This page was created to calculate the CSS specificity of a stylesheet (not including the inline or style rules; the "a" part of the equation). Before this little project, I didn't have a clear understanding of the specificity rules. Now, after creating this page, I don't think I'll need this application.
Did you know that you don't have to link to an external image file when using an element in HTML, or declaring a background-image in CSS? You can embed the image data directly into the document with data URIs.