1 files changed, 54 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/dom/elements/global-attributes/dataset-delete.html b/testing/web-platform/tests/html/dom/elements/global-attributes/dataset-delete.html
new file mode 100644
index 0000000000..1440118f6d
--- /dev/null
+++ b/testing/web-platform/tests/html/dom/elements/global-attributes/dataset-delete.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Dataset - Delete</title>
+    <script src="/resources/testharness.js"></script>
+    <script src="/resources/testharnessreport.js"></script>
+  </head>
+  <body>
+    <h1>Dataset - Delete</h1>
+    <div id="log"></div>
+    <script>
+      function testDelete(attr, prop)
+      {
+        var d = document.createElement("div");
+        d.setAttribute(attr, "value");
+        delete d.dataset[prop];
+        return d.hasAttribute(attr) === false && d.getAttribute(attr) != "value";
+      }
+
+      function testDeleteNoAdd(prop)
+      {
+        var d = document.createElement("div");
+        delete d.dataset[prop];
+        return true;
+      }
+
+      test(function() { assert_true(testDelete('data-foo', 'foo')); },
+        "Deleting element.dataset['foo'] should also remove an attribute with name 'data-foo' should it exist.");
+      test(function() { assert_true(testDelete('data-foo-bar', 'fooBar')); },
+        "Deleting element.dataset['fooBar'] should also remove an attribute with name 'data-foo-bar' should it exist.");
+      test(function() { assert_true(testDelete('data--', '-')); },
+        "Deleting element.dataset['-'] should also remove an attribute with name 'data--' should it exist.");
+      test(function() { assert_true(testDelete('data--foo', 'Foo')); },
+        "Deleting element.dataset['Foo'] should also remove an attribute with name 'data--foo' should it exist.");
+      test(function() {
+        var d = document.createElement("div");
+        d.setAttribute('data--foo', "value");
+        assert_equals(d.dataset['-foo'], undefined);
+        assert_false('-foo' in d.dataset);
+        delete d.dataset['-foo'];
+        assert_true(d.hasAttribute('data--foo'));
+        assert_equals(d.getAttribute('data--foo'), "value");
+      }, "Deleting element.dataset['-foo'] should not remove an attribute with name 'data--foo' should it exist.");
+      test(function() { assert_true(testDelete('data---foo', '-Foo')); },
+        "Deleting element.dataset['-Foo'] should also remove an attribute with name 'data---foo' should it exist.");
+      test(function() { assert_true(testDelete('data-', '')); },
+        "Deleting element.dataset[''] should also remove an attribute with name 'data-' should it exist.");
+      test(function() { assert_true(testDelete('data-\xE0', '\xE0')); },
+        "Deleting element.dataset['\xE0'] should also remove an attribute with name 'data-\xE0' should it exist.");
+      test(function() { assert_true(testDeleteNoAdd('foo')); },
+        "Deleting element.dataset['foo'] should not throw if even if the element does now have an attribute with the name data-foo.");
+    </script>
+  </body>
+</html>