chromium/chrome/browser/resources/new_tab_page/untrusted/image.html

<!doctype html>
<html>
  <head>
    <style>
      html,
      body {
        height: 100%;
        width: 100%;
      }

      body {
        margin: 0;
        overflow: hidden;
      }

      img {
        max-height: 100%;
        max-width: 100%;
      }
    </style>
  </head>
  <body>
    <img src="$i18n{url}"></img>
  </body>
</html>