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HTML 5

Sep 14, 2009, 22:34 (0 Talkback[s])
(Other stories by Arpan Dhandhania)

"Other than elements, HTML 5 also introduces additional capabilities to the browser like working in offline mode, multi-threaded JavaScript, etc. Let's go though some of the features.

"Offline Mode
With HTML 5, you can specify what resources your page will require and the browser will cache them so that the user can continue to use the page even if she gets disconnected from the internet. This wasn't a problem before AJAX came into existence as the page could not request for resources after it was loaded. However, today's webpages are designed to be sleek so that they load fast and then the additional resources are fetched asynchronously.

"Local Database
HTML 5 has included a local database that will be persistent through your session. The advantage of this is that you can fetch the required data and dump it into the local database. The page there after won't need to query the server to get and update data. It will use the local database. Every now and then, the data from the local database is synced with the server. This reduces the load on the server and speeds up responsiveness of the application.

"Native JSON
JSON, or JavaScript Simple Object Notation is a popular alternative to XML, which was almost the de-facto standard before the existence of JSON. Until HTML 5, you needed to include libraries to encode and decode JSON objects. Now, the JavaScript engine in that ships with HTML 5 has built-in support for encoding/decoding JSON objects.

"Cross Document Messaging
Another interesting addition to HTML 5 is the ability to perform messaging between documents of the same site. A good use of this would be in a blogging tool. In one window, you create your post and in another window, you can see what the post would look like without having to refresh the page. When you save the draft of your post, it immediately updates the view window."

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