SSL Labs conducted a second, much deeper survey of SSL usage earlier this year. The best crypto in the world is not going to help a site that has flaws in these critical areas. SSL Labs will be looking at the problems that really break SSL insecure session cookies, mixed content, incorrect site configuration, and distribution of trust to third-party sites. We are building a custom site crawler, which we are then going to run against the worlds 1 million most used web sites.”]
Source: https://blog.ivanristic.com/2011/05/a-study-of-what-really-breaks-ssl.html