What happens when you double click on the index.html file in your file explorer?

When you double click on the index.html file in your file explorer, it typically opens the file in your default web browser. This action triggers the browser to interpret the HTML code within the file and render it as a web page. The index.html file is often considered the main entry point for a website or web application.

Upon opening the index.html file, the browser starts parsing the HTML code from top to bottom. It interprets the HTML tags and their attributes to structure the content and apply styling. The browser also loads any external resources referenced in the HTML, such as CSS stylesheets, JavaScript files, images, and fonts.

If the index.html file contains CSS stylesheets, the browser fetches and applies those styles to the HTML elements. This allows the browser to render the content with the specified colors, fonts, layout, and other visual properties defined in the CSS.

In addition to CSS, the index.html file may include JavaScript code. When the browser encounters a script tag, it executes the JavaScript within it. JavaScript provides interactivity and dynamic behavior to the web page. It can manipulate the HTML elements, handle user interactions, fetch data from servers, and perform various computations and operations.

For example, suppose the index.html file contains a button with an onclick event handler defined in JavaScript. When the user clicks the button, the associated JavaScript code executes, performing the specified actions, such as displaying an alert message or updating the page content.

Furthermore, the index.html file may reference external JavaScript files. These files can contain reusable functions, classes, or modules that enhance the functionality of the web page. When the browser encounters a script tag with a src attribute pointing to an external JavaScript file, it fetches and executes that file.

Double-clicking on the index.html file in your file explorer triggers the browser to open the file and interpret its HTML, CSS, and JavaScript code. This process allows the browser to render the web page and provide interactivity based on the defined code and external resources.

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• Field: Web Development
• Programme: EITC/WD/JSF JavaScript Fundamentals (go to the certification programme)
• Lesson: Getting started (go to related lesson)
• Topic: Project setup (go to related topic)
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