In this paragraph is used to show the font the element EM, which you can see as red except the name of the element and the declaration, because I have used the declaration {color:red;} to the element EM.

In this paragraph is used to show the font the declaration {color: rgb(235,10,50);}.

In this paragraph is used to show the font the declaration {color: rgb(75%,20%,30%);}.