Основы языка разметки веб-страниц XHTML
XHTML (Extensible Hypertext Markup Language) is a markup language based on the XML (Extensible Markup Language) and HTML (Hypertext Markup Language) standards. XHTML combines the syntax of XML with the semantics of HTML, allowing for the creation of web pages that are easily interpreted and styled by browsers. XHTML was developed with the goal of replacing HTML and represents a stricter and more correct way of creating web pages. The main difference between XHTML and HTML is the XML syntax, which requires the closing of all tags and the use of lowercase for all elements and attributes. Additionally, XHTML supports all the features of HTML and provides additional capabilities through the use of XML. Here is an example of XHTML code: ```htmlHello, world!
This is my first web page created using XHTML.
``` In this example, we can see the main features of XHTML. First, we specify the DOCTYPE, which determines the XHTML standard we are using. Then, we declare the root element ``, where we specify the namespace and language of the document. In the document's head ``, we can specify various metadata, such as the page title, character encoding, and stylesheet inclusion. In this example, we are linking an external stylesheet `style.css`. In the document's body ``, we can place the content of the web page. In this example, we add a first-level heading `` and a paragraph `
` to show examples of textual content.
One of the features of XHTML is the strictness of its syntax and structure. Every element must be closed, even if it has no content. For example, `
` is a self-closing tag used for line breaks.
Another feature of XHTML is the use of attributes in a standard order and in lowercase. For example, `xmlns` and `xml:lang` are attributes that define the namespace and language of the document.
XHTML has several advantages over HTML. One advantage is its stricter document structure, which makes it easier to interpret and style. XHTML is also more compatible with other technologies and tools, such as CSS and JavaScript.
In conclusion, XHTML is an evolutionary step from HTML to XML, providing a stricter and more correct approach to creating web pages. It combines the advantages of XML and HTML, allowing for easy interpretation and styling of web pages by browsers. If you require a more precise and structured approach to web page markup, XHTML may be an excellent choice for you.