Throughout the World Cup the Google Doodle has been FIFA themed, and clicking it takes you to a search for the latest game. Today it's United States vs Portugal.
The search brings up a chart which appears to be a summary of the game. It looks like it should be obvious what everything means but I can't make heads or tails of it.
Is this a standard football (soccer) game chart?
If so, how is it meant to be read?
Is there a key available?
Full chart reproduced below in case Google results change.