The answer of your question can be found on KendoUI Web Overview:
Great UX across devices and browsers
(even the old ones)
A world with only HTML5-enabled browser can't come soon enough. Until then, you need tools that minimize the pain of supporting outdated browsers and maximize the performance. Kendo UI uses a mix of techniques to enable some HTML5 features in older browsers, and fine-tuned graceful degradation for others. Kendo UI is designed to support all major browsers, including: Internet Explorer 7+, Firefox ESR, Chrome, Safari 5+, and Opera 11+.
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI