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diff --git a/testing/web-platform/tests/dom/nodes/CharacterData-insertData.html b/testing/web-platform/tests/dom/nodes/CharacterData-insertData.html
new file mode 100644
index 0000000000..62c0ca1018
--- /dev/null
+++ b/testing/web-platform/tests/dom/nodes/CharacterData-insertData.html
@@ -0,0 +1,90 @@
+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>CharacterData.insertData</title>
+<link rel=help href="https://dom.spec.whatwg.org/#dom-characterdata-insertdata">
+<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")
+
+    assert_throws_dom("INDEX_SIZE_ERR", function() { node.insertData(5, "x") })
+    assert_throws_dom("INDEX_SIZE_ERR", function() { node.insertData(5, "") })
+  }, type + ".insertData() out of bounds")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    assert_throws_dom("INDEX_SIZE_ERR", function() { node.insertData(-1, "x") })
+    assert_throws_dom("INDEX_SIZE_ERR", function() { node.insertData(-0x100000000 + 5, "x") })
+  }, type + ".insertData() negative out of bounds")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.insertData(-0x100000000 + 2, "X")
+    assert_equals(node.data, "teXst")
+  }, type + ".insertData() negative in bounds")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.insertData(0, "")
+    assert_equals(node.data, "test")
+  }, type + ".insertData('')")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.insertData(0, "X")
+    assert_equals(node.data, "Xtest")
+  }, type + ".insertData() at the start")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.insertData(2, "X")
+    assert_equals(node.data, "teXst")
+  }, type + ".insertData() in the middle")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.insertData(4, "ing")
+    assert_equals(node.data, "testing")
+  }, type + ".insertData() at the end")
+
+  test(function() {
+    var node = create()
+    node.data = "This is the character data, append more 資料，測試資料";
+
+    node.insertData(26, " test");
+    assert_equals(node.data, "This is the character data test, append more 資料，測試資料");
+    node.insertData(48, "更多");
+    assert_equals(node.data, "This is the character data test, append more 資料，更多測試資料");
+  }, type + ".insertData() with non-ascii data")
+
+  test(function() {
+    var node = create()
+    assert_equals(node.data, "test")
+
+    node.data = "🌠 test 🌠 TEST"
+
+    node.insertData(5, "--");  // Counting UTF-16 code units
+    assert_equals(node.data, "🌠 te--st 🌠 TEST");
+  }, type + ".insertData() with non-BMP data")
+}
+
+testNode(function() { return document.createTextNode("test") }, "Text")
+testNode(function() { return document.createComment("test") }, "Comment")
+</script>