1 files changed, 54 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-return-value.html b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-return-value.html
new file mode 100644
index 0000000000..2a80de65a1
--- /dev/null
+++ b/testing/web-platform/tests/html/semantics/interactive-elements/the-dialog-element/dialog-return-value.html
@@ -0,0 +1,54 @@
+<!DOCTYPE html>
+<html>
+<head>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+</head>
+<body>
+<dialog></dialog>
+<script>
+test(function() {
+    dialog = document.querySelector('dialog');
+    assert_equals(dialog.returnValue, '');
+
+    dialog.returnValue = 'Setting value directly';
+    assert_equals(dialog.returnValue, 'Setting value directly');
+
+    dialog.returnValue = null;
+    assert_equals(dialog.returnValue, 'null');
+
+    dialog.returnValue = '';
+    assert_equals(dialog.returnValue, '');
+
+    dialog.returnValue = 7;
+    assert_equals(dialog.returnValue, '7');
+
+    dialog.show();
+    dialog.close('Return value set from close()');
+    assert_equals(dialog.returnValue, 'Return value set from close()');
+
+    dialog.show();
+    dialog.close('');
+    assert_equals(dialog.returnValue, '');
+
+    dialog.show();
+    dialog.close(null);
+    assert_equals(dialog.returnValue, 'null');
+
+    dialog.returnValue = 'Should not change because no argument to close()';
+    dialog.show();
+    dialog.close();
+    assert_equals(dialog.returnValue, 'Should not change because no argument to close()');
+
+    dialog.returnValue = 'Should not change because of undefined argument to close()';
+    dialog.show();
+    dialog.close(undefined);
+    assert_equals(dialog.returnValue, 'Should not change because of undefined argument to close()');
+
+    dialog.returnValue = 'Should not change because of no-op close()';
+    dialog.close('blah');
+    assert_equals(dialog.returnValue, 'Should not change because of no-op close()');
+}, "Tests dialog.returnValue is settable and returns the last value set.");
+</script>
+</body>
+</html>