Well it was never my intent to list all possible modern browsers, there must be hundreds. However, if you're running Windows 10 and using Spartan, you could change that line to say this:
This interactive crossword puzzle requires JavaScript and any modern web browser (e.g., Microsoft Internet Explorer or Spartan, Mozilla Firefox, Google Chrome, or Apple Safari). If you have <font color="<%=strHiliteFontColor%>">disabled</font> web page scripting, please re-enable it and refresh the page. If this web page is saved on your computer, you may need to click the information bar at the top or bottom of the page to allow the puzzle to load.