Exemplo de tela de carregamento animada em HTML com CSS

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>CSS Animated Loading Screen</title>
    <style>
        /* Basic Body Styling */
        body {
            margin: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f0f2f5;
            color: #333;
            overflow-x: hidden; /* Prevent horizontal scroll */
        }

/* Loading Screen Styles */
        #loading-screen {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: #ffffff; /* Clean white background */
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 9999; /* Ensure it's on top of everything */
            opacity: 1;
            transition: opacity 0.7s ease-out, visibility 0.7s ease-out; /* Smooth fade out transition */
            visibility: visible; /* Initially visible */
        }

#loading-screen.fade-out {
            opacity: 0;
            visibility: hidden; /* Hide the element after fade */
            pointer-events: none; /* Prevent interaction with the invisible element */
        }

/* Spinner Animation */
        .spinner {
            border: 6px solid rgba(0, 0, 0, 0.1); /* Light grey border */
            border-top: 6px solid #4CAF50; /* Green top border for color */
            border-radius: 50%;
            width: 50px;
            height: 50px;
            animation: spin 1.2s linear infinite; /* Spin animation */
        }

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

/* Content Area Styles */
        .content {
            padding: 40px 20px;
            text-align: center;
            opacity: 0; /* Initially hidden */
            transform: translateY(20px); /* Slightly move down for a subtle entrance */
            transition: opacity 1s ease-in, transform 1s ease-in; /* Fade in and slide up transition */
        }

.content.show {
            opacity: 1;
            transform: translateY(0);
        }

.content h1 {
            color: #34495e;
            margin-bottom: 15px;
        }

.content p {
            line-height: 1.6;
            max-width: 700px;
            margin: 0 auto 30px;
        }

.content img {
            max-width: 100%;
            height: auto;
            border-radius: 8px;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
    </style>
</head>
<body>

<div id="loading-screen">
        <div class="spinner"></div>
    </div>

<div class="content">
        <h1>Welcome to Your HTML Editor!</h1>
        <p>This is where your amazing web content will appear. The loading screen provides a smooth and professional transition for your users, enhancing the perceived performance of your application.</p>
        <p>You can customize the spinner, background, and animation to match your brand's aesthetics.</p>
        <img src="https://via.placeholder.com/800x400/5cb85c/ffffff?text=Your+Editor+Interface+Here" alt="Placeholder for Editor Interface">
    </div>

// Simulate a network/resource loading delay.
            // In a real application, you might hide the loader
            // after actual data fetching or resource loading is complete.
            setTimeout(() => {
                // Add the 'fade-out' class to trigger the CSS transition
                loadingScreen.classList.add('fade-out');

// After the loading screen starts fading, reveal the content
                // A slight delay here ensures the loading screen starts fading
                // before the content becomes fully visible.
                setTimeout(() => {
                    mainContent.classList.add('show');
                }, 300); // Adjust this delay to synchronize with loading screen fade-out

// Optional: Remove the loading screen from the DOM
                // once its transition is fully complete to clean up the DOM.
                loadingScreen.addEventListener('transitionend', () => {
                    if (loadingScreen.classList.contains('fade-out')) {
                        loadingScreen.remove();
                    }
                }, { once: true }); // The listener will only fire once
            }, 1800); // Adjust this time to simulate longer/shorter loading times
        });
    </script>

</body>
</html>

Exemplo de tela de carregamento animada em HTML com CSS

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