Does the article's history page keep a record of what the content of the link was when it was updated? I guess it doesn't, but assuming that IA records every l

Does the article's history page keep a record of what the content of the link was when it was updated? I guess it doesn't, but assuming that IA records every link as it gets added you can use the history page to see which snapshot on the wayback machine corresponds to the link at the time it was added. You could use that to compare to now, but unless you made sure to snapshot the content regularly (whenever the page is edited?) you wouldn't necessarily know when the content drift happened, or if multiple changes have happened to the content over time. Using the history page would likely give you enough information to, for example, do a study on links to find out how many have different content now vs when the link was added.