I'm going to reply to a few point.
Papaf, you may find my response offensive and that fine if you wish to interpret it that way. It is certainly not meant to be offensive. It is meant to get the point across about customer service.
What I found offensive is the rude way in which you replied to what was clearly a joke. I also find inappropriate the thought that, in order to get the point across as you said, you find it's ok to be rude at people. It seems you imply that your request will otherwise be ignored.
I know how to build websites and I understand the complexities of making a web site cross browser compatible.
I couldn't imagine telling my paying clients which browser they should use or support. It's poor customer service. I am a PixInsight customer and I expect better service than to be told that a problem that affects many is MY problem. It isn't my problem, it is PixInsight problem and they should fix it. If it takes them 10 minutes or 2 hours is irrelevant. They have everything to gain and little to lose.
I'm sorry but, even rereading the thread and my post multiple times, I can't for the life of me find where I point my finger at _you_. Yet you seem to imply someone did. Everyone here is blaming IE, yet you take it personally.
Also, let's say it takes 10 minutes to fix the problem. In which way should it be fixed, though? The site is currently perfectly within HTML standards, yet IE is interpreting it incorrectly. So, we just go around it, like many sites do. Where will this take us in the long run? I know I'm getting a bit philosophical here, but hey, you can't expect much more from a linux user, can you?

Also, if we talk about time lost, how much time is going to take you to install Chrome and/or Firefox? Have you considered any of the benefit other users said to you in this thread? Maybe the fault you found with IE is the right nudge to make you change browsers.
If you think about it for a few minutes you may realize that all of the PixInsight users benefit by them fixing the problem also, simply by virtue of more users (IE users) being able to use their website without having to change browsers or figure out how to change their browser to allow them to read the text with proper contrast.
More visitors mean more customers which mean more revenue and more revenue means a better end product for YOU.
Again, you're implying you're talking to Pleiades software directly, while I clearly stated I'm a mere user. But this got me thinking: why don't we get many more complaints? Maybe, as I said, changing browser is not the end of the world. You said earlier that 99.999% of sites are in readable text. But maybe they would be better with other browsers nonetheless. Some bugs can be big, like the one you've seen on pixinsight.com, but others can be subtle. You can never know if you don't try.
So while you might think I am "ignorant" for my choice of browser with which I read the tutorials, I can assure you that an ounce of good customer service is worth its weight in gold.
Again, in this snip you are clearly reading my post wrong. Please take the time to read it again. I never called you ignorant for the choice of browser. I assumed you, as the vast majority of users of PI, had no idea how a site was built. You stated otherwise, I stand corrected. But I never mentioned your choice of browser as your source of ignorance, at all.