POST methods, WorldWideWeb can't even interact with forms but information is often visible.
Take, for example, my blog. It's easy to consume, meaning anything can traverse it and index it with minimal effort. Anyone with an out-of-date browser arguably can access it. Incredibly many news sites are usable albeit awkward, like CNN.com and NYTimes fair well. ABCNews does not, nor will anything requiring a form like Google.com.
Information architects should take note; there's something to be said about resilient markup languages are.