Fix the Screen and ScreenOrientation prototype

src/tests/html/error_event.html

@@ -0,0 +1,29 @@
+<script src="../testing.js"></script>
+
+<script id=ErrorEvent>
+  let e1 = new ErrorEvent('err1')
+  testing.expectEqual('', e1.message);
+  testing.expectEqual('', e1.filename);
+  testing.expectEqual(0, e1.lineno);
+  testing.expectEqual(0, e1.colno);
+  testing.expectEqual(undefined, e1.error);
+
+  let e2 = new ErrorEvent('err1', {
+     message: 'm1',
+     filename: 'fx19',
+     lineno: 443,
+     colno: 8999,
+     error: 'under 9000!',
+   });
+
+  testing.expectEqual('m1', e2.message);
+  testing.expectEqual('fx19', e2.filename);
+  testing.expectEqual(443, e2.lineno);
+  testing.expectEqual(8999, e2.colno);
+  testing.expectEqual('under 9000!', e2.error);
+</script>
+
+<script id=ErrorEvent>
+  let e3 = new ErrorEvent('err3')
+  e3.addEventListener('change', () => {});
+</script>

src/tests/html/screen.html

@@ -0,0 +1,20 @@
+<script src="../testing.js"></script>
+
+<script id=screen>
+  let screen = window.screen;
+  testing.expectEqual(1920, screen.width);
+  testing.expectEqual(1080, screen.height);
+
+  let orientation = screen.orientation;
+  testing.expectEqual(0, orientation.angle);
+  testing.expectEqual('landscape-primary', orientation.type);
+
+  // this shouldn't crash (it used to)
+  screen.addEventListener('change', () => {});
+</script>
+
+<script id=orientation>
+  screen.orientation.addEventListener('change', () => {})
+  // above shouldn't crash (it used to)
+  testing.skip();
+</script>