diff --git a/pkg/expect/lib/expect.dart b/pkg/expect/lib/expect.dart
index 40775ea858d..c8e00136b93 100644
--- a/pkg/expect/lib/expect.dart
+++ b/pkg/expect/lib/expect.dart
@@ -484,6 +484,10 @@ class Expect {
    * the type of the exception you could write this:
    *
    *     Expect.throws(myThrowingFunction, (e) => e is MyException);
+   *
+   * If `f` fails an expectation (i.e., throws an [ExpectException]), that
+   * exception is not caught by [Expect.throws]. The test is still considered
+   * failing.
    */
   static void throws(void f(), [bool check(Object error), String reason]) {
     String msg = reason == null ? "" : "($reason)";
diff --git a/tests/lib_2/html/datalistelement_test.dart b/tests/lib_2/html/datalistelement_test.dart
index 07a3835e953..df87da03f76 100644
--- a/tests/lib_2/html/datalistelement_test.dart
+++ b/tests/lib_2/html/datalistelement_test.dart
@@ -31,35 +31,40 @@ main() {
     document.body.nodes.removeLast();
   });
 
-  // Support is checked in element_types test.
-  var expectation = DataListElement.supported ? returnsNormally : throws;
-
   test('is', () {
-    expect(() {
+    try {
       var list = document.query('#browsers');
       expect(list, isDataListElement);
-    }, expectation);
+    } catch (e) {
+      expect(DataListElement.supported, false);
+    }
   });
 
   test('list', () {
-    expect(() {
+    try {
       var list = document.query('#browsers') as DataListElement;
       var input = document.query('#input') as InputElement;
       expect(input.list, list);
-    }, expectation);
+    } catch (e) {
+      expect(DataListElement.supported, false);
+    }
   });
 
   test('options', () {
-    expect(() {
+    try {
       var options = (document.query('#browsers') as DataListElement).options;
       expect(options.length, 5);
-    }, expectation);
+    } catch (e) {
+      expect(DataListElement.supported, false);
+    }
   });
 
   test('create', () {
-    expect(() {
+    try {
       var list = new DataListElement();
       expect(list, isDataListElement);
-    }, expectation);
+    } catch (e) {
+      expect(DataListElement.supported, false);
+    }
   });
 }
diff --git a/tests/lib_2/lib_2_dart2js.status b/tests/lib_2/lib_2_dart2js.status
index ae0a33675b0..6e09990ef5d 100644
--- a/tests/lib_2/lib_2_dart2js.status
+++ b/tests/lib_2/lib_2_dart2js.status
@@ -166,7 +166,6 @@ html/custom/document_register_basic_test: Skip # Times out, or unittest times ou
 html/dart_object_local_storage_test: Skip # sessionStorage NS_ERROR_DOM_NOT_SUPPORTED_ERR
 html/element_animate_test/timing_dict: RuntimeError # Issue 26730
 html/element_classes_test: RuntimeError # Issue 27535
-html/element_types_constructors1_test: RuntimeError
 html/element_types_constructors4_test: RuntimeError
 html/element_types_content_test: Pass, RuntimeError # Issues 28983, 29922
 html/element_types_keygen_test: RuntimeError # Issue 29922