This is a new site on the block, that grew out of Heidi Adkisson’s Master Thesis "Identifying De-Facto Standards for E-Commerce Web Sites".
It’s aim is to help designers and developers to understand and identify some of the ‘de-facto’ standards that we use on the web today.
That’s not to say these are "THE RULES!", as Heidi herself explains on the about page:
"The data presented on this site are intended to inform design decisions, not dictate them. Common practice does not necessarily equate with best practiceâ€”and the relationship between consistency and usability on the Web is remains a lightly researched area. A goal of this site is to encourage and highlight related empirical research. Youâ€™ll find throughout the site links to related studies."
Hat Tip: The Web Standards Project