Rich Text Popup (Summary/Details)

HTML

<h1>Only works in Chrome right now I think</h1>

    <details>
        <summary>Click me</summary>
          <div>
              <h2>Hi, I'm Rich HTML!</h2>
              <p>La la la, rich text and stuff</p>
              <img src="http://placekitten.com/100/100">
        </div>
    </details>

<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. Vestibulum tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. Mauris placerat eleifend leo.</p>

CSS

summary {
    background: green;
    padding: 5px 10px;
    color: white; 
    display: inline-block;
    position: relative;
    margin: 0 0 8px 0;
}
 
details div {
     background: red;   
     width: 200px;
     padding: 10px;
}

h2 {
    font: bold 18px Sans-Serif;
    margin: 0 0 8px 0;
}
h1 {
    font: bold 18px Sans-Serif;
    color: red;
    margin: 0 0 8px 0; 
}
p {
    margin: 0 0 8px 0;   
}

JavaScript

/*
    Look ma, no JavaScript
*/