Here is the plain English of #header .callout: Select all elements with the class name callout that are decendents of the element with an ID of header. Here is the plain English of #header.callout: Select the element which has an ID of header and also a class name of callout. Maybe this graphic will make that more clear:
Wilmington, Ohio. Wilmington is a city in and the county seat of Clinton County, Ohio, United States. The population was 12,520 at the 2010 census.
Union County Sheriff's Office, Marysville, OH. 6,534 likes Â· 860 talking about this Â· 131 were here. Sign up for Emergency Alerts-Click the Sign up... Jump to