Make specific elements in designMode iframe read-only?

I have an iframe which has designMode set to 'on'. In it, I have a div which the user should be able to type in, and also in the if开发者_StackOverflowrame, I have another div which the user should NOT be able to type in.

Is there a way to do this? Using contentEditable is not a solution in my case.

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Apply both -moz-user-select: none; and -moz-user-modify: read-only to the element. There are also -webkit equivalents. Remember, designMode doesn't work in Internet Explorer.