.first{
	background-image: repeating-radial-gradient(rgb(255, 0, 0), rgb(0, 0, 255)), url("https://mdn.mozillademos.org/files/3795/radial%20gradient.png");
}
.second{
	background-image: radial-gradient(circle at center, red 0, blue, green 100%)
	/* A gradient at the center of its container, starting red, changing to blue, and finishing green */
	/* Also there is no ending semicolon */
}
#third{
	background-image: radial-gradient(at right 20em bottom 0% ,  red , transparent  0 , blue , )
	/* extra spaces and absent last color stop*/
}
.fourth{
	background-image: repeating-radial-gradient(farthest-side at right 20em bottom 0%, blue 0, red ,), radial-gradient(circle farthest-side at bottom 0% right 20em, green, yellow;
	/* Improperly ended color stop list: missed closing round bracket */
}
.fifth{
	background-image: radial-gradient(ellipse 100% 5cm at left 10em bottom 0%, red, green 20% , nonexistant_color);
	/* Non-existing color in 3rd color stop */
}