In what version of HTML was an <img> nestable in <a> introduced? I have a feeling it might have been really really early on, in which case prior art should hope

In what version of HTML was an <img> nestable in <a> introduced? I have a feeling it might have been really really early on, in which case prior art should hopefully stop this dead in its tracks before they've scared too many people into paying up. Unfortunately someone will have to stand up to them in court... I couldn't find any record of the actual patent they're attempting to base their claims on here.