Drop a policy, a specification, or any document. Each part of it is compared with the held corpus, and the closest provisions are shown beside it with their frozen address and the hash of the official file.
Your document never leaves this browser: it is read, compared and ranked on your own machine, and nothing is uploaded. Closeness of wording is not a legal relationship. This page does not say a provision applies to you, that your document complies, or that anything is missing from it. It shows you held text to read.