The blue vertical line displayed in the waterfall timeline on the right panel represents the firing of the DOMContentLoaded event, and the red vertical line represents the Load event. These two indicators are provided to help you determine the total time it takes for pages to load and gives you a benchmark from which to make improvements to your pages. The two events are displayed here, and the screen capture is further down the named resources list.
Ryan has performed in a broad range of technology support roles for electric-generation utilities, including nuclear power plants, and for the telecommunications industry. He has worked in web development for the restaurant industry and the Federal government.