HTML utilizes <script> tags to link to external JavaScript resources and <link rel="stylesheet"> tags for CSS resources. These file extensions are specifically designed to enhance the appearance of an HTML page within the browser.

JavaScript is responsible for handling the functionalities and behaviors typically associated with the code of a webpage. By interacting with the HTML markup through DOM queries (commonly achieved using methods like document.getElementById() or external libraries such as jQuery), you can manipulate elements on the page. The DOM acts as a representation of the HTML content in the browser environment.

CSS, on the other hand, allows for the styling of HTML elements using selectors to target specific components and apply visual modifications accordingly.

When combined, these three technologies work harmoniously to create a dynamic and visually appealing web experience.

Example:

HTML

<script src="myscript.js"></script>
<link rel="stylesheet" href="mystyles.css">
<div id="bar">
   Welcome!
</div>

JavaScript (myscript.js)

document.getElementById("bar").addEventListener('click', function () {
    alert('You have clicked the div!');
});

CSS (mystyles.css)

#bar {
   color: blue;
}

When a browser loads a webpage, it goes through a series of steps to display the content on the screen.

The HTML parser reads the HTML text and creates a DOM tree structure.

In addition, the browser has a CSS parser that processes styles found in <style> tags or external CSS files. It combines these styles with the HTML DOM tree to form a render tree containing both CSS and HTML information.

The browser then performs the screen layout and renders pixels on the screen based on the render tree.

Furthermore, the browser includes a JavaScript engine that executes any JavaScript code present in script tags or separate JS files after the page has fully loaded.

It is recommended to keep your HTML, CSS, and JS files separate for CSP compliance purposes.

If you need more details on this topic, feel free to ask!

Update

Introduction: The Process of Rendering Pixels to Screen

Each frame, the browser follows specific steps to render the webpage visually on the screen.

https://i.stack.imgur.com/snoQr.jpg

• JavaScript. JavaScript is commonly used for tasks that result in visual changes, such as animations, sorting data, or manipulating DOM elements on the page.

• Style calculations. This step involves determining which CSS rules apply to each element based on selectors and calculating the final styles for each element.

• Layout. The browser calculates the space occupied by each element on the screen and their positions based on the web's layout model.

• Paint. Painting fills in pixels by drawing textual content, colors, images, borders, shadows, and other visual elements onto multiple layers.

• Compositing. Elements drawn into different layers are composed to display correctly on the screen, especially when overlapping occurs.

For more information and sources, visit: https://developers.google.com/web/fundamentals/performance/rendering/?hl=en

When you open a web page in your browser, what you see is a blend of structure (HTML), style (CSS) and interactivity (JavaScript). These tasks are handled by three distinct technologies - HTML, CSS, and JavaScript - which are all understood by your browser.

HTML defines the different types of content structures such as paragraphs, blocks, lists, images, tables, forms, and comments. CSS determines how each type of element should be visually displayed, taking into consideration different media types like screen, print, or handheld devices. JavaScript dictates how the web page should respond to user events, like clicks or changes in form inputs.

Different browsers utilize various rendering engines The default rendering engine can show HTML and XML documents along with images. Additional data formats can be displayed through plug-ins; for instance, displaying PDF files using a PDF viewer plug-in. The rendering engine begins by parsing the HTML document and converting elements into DOM nodes within a tree known as the "content tree". It then processes style information from external CSS files and style elements to create another tree called the render tree, which combines styling and visual instructions provided in the HTML.

To learn more, visit http://www.html5rocks.com/en/tutorials/internals/howbrowserswork/

Let me break it down for you in a simple and concise manner:

HTML is used to include elements like buttons, forms, paragraphs, and divs that hold content, but it doesn't offer many styling options on its own.

CSS is solely dedicated to styling these elements and positioning them on the HTML page. For instance, if you need to adjust the width, height, or color of an element, CSS comes into play.

Javascript is utilized to create interactive features with elements. For example, clicking on a delete button should trigger a confirmation modal for deleting data. Javascript enables interaction with DOM (Document Object Model) elements — essentially the HTML elements on the page — and allows for dynamic changes to their properties.

While HTML is directly written within

There are different ways to apply styles using CSS:

• Inline: This method involves adding the style directly within the HTML tag, like so:

<div style = "width: 100px; height: 100px; background-color: teal">I am a div</div>

• Using an external file

/*This is the css file*/

.customDiv{
    width: 100px;
    height: 100px;
    background-color: teal;
}

<link type = "text/css" rel = "stylesheet" href = "myStyles.css"/>

<div class = "customDiv"> This is a div </div>

Javascript can be included between <script></script> tags in the HTML or by referencing an external JS file using the src attribute

<script type="text/javascript" src="myCustonJS.js"></script>

For instance,

document.getElementById("myDiv").onclick = function (){alert("JS DID THIS!!")};

#myDiv{
    width: 100px;
    height: 100px;
    background-color: teal;
}

<div id = "myDiv">This is a div</div>

The main component of a website is the HTML page. This is what the browser will interpret and display.

Within the HTML, you can include a <script></script> block for JavaScript and/or a <style></style> block for CSS. These blocks inform the browser that everything inside them is either JavaScript or CSS.

While it is common practice to keep JavaScript and CSS files separate by linking to external .js and .css files, it is not strictly necessary. However, this is considered best practice. Even when linking externally, you still use HTML to reference these files using

<script src="someJsFile.js"></script>

<link rel="stylesheet" href="someCssFile.css">