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diff --git a/testing/web-platform/tests/html/dom/elements/the-innertext-and-outertext-properties/outertext-setter.html b/testing/web-platform/tests/html/dom/elements/the-innertext-and-outertext-properties/outertext-setter.html
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+++ b/testing/web-platform/tests/html/dom/elements/the-innertext-and-outertext-properties/outertext-setter.html
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+<!DOCTYPE html>
+<title>outerText setter test</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+
+<ul>
+  <li>A <span id="testReplacePrevious">B</span></li>
+  <li><span id="testReplaceFollowing">A</span> B</li>
+  <li>A <span id="testReplaceBoth">B</span> C</li>
+  <li><span id="testRemove">Testing</span> removing node using outerText.</li>
+  <li><span id="testNewlines">Replace this child with lots of newlines</span></li>
+</ul>
+
+<div id="container"></div>
+
+<script>
+"use strict";
+
+test(() => {
+  const node = document.getElementById("testReplacePrevious");
+  const parent = node.parentNode;
+
+  node.outerText = "Replaced";
+
+  assert_equals(parent.innerHTML, "A Replaced");
+  assert_equals(parent.childNodes.length, 1, "It got merged with the previous text node");
+}, "Replacing a node and merging with the previous text node");
+
+test(() => {
+  const node = document.getElementById("testReplaceFollowing");
+  const parent = node.parentNode;
+
+  node.outerText = "Replaced";
+
+  assert_equals(parent.innerHTML, "Replaced B");
+  assert_equals(parent.childNodes.length, 1, "It got merged with the following text node");
+}, "Replacing a node and merging with the following text node");
+
+test(() => {
+  const node = document.getElementById("testReplaceBoth");
+  const parent = node.parentNode;
+
+  node.outerText = "Replaced";
+
+  assert_equals(parent.innerHTML, "A Replaced C");
+  assert_equals(parent.childNodes.length, 1, "It got merged with the previous and following text node");
+}, "Replacing a node and merging with the previous and following text node");
+
+test(t => {
+  const container = document.getElementById("container");
+  t.add_cleanup(() => { container.textContent = ""; });
+
+  container.append("A", "B", document.createElement("span"), "D", "E");
+  assert_equals(container.childNodes.length, 5, "Precondition check: five separate nodes");
+
+  const node = container.childNodes[2];
+  node.outerText = "Replaced";
+
+  assert_equals(container.innerHTML, "ABReplacedDE");
+  assert_equals(container.childNodes.length, 3, "It got merged with the previous and following text node");
+  assert_equals(container.childNodes[0].data, "A");
+  assert_equals(container.childNodes[1].data, "BReplacedD");
+  assert_equals(container.childNodes[2].data, "E");
+}, "Only merges with the previous and following text nodes, does not completely normalize");
+
+test(t => {
+  const container = document.getElementById("container");
+  t.add_cleanup(() => { container.textContent = ""; });
+
+  container.append(document.createElement("span"));
+  const node = container.childNodes[0];
+  node.outerText = "";
+
+  assert_equals(container.childNodes.length, 1, "Creates text node for the empty string");
+  assert_equals(container.childNodes[0].data, "");
+}, "Empty string");
+
+test(t => {
+  const container = document.getElementById("container");
+  t.add_cleanup(() => { container.textContent = ""; });
+
+  container.append("1", "2", document.createElement("span"), "3", "4");
+  const node = container.childNodes[2];
+  node.outerText = "";
+
+  assert_equals(container.childNodes.length, 3, "It got merged with the previous and following text node");
+  assert_equals(container.childNodes[0].data, "1");
+  assert_equals(container.childNodes[1].data, "23");
+  assert_equals(container.childNodes[2].data, "4");
+}, "Empty string with surrounding text nodes");
+
+test(t => {
+  const node = document.getElementById("testNewlines");
+  const parent = node.parentNode;
+
+  node.outerText = "\n\r\n\r";
+
+  assert_equals(parent.innerHTML, "<br><br><br>");
+  assert_equals(parent.childNodes.length, 3);
+  assert_equals(parent.childNodes[0].localName, "br", "node 1");
+  assert_equals(parent.childNodes[1].localName, "br", "node 2");
+  assert_equals(parent.childNodes[2].localName, "br", "node 3");
+}, "Setting outerText to a bunch of newlines creates a bunch of <br>s with no text nodes");
+
+test(() => {
+  const node = document.getElementById("testRemove");
+  const parent = node.parentNode;
+
+  node.outerText = "";
+
+  assert_equals(parent.innerHTML, " removing node using outerText.");
+}, "Removing a node");
+
+test(() => {
+  const node = document.createElement("span");
+
+  assert_throws_dom("NoModificationAllowedError", () => { node.outerText = ""; });
+}, "Detached node");
+
+testText("<div>", "abc", "abc", "Simplest possible test");
+testHTML("<div>", "abc\ndef", "abc<br>def", "Newlines convert to <br> in non-white-space:pre elements");
+testHTML("<pre>", "abc\ndef", "abc<br>def", "Newlines convert to <br> in <pre> element");
+testHTML("<textarea>", "abc\ndef", "abc<br>def", "Newlines convert to <br> in <textarea> element");
+testHTML("<div style='white-space:pre'>", "abc\ndef", "abc<br>def", "Newlines convert to <br> in white-space:pre element");
+testHTML("<div>", "abc\rdef", "abc<br>def", "CRs convert to <br> in non-white-space:pre elements");
+testHTML("<pre>", "abc\rdef", "abc<br>def", "CRs convert to <br> in <pre> element");
+testHTML("<div>", "abc\r\ndef", "abc<br>def", "Newline/CR pair converts to <br> in non-white-space:pre element");
+testHTML("<div>", "abc\n\ndef", "abc<br><br>def", "Newline/newline pair converts to two <br>s in non-white-space:pre element");
+testHTML("<div>", "abc\r\rdef", "abc<br><br>def", "CR/CR pair converts to two <br>s in non-white-space:pre element");
+testHTML("<div style='white-space:pre'>", "abc\rdef", "abc<br>def", "CRs convert to <br> in white-space:pre element");
+testText("<div>", "abc<def", "abc<def", "< preserved");
+testText("<div>", "abc>def", "abc>def", "> preserved");
+testText("<div>", "abc&", "abc&", "& preserved");
+testText("<div>", "abc\"def", "abc\"def", "\" preserved");
+testText("<div>", "abc\'def", "abc\'def", "\' preserved");
+testHTML("<svg>", "abc", "<svg></svg>", "outerText not supported on SVG elements");
+testHTML("<math>", "abc", "<math></math>", "outerText not supported on MathML elements");
+testText("<div>", "abc\0def", "abc\0def", "Null characters preserved");
+testText("<div>", "abc\tdef", "abc\tdef", "Tabs preserved");
+testText("<div>", " abc", " abc", "Leading whitespace preserved");
+testText("<div>", "abc ", "abc ", "Trailing whitespace preserved");
+testText("<div>", "abc  def", "abc  def", "Whitespace not compressed");
+testText("<div>abc\n\n", "abc", "abc", "Existing text deleted");
+testText("<div><br>", "abc", "abc", "Existing <br> deleted");
+testHTML("<div>", "", "", "Assigning the empty string");
+testHTML("<div>", null, "", "Assigning null");
+testHTML("<div>", undefined, "undefined", "Assigning undefined");
+testHTML("<div>", "\rabc", "<br>abc", "Start with CR");
+testHTML("<div>", "\nabc", "<br>abc", "Start with LF");
+testHTML("<div>", "\r\nabc", "<br>abc", "Start with CRLF");
+testHTML("<div>", "abc\r", "abc<br>", "End with CR");
+testHTML("<div>", "abc\n", "abc<br>", "End with LF");
+testHTML("<div>", "abc\r\n", "abc<br>", "End with CRLF");
+
+function testText(startingHTML, outerText, expected, description) {
+  test(t => {
+    const container = document.getElementById("container");
+    t.add_cleanup(() => { container.textContent = ""; });
+
+    container.innerHTML = startingHTML;
+    const elementToReplace = container.firstElementChild;
+
+    elementToReplace.outerText = outerText;
+    assert_equals(container.textContent, expected);
+  }, description);
+}
+
+function testHTML(startingHTML, outerText, expected, description) {
+  test(t => {
+    const container = document.getElementById("container");
+    t.add_cleanup(() => { container.textContent = ""; });
+
+    container.innerHTML = startingHTML;
+    const elementToReplace = container.firstElementChild;
+
+    elementToReplace.outerText = outerText;
+    assert_equals(container.innerHTML, expected);
+  }, description);
+}
+</script>