1 files changed, 45 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/dom/elements/global-attributes/dataset-binding.window.js b/testing/web-platform/tests/html/dom/elements/global-attributes/dataset-binding.window.js
new file mode 100644
index 0000000000..e0e85677d1
--- /dev/null
+++ b/testing/web-platform/tests/html/dom/elements/global-attributes/dataset-binding.window.js
@@ -0,0 +1,45 @@
+[9, "x"].forEach(function(key) {
+  test(function() {
+    var element = document.createElement("div");
+    var dataset = element.dataset;
+
+    var value = "value for " + this.name;
+
+    assert_equals(dataset[key], undefined);
+
+    element.setAttribute("data-" + key, value);
+    assert_equals(element.getAttribute("data-" + key), value);
+    assert_equals(dataset[key], value);
+
+    var propdesc = Object.getOwnPropertyDescriptor(dataset, key);
+    assert_not_equals(propdesc, undefined);
+    assert_equals(propdesc.value, value);
+    assert_true(propdesc.writable);
+    assert_true(propdesc.enumerable);
+    assert_true(propdesc.configurable);
+  }, "Getting property descriptor for key " + key);
+
+  test(function() {
+    var element = document.createElement("div");
+    var dataset = element.dataset;
+
+    var proto = "proto getter for " + this.name;
+    var calledSetter = [];
+    Object.defineProperty(DOMStringMap.prototype, key, {
+      "get": function() { return proto; },
+      "set": this.unreached_func("Should not call [[Set]] on prototype"),
+      "configurable": true,
+    });
+    this.add_cleanup(function() {
+      delete DOMStringMap.prototype[key];
+    });
+
+    var value = "value for " + this.name;
+
+    assert_equals(dataset[key], proto);
+    assert_equals(element.getAttribute("data-" + key), null);
+    assert_equals(dataset[key] = value, value);
+    assert_equals(dataset[key], value);
+    assert_equals(element.getAttribute("data-" + key), value);
+  }, "Setting property for key " + key + " with accessor property on prototype");
+});