the latest HTML VS HTML 5

Hello guys,
Today, i will give you information about HTML(or HTML version 4 to be specific) and HTML 5,
the difference, function, feature and deficiency between them.

Before we get there, we must know what is HTML?
I will give a simple description, HTML (Hyper Text Markup Language) is a markup language(language that combine text and information) that used for create a website.
There is more programming language to make a web, such as PHP, JSP and many more but the famous one is HTML.
now, HTML is internet standard that controlled by W3C (World Wide Web Consortium) that will created HTML 5(still in progress right now). The first version of HTML was created by Caillau TIM and Berners-lee robert when they are work at CERN on 1989.

Then, what is the difference between HTML that now we used (HTML 4) with the "still working project" HTML 5?
Firstly, In HTML 4 ,Vector Graphics is possible with the help of technologies such as VML, Silverlight, Flash etc. but in HTML 5, Vector graphics is integral part of HTML5 e.g. SVG and canvas.

Next is Audio and Video are not part of HTML4 specification, but Audio and Videos are integral part of HTML5 specifications e.g.
Then, Browser cache can be used as temporary storage on HTML 4, but on HTML 5 ,Application Cache, Web SQL database and Web storage is available as client side storage. Accessible using JavaScript interface in HTML5 compliant browsers.
And HTML 4 Works on all old browsers , but Most of modern browser have started supporting HTML5 specification e.g. Firefox, Mozilla, Opera, Chrome, Safari  etc.
Last is in HTML 4, Does not allow JavaScript to run in browser. JS runs in same thread as browser interface, but in HTML 5 ,Allows JavaScript to run in background. This is possible due to JS Web worker API in HTML5.

So, for me its the fact that the latest version of any kind program, the better performance it can make.
Better prepare for the release of HTML 5 guys!