Naming New Tab with Image

I am trying to rename a new tab I am opening up. This new tab contains an iframe with an image as the source. This is how I am opening the tab, but can't seem to get document.title to work.

var customTab = window.open();
customTab && customTab.document.title = 'My new tab';//this doesn't work
customTab &&
  customTab.document.write(
    '<iframe src="' +
      myImage +
      '" style="border: none;"></iframe>'
  );

Any ideas would be much appreciated.

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