Advantages: * HTML is a free Language conceived by user for users * A HTML page could be read by any brand computers and provide the same result * Its distributed structure permits to exchange an element without change anything on the page where it is. This same element can be used many times without having to re designed it many times. * Network link: We can integrate local elements into a personal web page or to remote surfers and elements which we integrates address (URL). * Hypertext permits to manage different information without have to store them locally
Advantages
Easy to use
Loose syntax (although, being too flexible will not comply with standards)
Supported on almost every browser, if not all browsers.
Widely used; established on almost every website, if not all websites.
Very similar to XML syntax, which is increasingly used for data storage
Free - You need not buy any software
Easy to learn & code even for novice programmers
Disadvantages
* It cannot produce dynamic output alone, since it is a static language * Sometimes, the structuring of HTML documents is hard to grasp * You have to keep up with deprecated tags, and make sure not to use them * Deprecated tags appear because another language that works with HTML has replaced the original work of the tag; thus the other language needs to be learned (most of the time, it is CSS) * Security features offered by HTML are limited

Disadvantages: * Its distributed structure (external links) makes storage difficult; it’s easy to loose or forget an element without realising it. * The web pages storage is done on several files. * The web page designed possibilities are limited and not easy to realise (e.g. frames)

HyperText Markup Language (HTML) is a format that allows to define the different elements of a web page that could be viewed thanks to a browser (e.g.: Internet Explorer, Netscape, Opera etc…). HTML defines: * Text * Text presentation. * Pictures place and size * The positioning of animations and sounds. * Any place of a static or dynamic elements on the page managed by the browser * Hypertext links Thus HTML is the language use to design any things that can be view on the WEB. HTML was conceived by CERN scientists, without any commercial perspectives but to exchange information beyond computers, networks etc… boundaries. HTML just defines text and establishes a link toward every elements of a page: the pictures, the animations, sounds and so on are not included but theirs Uniform Resources Locators (URLs) are indicated. HTML is designed to connect many and scattered information. The concept of network is thus central. This html extension defines the HTML format for the pc. What’s the usability of HTML ? To define web pages. Web pages are always designed with this language, that browser interpret the source code, goes to search external elements (pictures, sounds…) and reconstitute the complete web page that it presents Surfer on theirs screens.
There are successive versions of this language, allowing to define more finely the page-setting and the typography. Define web page on a local computer. It’s possible to define local web pages on a standalone machine and read them thanks to Browser without using any internet connection. It’s possible to design them and work on it into a LAN too.

7 Benefits of HTML validation

1. Web Site Accessibility - validating your html code helps to pinpoint areas of potential blockage that could prevent search engine spiders or visitors from accessing your website. When you run your site through a code validator it may produce many errors that need to be corrected so your pages will render well. ie include text with your “alt” tags for every < img > tag.
Why should you do this?
-Allows your site to be accessible to a larger audience (vision impaired, motor skill impaired, cognitive impaired)
-Allows your site to be accessed by wider range of devices (hand helds, screen readers, text browsers, search engines)
-Is a requirement for Federal and State Government sites

2. Search engine friendly pages - clean and simple code enables search engines to spider your pages more quickly and completely.
Here’s an example:
What’s wrong with this code?
< p keyword1 sentence, well written copy, etc.
< p > keyword2 paragraph with more choice content.
This code is missing a “>” The issue is not that the page will necessarily get skipped altogether but that the “keyword1″ sentence looks like part of the tag – like a tag attribute. So the words in the “keyword1″ sentence probably won’t be included in the search engines computations, even though the page itself will be indexed.
Once a spider sees a correct tag further along in the page, then it’s back on course. So, the keyword2 paragraph would make it.
3. Faster Loading – if your web page contains html errors it will take a longer time for the search engines to spider it, therefore slowing the loading time. If your page doesn’t load in under 10 seconds your visitors may click away to your competitors’ sites.
4. Less load on servers – clean and simple code won’t tax your server as much as a site which has complicated code or contain many nested tables. Cascading style sheets (CSS) will greatly reduce the amount of code within your web pages. This will also cut down on the amount of web space and bandwidth used thus saving you money for hosting your site.

5. Easier to update and maintain web site – with no mistakes in your html code it is easier and faster to make changes to your web pages. For web site designers, this means you will save time and money when maintaining clients’ sites.
6. Browser compatibility – validated code ensures your site is compatible with the current browsers and future browsers. You might say “well, it looks fine in Internet Explorer, so why bother with any other browsers?” Current browsers will continue to update their rules and future browsers will make sure they are html compliant.
7. Access more visitors - if you ensure your web pages appear correctly in all the major browsers you will be able to reach a larger audience which then increases the potential of your site to make more sales.