Html Programming Tutorials, Guides & Best Practices

In this tutorial, we will walk through how to create a countdown timer using JavaScript. The timer will dynamically display the remaining time (days, hours, minutes, and seconds) until a specified deadline, updating in real-time every second.

To follow this tutorial, you need:

<table>
    <tr>
        <td>Apple</td>
        <td>Banana</td>
        <td>Cherry</td>
        <td><a class="export-btn">Export</a></td>
    </tr>
    <tr>
        <td>Dog</td>
        <td>Cat</td>
        <td>Bird</td>
        <td><a class="export-btn">Export</a></td>
    </tr>
</table>

• Each row (<tr>) contains three data cells (<td>), followed by an "Export" button that will trigger the export action.
• The button has a class of export-btn, which we will use to attach event listeners.

سنقوم الآن بإضافة بعض التفاعلات مثل عرض رسالة بعد إرسال النموذج. سننشئ ملفًا يسمى scripts.js:

document.getElementById('contact-form').addEventListener('submit', function(event) {
    event.preventDefault();
    alert('تم إرسال رسالتك بنجاح!');
});

• Data Attributes: Custom attributes prefixed with data-, e.g., <div data-info="123">.
• Local Storage: Use the localStorage API for client-side data storage.
• Geolocation API: Retrieve geographic location data of the user.
• Drag and Drop: Built-in drag and drop functionality for elements.

This cheat sheet provides a quick overview of the essential components and best practices in HTML5. For further learning, you can refer to detailed documentation on each feature and tag to master HTML5 in-depth.