In an effort to promote HTML5 adoption, the W3C has created an HTML5 badge that you can place on your website. A badge is basically an image with supporting HTML code that promotes a specific cause or idea that you can install on your website. You can use this to show the world that your site is coded for HTML5.
Installing badges on a website is a technique that was very common in the early days of the World Wide Web; in the mid- to late 1990s, badges were often used to promote programs such as Internet Explorer 3 and Netscape Navigator 3.1, obscure social causes, cures for diseases, and so on.
Understandably, these badges got so overused and annoying that many website developers dropped them entirely.
Because the nostalgists ...