I was looking at a nice site today and when I tried to see their 'source code' or 'page source', nothing happened. So, how do you block someone from seeing your meta tags and such?

Is there a downside to doing this sort of thing?

Can't imagine how this is possible. Have you tried looking for the code in different browsers?

Could you message me the site so I can have a look?

nothing happened
IE used to have occasional problems with this, don't know if it's been fixed in v7. If it's IE, try flushing your cache, restarting and giving it another go.

you can do a javascript to block right clicks.... and it is possible the site is all generated code.... or a real old trick leave a major amount of white space and push code a couple of pages down... when you look nothing appears when it loads but there is a scroll button

You cannot hide the source code. Any JavaScript won't stop someone select View>Source inside Internet Explorer (drop down menus, not right click on the page).

And then of course, you can just run Fiddler to catch anything going to (and from) your browser.

Someone will just market HTML as 'Open Source Presentation' or similar soon!