The web should be accessible to everyone, regardless of their device or browser.
Kraken works in all major browsers, including IE 6. However, it's optimized for modern browsers, and IE 9+.
What does that mean?
Older browsers and less capable devices can still access content, but it might look a bit weird.
For example, because IE 8 and lower do not recognize media queries, they see the single-column small-screen layout instead of the fluid grid.
CSS3 properties like border radius, psuedo-selectors, and drop-shadows on things like buttons and forms aren't recognized by IE 6-8 and some mobile browsers like Opera Mini. Forms and buttons still work in those browsers—they just look a bit simpler.