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Top 50 JavaScript Interview Questions & Answers (Beginner to Advanced) Whether you're preparing for a web development job or improving your JS skills, these 50 JavaScript interview questions will help you master the important concepts. 1. What is JavaScript? JavaScript is a high-level programming language used to make web pages interactive. 2. How do you print output in JavaScript? Copy Run document.write("Hello World!"); console.log("Printed successfully"); 3. What are variables? Variables store data. JS has var , let , and const . Copy Run let name = "Alex"; const age = 21; document.write(name + " - " + age); 4. Difference between let and var? var → function scoped let → block scoped (recommended) 5. What are data types in JavaScript? String Number Boolean Undefined Null Object Array 6. What is typeof? Copy Run ...
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What is JavaScript? Complete Beginner Guide with Examples JavaScript (JS) is a programming language that makes websites dynamic and interactive . While HTML creates structure and CSS makes it beautiful, JavaScript adds life and functionality . HTML → Structure CSS → Design JavaScript → Behavior & Logic How to Add JavaScript in HTML 1️⃣ Inline JavaScript Copy Run document.write("<h2>Hello from Inline JavaScript!</h2>"); 2️⃣ Internal JavaScript Copy Run document.write(` <script> document.write("<h3>Internal JS Running</h3>"); </script> `); 3️⃣ External JavaScript (Best) ```html <script src="script.js"></script> ```` JavaScript Statements Everything in JS is executed as a statement: Copy Run document.write("Hello JavaScript!"); console.log("Code executed"); Variables in JavaScript JS has 3 ma...
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What is CSS? Full Beginner Guide With All Important Concepts CSS stands for Cascading Style Sheets . While HTML provides structure to a webpage, CSS controls how the webpage looks — colors, layouts, fonts, backgrounds, spacing, and much more. HTML = Structure CSS = Design & Layout How to Use CSS in HTML There are 3 ways to include CSS in a webpage: 1. Inline CSS Copy Run <h1 style="color:blue;">Hello World!</h1> 2. Internal CSS Copy Run <style> h1 { color: blue; } </style> 3. External CSS (Best Method) Copy Run <link rel="stylesheet" href="style.css"> CSS Syntax Copy selector { property: value; } Example: Copy Run p { color: red; } CSS Selectors 1. Element Selector Copy Run p { color: blue; } 2. Class Selector Copy Run .myText { color: red; } 3. ...
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Create a Complete HTML Video Player with CSS (Step-by-Step) The default HTML <video> player works well, but sometimes you want a custom player with your own design. In this tutorial, we will build a modern video player using HTML, CSS, and a little JavaScript. 💡 Features of This Video Player Custom Play & Pause button Progress bar showing playback position Time display Modern clean UI No external libraries 📌 Step 1: HTML Structure First, create the HTML layout for the player. <div class="video-container"> <video id="video" src="video.mp4"></video> <div class="controls"> <button id="playBtn">Play</button> <div class="progress"> <div id="progressBar"></div> </div> <span id="time">00:00 / 00:00</span> </div> </div> 🎨 Step 2: CSS Styling Add the foll...
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All Methods to Play Video in HTML (With Examples) HTML provides many ways to play video on a webpage, from simple inline videos to YouTube embeds, autoplay, fullscreen mode, and more. In this post, we will explore every commonly used technique to play videos in HTML with clean code examples. 1. Basic Video Playback This is the simplest way to display a video on a web page. <video src="video.mp4" controls></video> Important: The controls attribute lets users play/pause the video. 2. Video with Width and Height <video src="video.mp4" width="640" height="360" controls></video> 3. Using <source> Tag for Multiple Formats This ensures the browser chooses the best supported format. <video controls> <source src="video.mp4" type="video/mp4"> <source src="video.webm" type="video/webm"> Your browser does not support HTML5 video. </vid...
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All Important HTML Tags with Examples (Beginner Guide) HTML has more than 100 tags, but only a few are used in regular web development. This post explains the most commonly used HTML tags, along with simple examples, so beginners can quickly understand how they work. 1. <!DOCTYPE> Declares the document type as HTML5. <!DOCTYPE html> 2. <html> Main container of the entire webpage. <html> ... </html> 3. <head> Contains information for the browser, not visible to users. 4. <title> Defines the page title shown in browser tab. <title>My Website</title> 5. <body> Contains all visible content on the webpage. Text Formatting Tags 6. <h1> to <h6> Headings from largest (h1) to smallest (h6). <h1>Main Heading</h1> <h2>Sub Heading</h2> 7. <p> Defines a paragraph. 8. <br> Line break. 9. <b> and <strong> Bold text. <strong> is more SE...
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HTML Page Structure Explained (Beginner Friendly) In the previous lesson, we learned what HTML is. Now let’s understand how an HTML page is structured. Every webpage follows a basic structure made of important HTML tags. HTML structure = Skeleton of a webpage. Basic HTML Page Structure Here is the simplest form of a complete HTML page: <!DOCTYPE html> <html> <head> <title>My First Webpage</title> </head> <body> <h1>Hello World!</h1> <p>Welcome to my webpage.</p> </body> </html> Let’s understand each part 1. <!DOCTYPE html> This tells the browser that the document is an HTML5 webpage. It is always written at the top. 2. <html> ... </html> This is the root tag. Everything inside the webpage is written between these tags. 3. <head> ... </head> The head section contains information about the webpage such as: Page title SEO meta tags CSS fil...
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