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HTML

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Apple Liquid Glass HTML Editor</title>
    <style>
        /* Global Styles & iOS-inspired Typography */
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
            margin: 0;
            padding: 0;
            background: linear-gradient(to bottom right, #1a1a2e, #16213e, #0f3460); /* Deep, modern dark background */
            color: #e0e0e0;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            overflow: hidden; /* Hide body scrollbar, let editor content handle scrolling */
        }

/* Editor Container - The "Liquid Glass" Element */
        .editor-container {
            display: flex;
            flex-direction: column;
            width: 90vw;
            max-width: 1400px;
            height: 90vh;
            max-height: 900px;
            background: rgba(255, 255, 255, 0.05); /* Very subtle white background for transparency */
            border-radius: 20px;
            box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3); /* Soft shadow for depth */
            border: 1px solid rgba(255, 255, 255, 0.1); /* Subtle white border */
            backdrop-filter: blur(15px); /* The core "liquid glass" blur effect */
            -webkit-backdrop-filter: blur(15px); /* Safari support */
            overflow: hidden; /* Ensures rounded corners are respected for children */
        }

/* Editor Header */
        .editor-header {
            padding: 15px 25px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: #f0f0f0;
            font-weight: 600;
            font-size: 1.1em;
            letter-spacing: 0.5px;
            background: rgba(255, 255, 255, 0.03); /* Slightly lighter glass for header */
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
        }

.editor-header span {
            color: #88c0d0; /* A subtle accent color for the concept text */
        }

/* Editor Panels Layout */
        .editor-panels {
            display: flex;
            flex-grow: 1; /* Take remaining vertical space */
            padding: 15px;
            gap: 15px; /* Space between code and preview panels */
        }

.editor-panel {
            flex: 1; /* Each panel takes equal width */
            display: flex;
            flex-direction: column;
            background: rgba(0, 0, 0, 0.2); /* Slightly darker glass for individual panels */
            border-radius: 15px;
            border: 1px solid rgba(255, 255, 255, 0.08);
            overflow: hidden; /* For scrollable content inside */
        }

.panel-header {
            padding: 10px 15px;
            font-size: 0.9em;
            color: #b0b0b0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            background: rgba(255, 255, 255, 0.02);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            font-weight: 500;
        }

/* Textarea for Code Input */
        textarea {
            flex-grow: 1; /* Takes all available space in its panel */
            width: 100%;
            padding: 15px;
            background: transparent; /* Transparent to show panel background */
            border: none;
            color: #e0e0e0; /* Light text for code */
            font-family: 'SF Mono', 'Monaco', 'Consolas', 'Liberation Mono', 'Courier New', monospace; /* Monospace for code */
            font-size: 0.95em;
            resize: none; /* Disable manual resize handle */
            outline: none; /* Remove focus outline */
            line-height: 1.5;
            -webkit-overflow-scrolling: touch; /* Smooth scrolling on iOS */
            spellcheck: false; /* Disable spell check for code */
            autocapitalize: off;
            autocomplete: off;
            autocorrect: off;
        }

/* Custom Scrollbar for WebKit browsers (iOS/Safari/Chrome) */
        textarea::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }

textarea::-webkit-scrollbar-track {
            background: rgba(255, 255, 255, 0.05);
            border-radius: 10px;
        }

textarea::-webkit-scrollbar-thumb {
            background-color: rgba(255, 255, 255, 0.2);
            border-radius: 10px;
            border: 2px solid transparent; /* Creates padding around the thumb */
            background-clip: content-box; /* Ensures border doesn't cover thumb */
        }

textarea::-webkit-scrollbar-thumb:hover {
            background-color: rgba(255, 255, 255, 0.3);
        }

/* Live Preview Output Area */
        .preview-output {
            flex-grow: 1;
            background: #ffffff; /* Standard white background for web content preview */
            border-bottom-left-radius: 15px;
            border-bottom-right-radius: 15px;
            overflow: auto; /* Enable scrolling for preview content */
            color: #333; /* Default text color for preview */
            padding: 15px; /* Add padding to preview content */
        }

/* Action Buttons */
        .action-buttons {
            display: flex;
            gap: 10px;
        }

.btn {
            background: rgba(255, 255, 255, 0.1);
            border: 1px solid rgba(255, 255, 255, 0.2);
            color: #f0f0f0;
            padding: 8px 15px;
            border-radius: 10px;
            cursor: pointer;
            font-size: 0.9em;
            transition: background 0.3s ease, border-color 0.3s ease;
            backdrop-filter: blur(5px); /* Subtle glass effect for buttons */
            -webkit-backdrop-filter: blur(5px);
        }

.btn:hover {
            background: rgba(255, 255, 255, 0.2);
            border-color: rgba(255, 255, 255, 0.3);
        }

.btn-primary {
            background: #007aff; /* Apple's signature blue */
            border-color: #007aff;
            color: #fff;
        }

.btn-primary:hover {
            background: #005bb5;
            border-color: #005bb5;
        }
    </style>
</head>
<body>
    <div class="editor-container">
        <div class="editor-header">
            <span>HTML Editor <span style="font-weight: 400; opacity: 0.7;">(iOS 26 Concept)</span></span>
            <div class="action-buttons">
                <button class="btn">Save</button>
                <button class="btn btn-primary" onclick="updatePreview()">Run Code</button>
            </div>
        </div>
        <div class="editor-panels">
            <div class="editor-panel">
                <div class="panel-header">HTML Code</div>
                <input id="htmlCode" spellcheck="false" autocapitalize="off" autocomplete="off" autocorrect="off"
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>My Awesome Page</title>
    <style>
        body { 
            font-family: -apple-system, sans-serif; 
            background-color: #f8f8f8; 
            color: #333; 
            padding: 20px; 
            line-height: 1.6;
        }
        h1 { 
            color: #007aff; /* Apple Blue */
            font-size: 2.2em;
            margin-bottom: 10px;
        }
        p { 
            margin-bottom: 15px; 
            color: #555;
        }
        .card { 
            background: white; 
            padding: 25px; 
            border-radius: 12px; 
            box-shadow: 0 5px 20px rgba(0,0,0,0.1); 
            margin-top: 20px; 
            border: 1px solid #eee;
        }
        .button {
            display: inline-block;
            background-color: #007aff;
            color: white;
            padding: 10px 20px;
            border-radius: 8px;
            text-decoration: none;
            font-weight: 600;
            transition: background-color 0.3s ease;
        }
        .button:hover {
            background-color: #005bb5;
        }
    </style>
</head>
<body>
    <div class="card">
        <h1>Welcome to iOS 26 Web Design!</h1>
        <p>This is a live preview demonstrating a clean, modern, and fluid aesthetic, inspired by Apple's latest UI principles.</p>
        <p>The 'liquid glass' effect is achieved using CSS <code>backdrop-filter</code> on the editor panels.</p>
        <a href="#" class="button">Learn More</a>
    </div>
</body>
</html>/>
            </div>
            <div class="editor-panel">
                <div class="panel-header">Live Preview</div>
                <div class="preview-output" id="livePreview">
                    
                    <h1>Welcome to iOS 26 Web Design!</h1>
                    <p>This is a live preview demonstrating a clean, modern, and fluid aesthetic, inspired by Apple's latest UI principles.</p>
                    <p>The 'liquid glass' effect is achieved using CSS <code>backdrop-filter</code> on the editor panels.</p>
                    <a href="#" class="button">Learn More</a>
                </div>
            </div>
        </div>
    </div>

function updatePreview() {
            // WARNING: Directly injecting user-provided HTML into innerHTML is a security risk (XSS).
            // For a real-world HTML editor, you should render the preview inside an sandboxed iframe
            // using `iframe.srcdoc` for security and isolation.
            livePreviewDiv.innerHTML = htmlCodeTextarea.value;
        }

// Initial update of the preview when the page loads
        updatePreview();

// Update the preview automatically as the user types
        htmlCodeTextarea.addEventListener('input', updatePreview);
    </script>
</body>
</html>

CSS