The Coding Journey

Write HTML, CSS, and JavaScript in real-time and preview the results in a sandboxed iframe.

HTML
CSS
JavaScript

What is The Coding Journey?

The Coding Journey (Code Playground) is a client-side web development sandbox designed for writing, rendering, and testing frontend code. With text editors for HTML, CSS, and JavaScript alongside a live iframe preview, developers and students can experiment with styles and script logic directly in their browser.

This playground compiles and runs all code blocks locally in a sandboxed iframe. Because no inputs, custom styles, or script parameters are sent to external databases, your code ideas and interface designs remain private.

How to Use The Coding Journey

  1. Choose a Preset: Click "Basic Template" or "Button Template" to load starter HTML, CSS, and JavaScript templates.
  2. Edit HTML Structure: Enter your HTML elements (like headings, containers, or links) into the HTML panel.
  3. Write Styling Rules: Enter CSS selectors, variables, and layouts in the CSS panel to style your elements.
  4. Add Script Logic: Type your JavaScript functions and event handlers in the JavaScript panel to make the interface interactive.
  5. Inspect the Preview: Review the sandboxed iframe panel on the right to see your combined code render instantly.
  6. Export Your Project: Click "Export HTML" to download your combined work as a single, ready-to-run HTML file.

Key Features

Common Use Cases

Frequently Asked Questions

No. 99tool.in compiles and renders your HTML, CSS, and JavaScript code locally in your browser. None of your codes are stored on our servers.

Your editor code is cached in your browser's LocalStorage. If you refresh the page or return later, your code blocks will reload automatically.

Yes. The "Export HTML" option compiles your styling into a <style> block and your script into a <script> block inside a single file.

To inspect your JavaScript console outputs, open your browser's Developer Tools (usually by pressing F12 or right-clicking and selecting "Inspect") and go to the Console tab.

🔒 Privacy & Data Note: Code rendering, iframe sandboxing, and HTML exports occur locally in your browser. No files are uploaded to our servers.

${html} `; preview.srcdoc = output; // Save progress localStorage.setItem('99tool_playground_save', JSON.stringify({html, css, js})); } function loadTemplate(type) { if (type === 'basic') { htmlEditor.value = `

The Coding Journey

\n

Start your adventure here.

`; cssEditor.value = `body { font-family: sans-serif; padding: 40px; text-align: center; background: #fafafa; }\nh1 { color: #e53935; }`; jsEditor.value = `console.log("Ready to code?");`; } else if (type === 'button') { htmlEditor.value = ``; cssEditor.value = `.cool-btn { padding: 15px 30px; border: 2px solid #e53935; background: none; color: #e53935; border-radius: 30px; font-weight: bold; cursor: pointer; transition: 0.3s; }\n.cool-btn:hover { background: #e53935; color: white; }`; jsEditor.value = ``; } updatePreview(); } function exportFile() { const output = ` ${htmlEditor.value} `; const blob = new Blob([output], {type: 'text/html'}); const url = URL.createObjectURL(blob); const a = document.createElement('a'); a.href = url; a.download = 'playground_export.html'; a.click(); } // Restore save const saved = JSON.parse(localStorage.getItem('99tool_playground_save')); if (saved) { htmlEditor.value = saved.html; cssEditor.value = saved.css; jsEditor.value = saved.js; updatePreview(); } else { loadTemplate('basic'); }