HTML
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HTML5
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| 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 |
I am not expert in HTML5 and neither in HTML4 specifications. These are just few set of differences in HTML Vs HTML5 that I compiled for immediate reference.
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