We spent about half-an-hour discussing this issue. As it transpired, I kept getting these fatal errors when I browsed your site from one PC but I didn't get them on another one. I think it must have been something in my local browser cache. It doesn't matter and I retract my earlier remarks.
The essential question in this case is how do these errors manifest themselves as far as a normal visitor to your website is concerned? I believe that the answer is that these warning messages will not, in any way, detract from the end-user experience and I think that's what should always be foremost in your mind.
I visited your site today, using Firefox, and I saw nothing that detracted from the "user experience".
Many design tools will flag Javascript or CSS errors and, in most cases, this is fairly "normal". I have not seen too many websites that are immune from these warning messages ... even Microsoft's site! There is such a thing as over-analysis and the Law of Diminishing Returns. If your site was my site, I wouldn't worry about these warnings unless, as I wrote above, they detract from or adversely impact the "end-user experience".
Do these warnings, in your opinion, impact in any way on the end-user experience?
