>Opera is suppose to be fast and conserve bandwidth because it downloads the page onto your computer but it sucks for developing!
The issue is the downloading makes the changes unaffected in development mode. I spent hours trying to fix the position of a background to later find out that I had delete the downloaded data for it to display correctly.
To delete the data go to Opera>Settings>Delete Private Data.
Now Internet Explorer does the same thing but it sucks in everything. I wish IE will disappear from the face of the earth.