equals(window.getComputedStyle(clonedOps).color, window.getComputedStyle(ops).color)
-            });
-            test(function() {
-                assert_equals(window.getComputedStyle(ops).background, window.getComputedStyle(violetOps).background)
-            });
-            test(function() {
-                assert_equals(window.getComputedStyle(clonedOps).background, window.getComputedStyle(violetOps).background)
-            });
-            test(function() {
-                assert_equals(ops.id, "ops")
-            });
-            test(function() {
-                assert_equals(ops.id, clonedOps.id)
-            });
-            test(function() {
-                let el = document.getElementById("svg");
-                assert_equals(el.getAttribute("style"), "");
-                el.style.background = violetOps.style.background;
-                assert_not_equals(el.style.background, "");
-                let clone = el.cloneNode(true);
-                assert_equals(el.style.background, clone.style.background)
-            }, "non-HTML namespace");
-        }
-
     </script>
 </head>
 
diff --git a/css/cssom-view/negativeMargins.html b/css/cssom-view/negativeMargins.html
index 0616e8b4999e73..0deb7ca623e9ba 100644
--- a/css/cssom-view/negativeMargins.html
+++ b/css/cssom-view/negativeMargins.html
@@ -9,7 +9,6 @@
   Hello
 </div>
 <script>
- setup({explicit_done:true});
  window.onload = function () {
    var outer = document.getElementById('outer');
    var inner = document.getElementById('inner');
@@ -26,7 +25,6 @@
                          [inner, outer, document.body, document.querySelector('html')],
                          "elementsFromPoint should get sequence [inner, outer, body, html]");
    });
-   done();
  };
 </script>
 </body>
diff --git a/html/browsers/the-windowproxy-exotic-object/windowproxy-prototype-setting-goes-cross-origin-domain.sub.html b/html/browsers/the-windowproxy-exotic-object/windowproxy-prototype-setting-goes-cross-origin-domain.sub.html
index 239fa6ddf2fc3a..c2a6def6c240b4 100644
--- a/html/browsers/the-windowproxy-exotic-object/windowproxy-prototype-setting-goes-cross-origin-domain.sub.html
+++ b/html/browsers/the-windowproxy-exotic-object/windowproxy-prototype-setting-goes-cross-origin-domain.sub.html
@@ -12,8 +12,6 @@
 
 <script>
 "use strict";
-setup({ explicit_done: true });
-
 window.onload = () => {
   const target = frames[0];
   const origProto = Object.getPrototypeOf(target);
@@ -33,7 +31,5 @@
   testSettingImmutablePrototypeToNewValueOnly(
     "Became cross-origin via document.domain", target, origProto,
     "the original value from before going cross-origin", { isSameOriginDomain: false });
-
-  done();
 };
 </script>
diff --git a/infrastructure/README.md b/infrastructure/README.md
index 7d0ec556aa45e6..9e25c40d83ed7f 100644
--- a/infrastructure/README.md
+++ b/infrastructure/README.md
@@ -2,7 +2,7 @@ This directory contains a number of tests to ensure test running
 infrastructure is operating correctly:
 
  * The tests in assumptions/ are designed to test UA assumptions
-   documented in [assumptions.md](/docs/_writing-tests/assumptions.md).
+   documented in [assumptions.md](/docs/writing-tests/assumptions.md).
 
  * The tests in server/ are designed to test the WPT server configuration
 
diff --git a/infrastructure/expected-fail/window-onload-test.html b/infrastructure/expected-fail/window-onload-test.html
new file mode 100644
index 00000000000000..b0514bce045aa8
--- /dev/null
+++ b/infrastructure/expected-fail/window-onload-test.html
@@ -0,0 +1,28 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<script>
+window.onload = () => {
+  test((t) => {
+    assert_true(true,'This should pass');
+  }, 'test 1');
+  test((t) => {
+    assert_true(false,'This should FAIL');
+  }, 'test 2');
+  test((t) => {
+    assert_true(false,'This should FAIL');
+  }, 'test 3');
+
+  promise_test(async t => {
+    assert_true(false,'This should FAIL');
+  },'promise 1');
+  promise_test(async t => {
+    assert_true(false,'This should FAIL');
+  },'promise 2');
+  promise_test(async t => {
+    assert_true(false,'This should FAIL');
+  },'promise 3');
+};
+</script>
diff --git a/resources/test/tests/unit/late-test.html b/resources/test/tests/unit/late-test.html
index 693d7e3c818ed7..c9f8ec61fe58c3 100644
--- a/resources/test/tests/unit/late-test.html
+++ b/resources/test/tests/unit/late-test.html
@@ -10,11 +10,12 @@
 <p>This test simulates an automated test running scenario, where the test
 results emitted by testharness.js may be interpreted after some delay. It is
 intended to demonstrate that in such cases, any additional tests which are
-executed during that delay are <em>not</em> included in the dataset.</p>
+executed during that delay are included in the dataset.</p>
 
-<p>Although these "late" tests are likely an indication of a mistake in test
-design, they cannot be detected deterministically, so in the interest of
-stability, they should be silently tolerated.</p>
+<p>Although these "late tests" are likely an indication of a mistake in test
+design, they are also recorded. Previously, "late tests" were ignored.
+This test changed to assert "late tests" were no longer ignored after
+https://github.com/web-platform-tests/wpt/pull/38806 was introduced.</p>
 <script>
 async_test(function(t) {
     var source = [
@@ -27,7 +28,7 @@
         "test(function() {}, 'acceptable test');",
         "onload = function() {",
         "  done();",
-        "  test(function() {}, 'this test is late and should be ignored');",
+        "  test(function() {}, 'test registered in onload handler');",
         "};",
         "</" + "script>"
     ].join("\n");
@@ -37,8 +38,9 @@
     window.childReady = t.step_func(function(childWindow) {
         childWindow.add_completion_callback(t.step_func(function(tests, status) {
             t.step_timeout(t.step_func(function() {
-                assert_equals(tests.length, 1);
+                assert_equals(tests.length, 2);
                 assert_equals(tests[0].name, "acceptable test");
+                assert_equals(tests[1].name, "test registered in onload handler");
                 assert_equals(status.status, status.OK);
                 t.done();
             }), 0);
diff --git a/resources/testharness.js b/resources/testharness.js
index 497ae23f0e83ee..bc7fb8961b9f46 100644
--- a/resources/testharness.js
+++ b/resources/testharness.js
@@ -91,7 +91,12 @@
         }
 
         on_event(window, 'load', function() {
+          setTimeout(() => {
             this_obj.all_loaded = true;
+            if (tests.all_done()) {
+              tests.complete();
+            }
+          },0);
         });
 
         on_event(window, 'message', function(event) {