While cookies have been used to track unique user data for years, they have serious disadvantages. The largest flaw is that all of your cookie data is added to every HTTP request header. This can end up having a measurable impact on response time, especially during XHRs. So a best practice is to reduce cookie size. In HTML5 we can do better than that: use sessionStorage and localStorage in place of cookies. Check it out!!!!
Web Workers have two significant benefits: 1) They are fast. 2) While they chug on your tasks, the browser remains responsive. Grab a look at the HTML5 Slide Deck for Workers in action.
Using the native widgets here means you don't need to send the heavy javascript and css required to pull off these widgets, speeding up page load and likely improving widget responsiveness. To try out some of these input enhancements check out the HTML5 Slide deck.
Re-narration by Manu in English targeting Rudrapur for this web page
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