Arguably one of the worst mistakes that can be made with a website is hiding content (inadvertently, not in a cloaking way) from search engines. Since on-page SEO and quality content have become larger ranking factors in the past 2 years (and especially since Panda first rolled out in February), we have to make sure that content is quality and visible.
I recently was auditing a client’s new website, which is luckily still in a test environment. During this audit, I saw this when I was looking at the site normally (image wireframed for confidentiality purposes, but you get the idea):
Step 1: Load your page
Navigate to your site and load it normally. Browse around the site and note where content is appearing.
Step 3: Refresh the page. This makes the change take effect.
Step 4: Browse around the site and see what you see. If everything is working correctly, that is a good sign. Pay special attention to any content that has disappeared. You must be sure that this is not content that you want displayed to the search engines, such as your main body text. If important content is hidden, go back to your developer and tell them that you will not approve the site to go live until it is fixed.