HTML doctype: правила и примеры

HTML-doctype

HTML-doctype is the first line you see in any valid HTML document. It informs the browser about the HTML version to work with and how to interpret the HTML code. This is a crucial line that determines the type of your document and influences how the browser processes and displays your web page.

Examples of different doctypes:

1. HTML5 doctype:

<!DOCTYPE html>

This doctype is used for documents written in HTML5. HTML5 is the latest version of HTML and offers many new features such as multimedia support, improved semantics, and APIs for web applications.

2. HTML 4.01 Strict doctype:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

This doctype is used for documents compliant with the HTML 4.01 Strict standard. The Strict version offers a stricter syntax control and lacks support for outdated or questionable elements.

3. HTML 4.01 Transitional doctype:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

This doctype is used for documents compliant with the HTML 4.01 Transitional standard. The Transitional version allows the usage of some outdated and non-semantic tags, such as and

, to ensure compatibility with older browsers.

4. XHTML 1.0 Strict doctype:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

This doctype is used for documents written in XHTML 1.0 Strict. XHTML is a combination of HTML and XML that provides stricter code validation and better compatibility with various browsers.

Setting the correct doctype is crucial for your web page as it allows the browser to correctly interpret and display your code. The absence or incorrect doctype can lead to unpredictable behavior of your web page and incompatibility with different browsers.

It is recommended to always use the HTML5 doctype if you are creating a new web page, as it is the latest and most supported version of HTML. However, if you are working with legacy code or require compatibility with older browsers, you can also use previous doctype versions.

I hope this information was helpful. If you have any further questions or need additional code examples, please let me know.