//Selector $ ( document ). ready ( function (){ //Button with ID = testbutton //# for id $ ( "#testbutton" ). click //we can select multiple items here too //$("#testbutton,strong").click ( function () { //All div go red $ ( "div" ). css ( "background-color" , "red" ); //All p tags $ ( "p" ). css ( "background-color" , "red" ); //Selecting multiple items $ ( "div, strong, #testbutton" ). css ( "background-color" , "red" ); //Selecting all items $ ( "*" ). css ( "background-color" , "red" ); //Selecting children //Selecting all p elements child of div $ ( "div > p...