CSS makes content disapHpear?

You must validate and clear up mal-formed markup before being able to judge cross browser issues.

But I did.

I've checked all the CSS until it was ok.

No not css that is relatively unimportant as there is provision for error handling built into CSS but markup doesn't each browser has to make a best guess at what to do with bad markup.

So, what are you referring to?

Oops. Covered already. Carry on.

HTML is a computer language and like all computer languages has very specific rules. Without correctly formed and valid html all else is besdide the point.

If you do not understand this you will get nowhere writing web pages. You must write valid html according to the rules of html and without that you have nothing. It is easy and fast to validate. There are even browser add ons what will make your html well formed and valid.

Of course, well formed and valid html can still be utter crap, but without validity your html will not even be bad, it will not be html.

You need to learn to write valid, wall formed, and semantic html to succeed to any useful extent. Semantic html simply means you use the available tags to mark up the text they were designed to mark up. The P tag for paragraphs, the UL and LI tags for unordered lists, and so on. Choose tags that reflect the meaning of your content.

If you write valid, well formed, and semantic html then CSS will be a doddle. If you fail to do all three of these things you will cause yourself endless trouble and difficulty.

A famous physicist remarked of one of his colleage's ideas that it was "not even wrong", meaning thereby that there was no interesting question that arose from it. Wrong theories are extremely useful in physics and science in general, but theories from which no interesting questions arise have been known ever since as "not even wrong" and it is the greatest insult that can me made of a scientific idea.

Similarly, without well formed, syntactically correct, and semanticly marked up html your page will be "not even wrong". It won't even be good enough to be bad.

Hello Ed,
I know that. Everytime I make a webpage from scratch - at my own - I do that. But this is not the case. I've been modifying a template according to client's instructions.

But, in the demo of the template http://templates.joomlart.com/ja_opal/?tp=1 it seems to work in every browser, in this one, it doesn't work, I don't know why.

I spend several years working in that particular kind of hell and I won't willingly go back. I'd start by doubling or trebling your usual fees and then reducing the expectations of the client a great deal and making no guarantees/

If you are desparate for the money and can't do that, they I send you my heartfelt sympathies but will not even try to help you with it.

Hi again,
from what I've been checking in the code it's not so difficult, as it just adjust the modules to the positions created - that we previously create in CSS.

What is bothering me is just that incompability, or that code that is collapsing the rest in the other browsers...

No one?