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diff --git a/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/emptyish-script-elements.html b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/emptyish-script-elements.html
new file mode 100644
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+++ b/testing/web-platform/tests/html/semantics/scripting-1/the-script-element/emptyish-script-elements.html
@@ -0,0 +1,75 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Treatment of various empty-ish script elements</title>
+<link rel="author" title="Domenic Denicola" href="mailto:d@domenic.me">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#prepare-a-script">
+<link rel="help" href="https://html.spec.whatwg.org/multipage/#already-started">
+<link rel="help" href="https://github.com/whatwg/html/issues/3419">
+
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<script id="no-children"></script>
+<script id="whitespace-child"> </script>
+
+<script id="gets-a-no-text-child"></script>
+<script id="gets-an-empty-text-child"></script>
+<script id="gets-a-text-child"></script>
+<script id="gets-a-comment-child"></script>
+<script id="gets-a-text-descendant"></script>
+
+<script>
+"use strict";
+
+test(() => {
+  const el = document.querySelector("#no-children");
+  el.appendChild(document.createTextNode("window.noChildrenExecuted = true;"));
+  assert_true(window.noChildrenExecuted);
+}, "A script with no children bails early, before setting already-started, so can be executed when adding text");
+
+test(() => {
+  const el = document.querySelector("#whitespace-child");
+  el.appendChild(document.createTextNode("window.whitespaceChildExecuted = true;"));
+  assert_equals(window.whitespaceChildExecuted, undefined);
+}, "A script with a whitespace child executes, setting already-started, so adding text is a no-op");
+
+test(() => {
+  const el = document.querySelector("#gets-a-no-text-child");
+  el.appendChild(document.createElement("span"));
+  el.appendChild(document.createTextNode("window.getsANoTextChildExecuted = true;"));
+  assert_true(window.getsANoTextChildExecuted);
+}, "A script with an empty element inserted bails early, before setting already-started, so can be executed when adding text");
+
+test(() => {
+  const el = document.querySelector("#gets-an-empty-text-child");
+  el.appendChild(document.createTextNode(""));
+  el.appendChild(document.createTextNode("window.getsAnEmptyTextChildExecuted = true;"));
+  assert_true(window.getsAnEmptyTextChildExecuted);
+}, "A script with an empty text node inserted bails early, before setting already-started, so can be executed when adding text");
+
+test(() => {
+  const el = document.querySelector("#gets-a-text-child");
+  el.appendChild(document.createTextNode("window.getsATextChildExecuted1 = true;"));
+  el.appendChild(document.createTextNode("window.getsATextChildExecuted2 = true;"));
+  assert_true(window.getsATextChildExecuted1);
+  assert_equals(window.getsATextChildExecuted2, undefined);
+}, "A script with a text child inserted executes, setting already-started, so adding text is a no-op");
+
+test(() => {
+  const el = document.querySelector("#gets-a-comment-child");
+  el.appendChild(document.createComment("window.getsACommentChild1 = true;"));
+  el.appendChild(document.createTextNode("window.getsACommentChild2 = true;"));
+  assert_equals(window.getsACommentChild1, undefined);
+  assert_true(window.getsACommentChild2);
+}, "A script with a comment child inserted bails early, before setting already-started, so can be executed when adding text");
+
+test(() => {
+  const el = document.querySelector("#gets-a-text-descendant");
+  const child = document.createElement("span");
+  child.appendChild(document.createTextNode("window.getsATextDescendantExecuted1 = true;"));
+  el.appendChild(child);
+  el.appendChild(document.createTextNode("window.getsATextDescendantExecuted2 = true;"));
+  assert_equals(window.getsATextDescendantExecuted1, undefined);
+  assert_true(window.getsATextDescendantExecuted2);
+}, "A script with an element containing text inserted bails early, before setting already-started, so can be executed when adding text");
+</script>