Image Preview In Newthread And Editpost

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But yes, if we have a lot of custom thread fields attached to a forum, I think it is "better" to create a template for it.
So, it is more "organized", and looks "better". I use tabs in my newthread template to organize the fields.

To validate our forum page, try to start validating our header and footer first (at least that is what I do first when creating a new themes).
If there is an "error" in that template, it means all page will have an "error".
Then our index (not too hard to validate this page), next to threadlist (more template involved in this page), then showthread.