A brief analysis of how HTML works

HTML is a markup language commonly used to create web pages. After creating a web page, the HTML code needs to be run to display the content and style of the web page. So, how does HTML work?

HTML is a markup language that runs through the browser. When a user enters a URL in the browser or clicks a link, the browser sends a request to the server to obtain the HTML code of the web page. After receiving the request, the server will send the HTML code of the web page back to the browser. The HTML code received by the browser contains the content, style and structure information of the web page.

After the browser receives the HTML code, it will parse the code according to HTML syntax rules and generate a DOM (Document Object Model) tree. The DOM tree is a tree structure that uses all elements in the HTML document (such as titles, paragraphs, pictures, etc.) as nodes, and the relationship between nodes is from parent nodes to child nodes. The DOM tree is a data structure used by browsers to describe the structure of HTML documents.

After generating the DOM tree, the browser will apply CSS and JavaScript codes to each element in the DOM tree, and render the style of the web page according to the style rules of HTML and CSS. JavaScript can be used to implement dynamic effects and interactive behaviors, such as button clicks, mouse scrolling, etc. All these effects are achieved by modifying the DOM tree or adding CSS classes to HTML elements.

The browser will then present the rendered web page to the user's screen. Users can interact with web pages, such as clicking links, filling out forms, etc. These interactive behaviors may cause the browser to re-request new HTML code, thus updating the web page content.

In short, HTML is a markup language. When the browser runs the HTML code, it will face multiple steps, including requesting the HTTP server to obtain the corresponding HTML code, parsing the HTML code to generate a DOM tree, and rendering the HTML. Apply CSS styles to present the final web page content to users.

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