What are Web standards and W3C standards?-HTML Tutorial-php.cn

What are Web standards and W3C standards?

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Release： 2024-02-19 14:28:05

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What are Web standards and W3C standards, specific code examples are required

Web standards are a series of technical specifications and best practices, which are established by W3C (World Wide Web Consortium) and recommended to developers. Its purpose is to ensure that web pages display the same way across different devices and browsers.

W3C is an international organization founded in 1994 by Internet pioneer Tim Berners-Lee and is committed to formulating and promoting Web standards. It is made up of major companies, organizations and individuals working together to ensure the interoperability and sustainability of the Web. The standards developed and published by W3C are widely used in fields such as web design, development and browser manufacturing.

The implementation of Web standards is mainly implemented through technologies such as HTML (Hypertext Markup Language), CSS (Cascading Style Sheets) and JavaScript. These technologies will be introduced below and specific code examples will be given.

HTML is a markup language used to describe the structure of web pages. It uses tags to define different document elements. The following is a simple HTML code example:

<!DOCTYPE html>
<html>
<head>
<title>网页标题</title>
</head>
<body>
<h1>这是一个标题</h1>
<p>这是一个段落。</p>
</body>
</html>

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In this example, <!DOCTYPE html> is a document type declaration that tells the browser to use HTML5 to parse the page. The <html> tag represents the root element of the HTML document. <head> tag is used to define the head information of the document, such as the title and referenced external resources. The <title> tag defines the title of the web page. The <body> tag contains the main content of the web page, such as the title and paragraphs. The <h1> and  tags are common elements of HTML and are used to define titles and paragraphs respectively.

CSS is a style sheet language used to control the style of web pages. It allows developers to define the appearance of elements through selectors and attributes. Here is a simple CSS code example:

h1 {
    color: blue;
    font-size: 24px;
}

p {
    color: red;
    font-size: 16px;
}

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In this example, the h1 selector is used to select all <h1> elements and change their text color Set to blue and font size to 24 pixels. The p selector is used to select all  elements and sets their text color to red and font size to 16 pixels. Developers can define different styles as needed.

JavaScript is a scripting language that allows developers to add interactive and dynamic features to web pages. The following is a simple JavaScript code example:

function changeColor() {
    var heading = document.getElementById("heading");
    heading.style.color = "green";
}

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In this example, the changeColor function is used to change the id to heading The text color is green. This function can be triggered by an event, such as when a button is clicked.

In addition to HTML, CSS and JavaScript, web standards also include other technical specifications, such as DOM (Document Object Model) and XML (Extensible Markup Language). DOM allows developers to manipulate the structure and content of HTML documents through scripting languages, while XML is used to write custom markup languages.

In summary, Web standards and W3C standards are specifications and best practices to ensure that Web pages display correctly and interoperate across different devices and browsers. Developers can use HTML, CSS, JavaScript and other technologies to implement and comply with these standards. The above provides some simple code examples that developers can extend and improve as needed.

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