Which browsers are supported by CK-12’s FlexBook® site?

  • We recommend that you use one of the following browsers with a minimum resolution of 1024 x 768. You need to enable JavaScript for any browser. For instructions on how to do this please click here:
    • Firefox 3.x and above
    • Internet Explorer 8.x and above
    • Safari 3.x and above
    • Chrome
  • The following browsers have not been tested with our FlexBook® system:
    • Opera
  • If you use Opera, or another browser, we would be interested to know about your experience. Please email: support@ck12.org.