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diff --git a/testing/web-platform/tests/dom/nodes/CharacterData-replaceData.html b/testing/web-platform/tests/dom/nodes/CharacterData-replaceData.html
new file mode 100644
index 0000000000..537751d832
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/CharacterData-replaceData.html
@@ -0,0 +1,163 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>CharacterData.replaceData</title>
+<link rel=help href="https://dom.spec.whatwg.org/#dom-characterdata-replacedata">
+<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) {
+  // Step 2.
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    assert_throws_dom("IndexSizeError", function() { node.replaceData(5, 1, "x") })
+    assert_throws_dom("IndexSizeError", function() { node.replaceData(5, 0, "") })
+    assert_throws_dom("IndexSizeError", function() { node.replaceData(-1, 1, "x") })
+    assert_throws_dom("IndexSizeError", function() { node.replaceData(-1, 0, "") })
+    assert_equals(node.data, "test")
+  }, type + ".replaceData() with invalid offset")
+
+  // Step 3.
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(2, 10, "yo")
+    assert_equals(node.data, "teyo")
+  }, type + ".replaceData() with clamped count")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(2, -1, "yo")
+    assert_equals(node.data, "teyo")
+  }, type + ".replaceData() with negative clamped count")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(0, 0, "yo")
+    assert_equals(node.data, "yotest")
+  }, type + ".replaceData() before the start")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(0, 2, "y")
+    assert_equals(node.data, "yst")
+  }, type + ".replaceData() at the start (shorter)")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(0, 2, "yo")
+    assert_equals(node.data, "yost")
+  }, type + ".replaceData() at the start (equal length)")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(0, 2, "yoa")
+    assert_equals(node.data, "yoast")
+  }, type + ".replaceData() at the start (longer)")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(1, 2, "o")
+    assert_equals(node.data, "tot")
+  }, type + ".replaceData() in the middle (shorter)")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(1, 2, "yo")
+    assert_equals(node.data, "tyot")
+  }, type + ".replaceData() in the middle (equal length)")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(1, 1, "waddup")
+    assert_equals(node.data, "twaddupst")
+    node.replaceData(1, 1, "yup")
+    assert_equals(node.data, "tyupaddupst")
+  }, type + ".replaceData() in the middle (longer)")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(1, 20, "yo")
+    assert_equals(node.data, "tyo")
+  }, type + ".replaceData() at the end (shorter)")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(2, 20, "yo")
+    assert_equals(node.data, "teyo")
+  }, type + ".replaceData() at the end (same length)")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(4, 20, "yo")
+    assert_equals(node.data, "testyo")
+  }, type + ".replaceData() at the end (longer)")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(0, 4, "quux")
+    assert_equals(node.data, "quux")
+  }, type + ".replaceData() the whole string")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.replaceData(0, 4, "")
+    assert_equals(node.data, "")
+  }, type + ".replaceData() with the empty string")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.data = "This is the character data test, append 資料，更多資料";
+
+    node.replaceData(33, 6, "other");
+    assert_equals(node.data, "This is the character data test, other 資料，更多資料");
+    node.replaceData(44, 2, "文字");
+    assert_equals(node.data, "This is the character data test, other 資料，更多文字");
+  }, type + ".replaceData() with non-ASCII data")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.data = "🌠 test 🌠 TEST"
+
+    node.replaceData(5, 8, "--");  // Counting UTF-16 code units
+    assert_equals(node.data, "🌠 te--ST");
+  }, type + ".replaceData() with non-BMP data")
+}
+
+testNode(function() { return document.createTextNode("test") }, "Text")
+testNode(function() { return document.createComment("test") }, "Comment")
+</script>