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diff --git a/testing/web-platform/tests/dom/nodes/CharacterData-surrogates.html b/testing/web-platform/tests/dom/nodes/CharacterData-surrogates.html
new file mode 100644
index 000000000..ff1014c5f
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/CharacterData-surrogates.html
@@ -0,0 +1,74 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Splitting and joining surrogate pairs in CharacterData methods</title>
+<link rel=help href="https://dom.spec.whatwg.org/#dom-characterdata-substringdata">
+<link rel=help href="https://dom.spec.whatwg.org/#dom-characterdata-replacedata">
+<link rel=help href="https://dom.spec.whatwg.org/#dom-characterdata-insertdata">
+<link rel=help href="https://dom.spec.whatwg.org/#dom-characterdata-deletedata">
+<link rel=help href="https://dom.spec.whatwg.org/#dom-characterdata-data">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<div id="log"></div>
+<script>
+function testNode(create, type) {
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.data = "🌠 test 🌠 TEST"
+
+    assert_equals(node.substringData(1, 8), "\uDF20 test \uD83C")
+  }, type + ".substringData() splitting surrogate pairs")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.data = "🌠 test 🌠 TEST"
+
+    node.replaceData(1, 4, "--");
+    assert_equals(node.data, "\uD83C--st 🌠 TEST");
+
+    node.replaceData(1, 2, "\uDF1F ");
+    assert_equals(node.data, "🌟 st 🌠 TEST");
+
+    node.replaceData(5, 2, "---");
+    assert_equals(node.data, "🌟 st---\uDF20 TEST");
+
+    node.replaceData(6, 2, " \uD83D");
+    assert_equals(node.data, "🌟 st- 🜠 TEST");
+  }, type + ".replaceData() splitting and creating surrogate pairs")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.data = "🌠 test 🌠 TEST"
+
+    node.deleteData(1, 4);
+    assert_equals(node.data, "\uD83Cst 🌠 TEST");
+
+    node.deleteData(1, 4);
+    assert_equals(node.data, "🌠 TEST");
+  }, type + ".deleteData() splitting and creating surrogate pairs")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.data = "🌠 test 🌠 TEST"
+
+    node.insertData(1, "--");
+    assert_equals(node.data, "\uD83C--\uDF20 test 🌠 TEST");
+
+    node.insertData(1, "\uDF1F ");
+    assert_equals(node.data, "🌟 --\uDF20 test 🌠 TEST");
+
+    node.insertData(5, " \uD83D");
+    assert_equals(node.data, "🌟 -- 🜠 test 🌠 TEST");
+  }, type + ".insertData() splitting and creating surrogate pairs")
+}
+
+testNode(function() { return document.createTextNode("test") }, "Text")
+testNode(function() { return document.createComment("test") }, "Comment")
+</script>