How to Check for Null in PHP

Not sure how to check for null values in PHP? This tutorial will show you the two best ways to do it, with code examples and without the B.S.

How to Comment Out CSS

Learn how to comment out CSS code, what to watch out for, and how to not have it slow down the performance of your web pages.

How to Echo an iFrame in PHP

Trying to figure out how to echo an iframe in your PHP code? Here are the three ways to get it done, with code samples.

Do HTML Comments Affect Performance?

Leaving comments in your HTML documents makes it easier to edit and debug your code. But does it also have a negative effect on the speed of your website?

Can You Mix CSS and HTML?

Is it possible to mix HTML markup and CSS style sheets in the same document? And if the answer is yes, when is it a good idea to do so?

Is HTML Case Sensitive?

Do you want to know if tags and attributes in HTML are case insensitive? We have the answer for you, so read on.

How to Preview an HTML File

Learn how to preview an HTML document in your browser, as well as how to view the source code of that document in your text editor.

Is CSS Harder Than HTML?

Wondering if writing CSS style sheets is harder than HTML markup? We have the answer for you, and more.