2 Comments. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML. Solutions to the assignments of the Coursera course "HTML, CSS, and Javascript for Web Developers" by Johns Hopkins University. Here is my CSS. This tutorial describes and demonstrates using JavaScript to manipulate and interact with iframes, showing how to access and modify properties of the iframe element, how to communicate with the document inside the iframe, gaining information from it and passing information to it, as well as limitations on such access. Applying CSS to iframe How to apply CSS to iframe. w3schools.com. Use a value of about:blank to embed an empty page that conforms to the same-origin policy.Also note that programatically removing an