Differences between Html4 and Html5

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HTML5 has several goals which differentiate it from HTML4.

The primary one is consistent, defined error handling. As you know, HTML purposely supports 'tag soup', or the ability to write malformed code and have it corrected into a valid document. The problem is that the rules for doing this aren't written down anywhere. When a new browser vendor wants to enter the market, they just have to test malformed documents in various browsers (especially IE) and reverse-engineer their error handling. If they don't, then many pages won't display correctly (estimates place roughly 90% of pages on the net as being at least somewhat malformed).

So, HTML5 is attempting to discover and codify this error handling, so that browser developers can all standardize and greatly reduce the time and money required to display things consistently. As well, long in the future after HTML has died as a document format, historians may still want to read our documents, and having a completely defined parsing algorithm will greatly aid this.

The secondary goal of HTML5 is to develop the ability of the browser to be an application platform, via HTML, CSS, and Javascript. Many elements have been added directly to the language that are currently (in HTML4) Flash or JS-based hacks, such as <canvas>, <video>, and <audio>. Useful things such as Local Storage (a js-accessible browser-builtin sql database, for storing information beyond what cookies can hold), new input types such as date for which the browser can expose easy user interface (so that we don't have to use our js-based calendar date-pickers), and browser-supported form validation will make developing web applications much simpler for the developers, and make them much faster for the users (since many things will be supported natively, rather than hacked in via javascript).

There are many other smaller efforts taking place in HTML5, such as better-defined semantic roles for existing elements (<strong> and <em> now actually mean something different, and even <b> and <i> have vague semantics that should work well when parsing legacy documents) and adding new elements with useful semantics - <article>, <section>, <header>, <aside>, and <nav> should replace the majority of <div>s used on a web page, making your pages a bit more semantic, but more importantly, easier to read. No more painful scanning to see just what that random </div> is closing - instead you'll have an obvious </header>, or </article>, making the structure of your document much more intuitive.


Differences :
                    HTML                                                                                 HTML5

HTML
HTML5

DOCTYPE is much longer as HTML4 is based on SGML-based.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" 
"http://www.w3.org/TR/html4/strict.dtd">
DOCTYPE is required to enable standards mode for HTML documents. 
<!DOCTYPE html>
Audio and Video are not part of HTML4 specification
Audio and Videos are integral part of HTML5 specifications e.g. <audio> and <video> tags
Vector Graphics is possible with the help of technologies such as VML, Silverlight, Flash etc.
Vector graphics is integral part of HTML5 e.g. SVG and canvas
It is almost impossible to get true GeoLocation of user browsing any website especially if it comes to mobile devices.
JS GeoLocation API in HTML5 helps identify location of user browsing any website (provided user allows it)

Browser cache can be used as temporary storage.
Application Cache, Web SQL database and Web storage is available as client side storage. Accessible usingJavaScript interface in HTML5 compliant browsers.

Web Sockets are not available. Generally used mechanisms are long polling and streaming.
Full duplex communication channels can be established with Server using Web Sockets. Accessible using JavaScript interface in HTML5 compliant browsers.

Works with all old browsers
Most of modern browser have started supporting HTML5 specification e.g. Firefox, Mozilla, Opera, Chrome, Safari  etc.

Does not allow JavaScript to run in browser. JS runs in same thread as browser interface.
Allows JavaScript to run in background. This is possible due to JS Web worker API in HTML5



Tags : Html5, Html4, Difference between Html4 and Html5

Comments

  1. Admiral AdneyJuly 11, 2012 at 1:10 AM

    I was searching for symfony web development and landed up on your post and i must say thanks for sharing such useful information.

    ReplyDelete

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