Those features include SGE while browsing, definition overlays in the SGE responses, and color-coded with syntax highlighting and other coding improvements within the SGE answers. While browsing a webpage, you can ask Google SGE to generate key points from the page. Google SGE will then summarize the web page that you are browsing. Google will not let SGE while browsing work on paywalled content. Google did tell me that a page needs to be in the Google index for SGE while browsing to work.