title: This is a snackbar message appearing in printouts
body: <p>I've purchased and installed the highcharts editor</p>
  
  <p><a href="http://www.highcharts.com/products/highcharts-editor" rel="nofollow noreferrer">http://www.highcharts.com/products/highcharts-editor</a></p>
  
  <p>by including the relevant JS and CSS files in my HTML templates. </p>
  
  <p>However, whenever a browser page is printed, a box with the text 'This is a snackbar' and an 'action' button appears.</p>
  
  <p>It doesn't appear on screen in the browser, only when the print dialog is opened, from the second page as per the attached screenshot.</p>
  
  <p>What is it and how can it be removed?</p>
  
  <p>The browser is Google Chrome.</p>
  
  <p><a href="https://i.stack.imgur.com/gsh3L.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gsh3L.png" alt="snackbar"></a></p>