HTML Code Challenges & Tips

1. Create a responsive navigation menu using only HTML and CSS. The menu should collapse into a hamburger icon on smaller screens.

2. Write an HTML structure for a simple webpage that includes a header, footer, main content area, and a sidebar.

3. Build a form using HTML that collects user information (name, email, password) and includes validation for each field.

4. Create a table using HTML to display a list of users with columns for ID, Name, Email, and Registration Date.

5. Write an HTML document that includes an image gallery using the `<figure>` and `<figcaption>` elements, with at least 4 images.

6. Construct an HTML structure for a blog post that includes a title, author, publication date, content, and comments section.

7. Create a responsive grid layout using the HTML `<div>` elements and CSS Grid or Flexbox, displaying items in a 3-column format.

8. Write an HTML snippet that defines an accessible navigation dropdown menu, ensuring it is usable with a keyboard.

9. Develop a simple HTML5 audio player that allows users to play, pause, and adjust the volume of an audio file.

10. Build a modal dialog using only HTML and CSS, which can be triggered by clicking a button, without using JavaScript.