Created attachment 65110 [details] screenshot %subj%
It is happens with the resources that have been cached. These resources have Status Code 304. The problem has been found on Chromium 6.0.495.0. Sample url http://stackoverflow.com/questions/3535911/the-display-order-of-css-rules-in-chrome-developer-tools
Is this a duplicate of 76176? (fixed in r104887)