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HTML tutorial on USA 2017 Versions of HTML: 5, 4.01, XHTML, etc. Lesson 01.4. HTML language from the date of its creation up to today has been developed in hard fighting between teams of great specialists in IT technology. As a results we have got a some mixture with different standards. It's not so easy to understand how to work with these standards. In this lesson you will know common DOCTYPE declarations for setting a required HTML version.
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Versions of HTML: 5, 4.01, XHTML, etc. Lesson 01.4.

HTML language from the date of its creation up to today has been developed in hard fighting between teams of great specialists in IT technology. As a results we have got a some mixture with different standards. It's not so easy to understand how to work with these standards. Since the early days of the Internet, there have been many versions of HTML: HTML (1990); HTML 2.0 (1995); HTML 3.2 (1997); HTML 4.01 (1999); XHTML (2000); HTML5 (2012).

Everything are changing all the time. Some things are correct today, but become wrong tomorrow.

NB. From now and on, we will use all dates in USA standard: MM/DD/YYYY

I created this web page:
  13:52:17

You studied this web page:
  **:**:**

When I created this web page, very right option was: good and perspective HTML version is HTML 5.

But from the moment of this page creation passed by... let me count all minutes and seconds...
** years, ** months, ** days, ** hours, ** minutes, ** seconds...

... something may changed from this time, I guess...

We can reduce influence of factor called "many minutes passed by from this old good time" by using our built-in lab works. These lab works let us get actual information about HTML versions people like use today and about another important things.

This web page has been created on version HTML 5, we will use this version mostly further.

<!DOCTYPE html>
	<!--// The line above show that we use version HTML 5 //-->


Have a look about other HTML version that tag !DOCTYPE may set.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
	<!--// The line above show that we use version HTML 4.01 Strict //-->

This DTD (DOCTYPE declaration) contains all HTML elements and attributes, but does not include presentational or deprecated elements (like center, font, etc.). Framesets are not allowed.


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
	<!--// The line above show that we use version HTML 4.01 Transitional //-->

This DTD contains all HTML elements and attributes, including presentational and deprecated elements (like center, font, etc). Framesets are not allowed.


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
	<!--// The line above show that we use version HTML 4.01 Transitional //-->

This DTD contains all HTML elements and attributes, including presentational and deprecated elements (like center, font, etc). Framesets are not allowed.


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Frameset//EN" "http://www.w3.org/TR/html4/frameset.dtd">
	<!--// The line above show that we use version HTML 4.01 Frameset //-->

This DTD is equal to HTML 4.01 Transitional, but framesets are allowed in this version.


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
	<!--// The line above show that we use version XHTML 1.0 Strict //-->

This DTD contains all HTML elements and attributes, but does not include presentational or deprecated elements (like font). Framesets are not allowed. The markup must also be written as well-formed XML.


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
	<!--// The line above show that we use version XHTML 1.0 Transitional //-->

This DTD contains all HTML elements and attributes, INCLUDING presentational and deprecated elements (like font). Framesets are not allowed. The markup must also be written as well-formed XML.


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Frameset//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
	<!--// The line above show that we use version XHTML 1.0 Frameset //-->

This DTD is equal to XHTML 1.0 Transitional, but allows the use of frameset content.


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
	<!--// The line above show that we use version XHTML 1.1 //-->

This DTD is equal to XHTML 1.0 Strict, but allows you to add modules (to provide ruby support for East-Asian languages).

Lamp If you don't know what a version get in use right now, use version HTML 5. Other version we have to know only to understand code made by webmasters in old good faraway past.

In this lesson we have studied HTML tags:
The <!DOCTYPE> declaration must be the 1st thing in your HTML document, before the <html> tag.

The <!DOCTYPE> declaration is not an HTML tag. It is an instruction for the web browser about what version of HTML the page is written in.

In HTML 4.01, the <!DOCTYPE> declaration refers to a DTD, because HTML 4.01 was based on SGML. The DTD specifies the rules for the markup language, so that the browsers render the content correctly.

HTML5 is not based on SGML, and therefore does not require a reference to a DTD.

Always add the <!DOCTYPE> declaration to your HTML documents, so that the browser knows what type of document to expect.

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