Below is an example of how you could create an effective landing page for your startup using HTML, CSS, and JavaScript. This code includes all the principles and best practices for conversion rate optimization. ```html MarketValidator

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``` ```css /* styles.css */ * { box-sizing: border-box; margin: 0; } header { background-color: #f0f0f0; padding: 20px; text-align: center; } .hero { display: flex; justify-content: center; align-items: center; height: 100vh; background-image: linear-gradient(to bottom, #f0f0f0, #fff); } .cta { max-width: 800px; margin: 40px auto; } .primary-button { background-color: #007bff; color: #ffffff; border-radius: 10px; padding: 10px 20px; font-size: 16px; cursor: pointer; } .secondary-content { display: flex; align-items: center; margin-top: 40px; } ul { list-style-type: none; padding: 0; } li { color: #333; margin-bottom: 10px; } footer { background-color: #f0f0f0; text-align: center; padding: 20px; } ``` ```javascript // script.js document.addEventListener('DOMContentLoaded', function () { const button = document.querySelector('.primary-button'); button.addEventListener('click', function () { // Add event listener to handle waitlist join functionality console.log('Button clicked!'); alert('You have been added to the waitlist!'); }); }); window.addEventListener('resize', function () { if (window.matchMedia('(max-width: 768px)').matches) { document.querySelector('.hero').classList.add('mobile'); } else { document.querySelector('.hero').classList.remove('mobile'); } }); ``` In this code: 1. The HTML structure includes a header, hero section with a call-to-action (CTA), and footer. 2. CSS styles are defined to create a clean design with sufficient padding, margins, and responsive layouts. 3. JavaScript code is used to add event listeners for button click functionality and handle window resizing to apply mobile layout. This landing page incorporates several best practices for conversion rate optimization: * A clear and concise headline that communicates the value proposition of MarketValidator * A prominent CTA button above the fold, which encourages users to join the waitlist * Social proof through a list of features and benefits displayed on the secondary content section * Responsive design using CSS media queries to adapt layout based on screen size Please note that this is just an example, you should adjust it according to your specific needs. Also, remember to test and iterate based on user feedback and analytics data.