p(() => {
                      assert_equals(resize_event_count, 1);
                      t.done();
                    });
                  }) }); // 2x requestAnimationFrame
                })
              };
            });
          }, "Resize event fired when an iframe is shown.");
        </script>
    </head>
    <body>
        <h1>Viewport: Resize Event On Iframe Size Change</h1>
        <h4>
          Test Description: This test ensures that we fire a resize event when
          an iframe is sh