jsFiddle is the perfect solution; it provides a custom environment (based on user selections) to test (or fiddle with) your JavaScript, HTML, and CSS code ... one of the examples — Delayed ...

“From JavaScript ... text, images, video and page layout are displayed in a browser. HTML developer responsibilities typically include building webpages and templates with HTML and CSS, writing ...

For example, you can use an image as a clicking button for a particular link. The problem is that the browser displays a border around this image. To remove the border in HTML/CSS, you need to change ...