User blog comment:Susanolivia/Experience the new Wikia/@comment-93604-20100925120341/@comment-93604-20100925182305

With flexible width, or a semi-flexible width, the page fills the available screen space such that the sidebar, and its ads, are visible on any screen size.

The sidebar is given priority. The content width expands or contracts to fit the remaining width after the sidebar gets its allotted percentage, pixels, etc..

Here is an example. For the wiki I work on I would prefer a flexible content space set for a range from zero to around 900 pixels wide.

The sidebar would be set to whatever size Wikia desires. The content space would expand its width to fill the remaining space up to 900 pixels. On wide monitors there would be empty space around the edges.