Understanding only selectors, :only-child, :only-of-type

- [Instructor] The next topic is the only selectors, … including only child and only of type. … Let's talk about the easy one first. … That is the only child selector. … Just like in real life, … an only child is one without siblings … of that particular type. … So let's go ahead and take a look at an example of this. … We have here in line number eight, … we have a strong tag here that's all by itself. … It is an only child. … Also, if you take a look here in line six, … this strong tag at the end of the sentence … is an only child also. … It is a child of the M tag … which is surrounding that. … So if we go ahead and write a strong colon only child, … we wind up getting both of those things selected. … That's the definition of an only child. … There it is. … Only of type is a little bit different. … So that indicates that there may be several siblings, … but there's only one of this particular type. … So an example of that is here in the aside, … the aside actually has two children, …