Make sure when making a fetch request to get the full html code of the website url it should always and only accept response in ' text/html ' content type. After this parse it then extract the required data and store the extracted data as JSON in indexdb to use it in the session. don't damge any data iin any process. Send the fully working full code. --- <!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Monochrome Light Novel Collection</title>

    <!-- Preconnect and Load Fonts Efficiently -->
    <link rel="preconnect" href="https://fonts.googleapis.com" crossorigin>
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap" rel="stylesheet">

    <!-- External Libraries Without `defer` to Ensure Execution Order -->
    <script src="https://cdn.jsdelivr.net/npm/dexie@3.2.2/dist/dexie.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/intersection-observer@0.12.2/intersection-observer.min.js"></script>
    <!-- AOS Library for Scroll Animations -->
    <link href="https://cdn.jsdelivr.net/npm/aos@2.3.4/dist/aos.css" rel="stylesheet">
    
    <!-- Stylesheet -->
    <style>
        /* Root Variables */
        :root {
            --primary-color: #000000;
            --secondary-color: #ffffff;
            --background-color: #f5f5f5;
            --card-background: #ffffff;
            --text-primary: #000000;
            --text-secondary: #666666;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
            --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
            --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
            --radius-sm: 0.375rem;
            --radius-md: 0.5rem;
            --radius-lg: 1rem;
            --transition-duration: 0.3s;
            --max-width: 1280px;
            --header-height: 80px; /* Define header height for layout adjustments */
        }

        /* Reset and Base Styles */
        *, *::before, *::after {
            box-sizing: border-box;
        }

        body {
            margin: 0;
            font-family: 'Inter', sans-serif;
            background-color: var(--background-color);
            color: var(--text-primary);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* Main Content Styles */
        .main {
            flex: 1;
            max-width: var(--max-width);
            margin: 2rem auto;
            padding: 0 1rem;
        }

        /* Search Styles */
        .search-container {
            margin-bottom: 2rem;
            display: flex;
            justify-content: center;
        }

        .search-input {
            width: 100%;
            max-width: 600px;
            padding: 0.75rem 1.5rem;
            font-size: 1rem;
            border: 2px solid var(--primary-color);
            border-radius: var(--radius-md);
            outline: none;
            transition: border-color var(--transition-duration) ease;
            background-color: var(--secondary-color);
            color: var(--text-primary);
        }

        .search-input:focus {
            border-color: var(--text-secondary);
        }

        /* Grid Styles */
        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            gap: 2rem;
        }

        /* Card Styles */
        .card {
            background: var(--card-background);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: transform var(--transition-duration) ease, box-shadow var(--transition-duration) ease;
            cursor: pointer;
            display: flex;
            flex-direction: column;
            height: 100%;
            opacity: 0; /* For AOS animation */
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-lg);
        }

        .card__image-container {
            position: relative;
            width: 100%;
            padding-top: 140%; /* 5:7 aspect ratio */
            background: #e0e0e0;
            overflow: hidden;
        }

        .card__image {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: opacity var(--transition-duration) ease;
            opacity: 0;
        }

        .card__image.loaded {
            opacity: 1;
        }

        .card__content {
            padding: 1rem;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .card__title {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-primary);
            text-align: center;
            overflow: hidden;
            text-overflow: ellipsis;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
        }

        /* Loader Styles */
        .loader {
            display: none; /* Initially hidden */
            justify-content: center;
            align-items: center;
            height: 200px;
            color: var(--text-secondary);
        }

        .loader.visible {
            display: flex; /* Show when visible */
        }

        .loader__spinner {
            width: 50px;
            height: 50px;
            border: 5px solid #f3f3f3;
            border-top: 5px solid var(--primary-color);
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        /* Error Message Styles */
        .error-message {
            text-align: center;
            color: #ff0000;
            padding: 1rem;
            background: #ffe6e6;
            border-radius: var(--radius-sm);
            margin: 1rem 0;
        }

        /* Modal Styles */
        .modal {
            display: none;
            position: fixed;
            z-index: 2000;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0,0,0,0.7);
            justify-content: center;
            align-items: center;
            padding: 1rem;
        }

        .modal-content {
            background-color: var(--secondary-color);
            padding: 2rem;
            border-radius: var(--radius-lg);
            max-width: 700px;
            width: 100%;
            position: relative;
            box-shadow: var(--shadow-lg);
            animation: fadeIn 0.3s ease;
        }

        .close {
            position: absolute;
            top: 1rem;
            right: 1.5rem;
            color: var(--text-secondary);
            font-size: 2rem;
            font-weight: bold;
            cursor: pointer;
            transition: color var(--transition-duration) ease;
            background: none;
            border: none;
            font-family: inherit;
        }

        .close:hover,
        .close:focus {
            color: var(--text-primary);
        }

        .modal__title {
            font-size: 1.75rem;
            font-weight: 700;
            margin-bottom: 1rem;
            color: var(--text-primary);
        }

        .modal__link {
            display: inline-block;
            padding: 0.75rem 1.5rem;
            background-color: var(--primary-color);
            color: var(--secondary-color);
            text-decoration: none;
            border-radius: var(--radius-md);
            font-weight: 600;
            transition: background-color var(--transition-duration) ease;
        }

        .modal__link:hover {
            background-color: var(--text-secondary);
        }

        /* Sentinel Element for Infinite Scroll */
        .sentinel {
            height: 1px;
        }

        /* Animations */
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        /* Responsive Styles */
        @media (max-width: 768px) {
            .grid {
                grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
                gap: 1.5rem;
            }

            .card__title {
                font-size: 1rem;
            }
        }

        @media (max-width: 480px) {
            .grid {
                grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
                gap: 1rem;
            }
        }
    </style>
</head>
<body>
    <!-- Main Content -->
    <main class="main" role="main">
        <!-- Search Bar -->
        <div class="search-container">
            <input type="text" id="search-input" class="search-input" placeholder="Search light novels..." aria-label="Search light novels">
        </div>

        <!-- Content Grid -->
        <div id="content" class="grid" aria-live="polite">
            <!-- Initial Loader -->
            <div class="loader" id="loader" role="status" aria-label="Loading novels">
                <div class="loader__spinner"></div>
            </div>
        </div>

        <!-- Sentinel Element for Infinite Scroll -->
        <div class="sentinel" id="sentinel"></div>
    </main>

    <!-- Modal -->
    <div id="modal" class="modal" aria-hidden="true" role="dialog" aria-labelledby="modal-title">
        <div class="modal-content">
            <button class="close" aria-label="Close modal">&times;</button>
            <h2 id="modal-title" class="modal__title"></h2>
            <a id="modal-link" class="modal__link" href="#" target="_blank" rel="noopener noreferrer">Read PDF</a>
        </div>
    </div>

    <!-- AOS Library for Animations -->
    <script src="https://cdn.jsdelivr.net/npm/aos@2.3.4/dist/aos.js"></script>

    <!-- JavaScript -->
    <script>
        'use strict';
        (() => {
            // Initialize Dexie Database with Unique Constraint on pdfUrl to Prevent Duplicates
            const db = new Dexie('MonochromeNovelsDB');
            db.version(1).stores({
                novels: '++id, name, coverUrl, &pdfUrl, timestamp'
            });

            // Constants
            const PAGE_SIZE = 20; // Number of novels to load per page
            let currentPage = 0; // Current page index
            let isLoading = false; // Flag to prevent multiple simultaneous loads
            let hasMore = true; // Flag to determine if more novels are available
            let currentSearchTerm = ''; // Current search term

            const PLACEHOLDER_IMAGE = 'https://via.placeholder.com/500x700?text=No+Image'; // Placeholder for missing images

            // In-memory Cache for Image Loading to Prevent Duplicate Loads
            const imageLoadingPromises = new Map();

            // Debounce Function to Limit Function Execution Rate
            const debounce = (func, delay) => {
                let debounceTimer;
                return function(...args) {
                    const context = this;
                    clearTimeout(debounceTimer);
                    debounceTimer = setTimeout(() => func.apply(context, args), delay);
                }
            };

            // Utility: Delay Function
            const delay = ms => new Promise(resolve => setTimeout(resolve, ms));

            // Utility: Retry Operation with Exponential Backoff (2 Attempts)
            const retryOperation = async (operation, attempts = 2, delayDuration = 1500) => {
                for (let i = 0; i < attempts; i++) {
                    try {
                        return await operation();
                    } catch (error) {
                        if (i === attempts - 1) throw error;
                        await delay(delayDuration * (i + 1)); // Exponential backoff
                    }
                }
            };

            // Initialize Intersection Observer for Infinite Scroll using Sentinel Element
            const setupSentinelObserver = () => {
                const sentinel = document.getElementById('sentinel');
                const sentinelObserver = new IntersectionObserver((entries) => {
                    entries.forEach(entry => {
                        if (entry.isIntersecting && hasMore && !isLoading) {
                            loadNextPage();
                        }
                    });
                }, {
                    rootMargin: '100px',
                    threshold: 0
                });
                sentinelObserver.observe(sentinel);
            };

            // Load Next Page of Novels from IndexedDB
            const loadNextPage = async () => {
                isLoading = true;
                showLoader();

                try {
                    let novels;

                    if (currentSearchTerm === '') {
                        novels = await db.novels
                            .orderBy('id') // Order by id to maintain extraction order
                            .offset(currentPage * PAGE_SIZE)
                            .limit(PAGE_SIZE)
                            .toArray();
                    } else {
                        novels = await db.novels
                            .where('name')
                            .startsWithIgnoreCase(currentSearchTerm)
                            .offset(currentPage * PAGE_SIZE)
                            .limit(PAGE_SIZE)
                            .toArray();
                    }

                    if (novels.length < PAGE_SIZE) {
                        hasMore = false; // No more novels to load
                    }

                    if (novels.length > 0) {
                        appendNovelsToDisplay(novels);
                        currentPage++;
                    }
                } catch (error) {
                    console.error('Error loading novels:', error);
                    showError('An error occurred while loading novels.');
                } finally {
                    hideLoader();
                    isLoading = false;
                }
            };

            // Show Loader
            const showLoader = () => {
                const loader = document.getElementById('loader');
                if (loader) loader.classList.add('visible');
            };

            // Hide Loader
            const hideLoader = () => {
                const loader = document.getElementById('loader');
                if (loader) loader.classList.remove('visible');
            };

            // Display Error Message
            const showError = message => {
                const content = document.getElementById('content');
                const errorDiv = document.createElement('div');
                errorDiv.className = 'error-message';
                errorDiv.setAttribute('role', 'alert');
                errorDiv.textContent = message;
                content.appendChild(errorDiv);
                hideLoader();
            };

            // Append Novels to Display
            const appendNovelsToDisplay = novels => {
                const content = document.getElementById('content');
                const fragment = document.createDocumentFragment();

                novels.forEach(novel => {
                    const card = createNovelCard(novel);
                    fragment.appendChild(card);
                });

                content.appendChild(fragment);
                AOS.refresh(); // Refresh AOS to apply animations to new elements
                setupImageObserver(); // Initialize lazy loading for new images
            };

            // Create Novel Card Element
            const createNovelCard = novel => {
                const card = document.createElement('div');
                card.className = 'card';
                card.setAttribute('tabindex', '0');
                card.setAttribute('role', 'button');
                card.setAttribute('aria-labelledby', `novel-title-${novel.id}`);
                card.setAttribute('data-aos', 'fade-up'); // AOS attribute for animation

                // Construct HTML Structure: Image on top, title below
                card.innerHTML = `
                    <div class="card__image-container">
                        <img 
                            class="card__image lazy" 
                            data-src="${novel.coverUrl}" 
                            alt="Cover of ${novel.name}"
                            loading="lazy"
                        />
                    </div>
                    <div class="card__content">
                        <h2 id="novel-title-${novel.id}" class="card__title">${novel.name}</h2>
                    </div>
                `;

                // Event Listener to Open Modal
                card.addEventListener('click', () => {
                    showModal(novel);
                });

                // Keyboard Accessibility: Open Modal on Enter or Space Key
                card.addEventListener('keydown', event => {
                    if (event.key === 'Enter' || event.key === ' ') {
                        event.preventDefault();
                        showModal(novel);
                    }
                });

                return card;
            };

            // Initialize Image Observer for Lazy Loading Images
            let imageObserver;
            const setupImageObserver = () => {
                if (imageObserver) return; // Prevent multiple observers

                imageObserver = new IntersectionObserver((entries, observer) => {
                    entries.forEach(entry => {
                        if (entry.isIntersecting) {
                            const img = entry.target;
                            loadImage(img).then(() => observer.unobserve(img));
                        }
                    });
                }, {
                    rootMargin: '50px 0px',
                    threshold: 0.1
                });

                const lazyImages = document.querySelectorAll('.card__image.lazy');
                lazyImages.forEach(img => {
                    imageObserver.observe(img);
                });
            };

            // Load Image and Handle Fallback
            const loadImage = async img => {
                const src = img.dataset.src;
                if (!src) return;

                if (!imageLoadingPromises.has(src)) {
                    const promise = retryOperation(async () => {
                        return new Promise((resolve, reject) => {
                            const tempImage = new Image();
                            tempImage.onload = () => {
                                img.src = src;
                                img.classList.add('loaded');
                                resolve();
                            };
                            tempImage.onerror = () => {
                                img.src = PLACEHOLDER_IMAGE;
                                img.classList.add('loaded'); // Still resolve to remove loading state
                                resolve();
                            };
                            tempImage.src = src;
                        });
                    }).finally(() => imageLoadingPromises.delete(src));

                    imageLoadingPromises.set(src, promise);
                }

                return imageLoadingPromises.get(src);
            };

            // Modal Functionality
            const modal = document.getElementById('modal');
            const modalTitle = document.getElementById('modal-title');
            const modalLink = document.getElementById('modal-link');
            const closeBtn = document.querySelector('.close');

            const showModal = novel => {
                modalTitle.textContent = novel.name;
                modalLink.href = novel.pdfUrl;
                modal.style.display = 'flex';
                modal.setAttribute('aria-hidden', 'false');
                document.body.style.overflow = 'hidden'; // Prevent background scrolling
                closeBtn.focus(); // Focus on close button for accessibility
            };

            const closeModal = () => {
                modal.style.display = 'none';
                modal.setAttribute('aria-hidden', 'true');
                document.body.style.overflow = 'auto';
            };

            closeBtn.addEventListener('click', closeModal);

            window.addEventListener('click', event => {
                if (event.target === modal) {
                    closeModal();
                }
            });

            window.addEventListener('keydown', event => {
                if (event.key === 'Escape' && modal.style.display === 'flex') {
                    closeModal();
                }
            });

            // Search Functionality
            const searchInput = document.getElementById('search-input');

            const handleSearch = debounce(async () => {
                currentSearchTerm = searchInput.value.trim();
                currentPage = 0;
                hasMore = true;

                const content = document.getElementById('content');
                content.innerHTML = ''; // Clear existing content

                // Reload the first page with the new search term
                await loadNextPage();
            }, 300); // 300ms debounce delay

            searchInput.addEventListener('input', handleSearch);

            // Initialize Application
            const initializeApp = async () => {
                try {
                    // Check if any novels are already stored in IndexedDB
                    const count = await db.novels.count();
                    if (count === 0) {
                        // If not, fetch from the target website
                        const html = await retryOperation(() => fetchHTML('https://jnovels.com/top-light-novels-to-read/'));
                        const novels = parseHTML(html);

                        if (novels.length === 0) {
                            showError('No novels found on the target page.');
                            return;
                        }

                        // Bulk add novels to IndexedDB (duplicates will be skipped due to unique constraint)
                        await db.novels.bulkAdd(novels);
                    }

                    // Load the first page of novels
                    await loadNextPage();
                } catch (error) {
                    console.error('Error initializing application:', error.message || error);
                    showError('Failed to load novels. Please try refreshing the page.');
                }
            };

            // Fetch HTML Content via Proxy
            const fetchHTML = async url => {
                const response = await fetch(`https://api.allorigins.win/get?url=${encodeURIComponent(url)}`);
                if (!response.ok) throw new Error(`HTTP error! status: ${response.status}`);
                const data = await response.json();
                return data.contents;
            };

            // Parse Fetched HTML to Extract Novel Data in Order
            const parseHTML = html => {
                const parser = new DOMParser();
                const doc = parser.parseFromString(html, 'text/html');
                const novels = [];

                // Select all h3 elements which contain the book name and PDF link
                const h3Elements = doc.querySelectorAll('h3');

                h3Elements.forEach(h3 => {
                    try {
                        // Extract Book Name
                        const nameElement = h3.querySelector('a > span[style="color: #ff6600;"]');
                        const name = nameElement?.textContent.trim();

                        // Extract PDF Link
                        const pdfLink = h3.querySelector('a')?.getAttribute('href').trim();

                        // The next sibling p tag contains the book cover image
                        const p = h3.nextElementSibling;
                        if (p && p.tagName.toLowerCase() === 'p') {
                            const imgElement = p.querySelector('img');
                            let coverUrl = imgElement?.getAttribute('src');

                            // Handle different URL formats
                            if (coverUrl) {
                                if (coverUrl.startsWith('//')) {
                                    coverUrl = `https:${coverUrl}`;
                                } else if (coverUrl.startsWith('/')) {
                                    coverUrl = `https://jnovels.com${coverUrl}`;
                                }
                            }

                            if (coverUrl && coverUrl !== '') {
                                novels.push({
                                    name,
                                    coverUrl,
                                    pdfUrl: pdfLink,
                                    timestamp: Date.now()
                                });
                            }
                        }
                    } catch (error) {
                        // Skip any malformed entries
                        console.error('Error parsing a novel entry:', error);
                    }
                });

                return novels;
            };

            // Initialize AOS and Start the Application once the DOM is fully loaded
            document.addEventListener('DOMContentLoaded', () => {
                // Initialize AOS
                AOS.init({
                    duration: 800,
                    easing: 'ease-in-out',
                    once: true,
                });
                setupSentinelObserver();
                initializeApp();
            });

            // Clear IndexedDB when the user exits (close or refresh)
            window.addEventListener('beforeunload', () => {
                db.delete().catch(() => {
                    // Handle errors silently as there's no way to notify the user
                });
            });
        })();
    </script>
</body>
</html>