Use this handy, simplified guide to quickly learn HTML and CSS -- a foundation of modern web development.

But you don’t need to use it, and your sites can still look good without it. How Do CSS and HTML Work Together? If you learned about the web a long time ago, or taught yourself the basics, you may be ...

Just as you would inject an attribute into HTML or CSS code, you can also inject data into JavaScript code. For example, to pass a variable from PHP to JavaScript, inject the value in the ...

By appending just a few lines of HTML and CSS code, researcher Louis Dion-Marcil showed how an external sender could hide the very warning from an email message.