- :first-child and :last-child 4:15
- :first-child and :last-child Challenge 2 objectives
- :only-child and :empty 4:58
- Substring Matching Attribute Selectors - "Begins With" and "Ends With" 8:19
- Substring Matching Attribute Selectors - "Contains" 6:44
- Substring Matching Attribute Selectors Challenge 3 objectives
- Element States Pseudo-Classes 6:20
- Structural and Element States Pseudo-Classes Review 5 questions
Preview
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:first-child and :last-child
4:15In this video, we'll learn how to target first and last-child elements with the :first-child and :last-child structural pseudo-classes.
[NOISE] There's a lot more to CSS pseudo
classes than the link and
0:00
user action pseudo classes we covered back
in CSS basics.
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CSS actually has a number of other helpful
pseudo classes,
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beginning with structural pseudo classes,
that target elements according to
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their position on the page and their
relation to other elements.
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This is where we'll really start to see
the real power and
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flexibility behind many of the more
advanced CSS selectors.
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So let's continue with pseudo classes by
next taking a look at how to
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target first and last child elements.
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So first, we'll need to launch the new
workspace for this lesson.
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And as we can see when we click the
preview button the page consists of
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a simple list containing ten items.
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Now if we take a look at the index dot
html file we can see that the markup for
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that list is an un-ordered list containing
10 list items.
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So we can say that all 10 of these LI
elements are children of this parent UL.
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So now let's say we only want to target
and style the first item in our list.
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So item one.
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Well, we can use the first child
structural pseudo class to do just that.
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So let's go back to our work space and
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we'll bring up the style.css file right
here in the CSS directory.
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And let's create that first child selector
by
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first targeting an li element followed by
the first child pseudo-class.
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So we'll say :first-child.
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So like I said,
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this selector will target the list element
that is the first child of its parent.
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So in the rule, let's go ahead and give it
a background property.
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And we're going to set the value to #52.
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BAB3 and we're gonna set the color to
white all right.
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So let's take a look.
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We'll save our style.css file and
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when we refresh the browser notice that
the first list item in our unordered
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list is the only one with that aqua green
background color and the white text color.
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So similar to the first child pseudo
class, the last child pseudo class.
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Allows us to target an element that's the
last child of its parents.
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So let's see how that works.
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We'll go back to our style sheet and
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let's change the first child selector to
last child.
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So now when we go back to our list and
refresh the page.
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Now we can see how the styles are applied
to the very last list item only.
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And it doesn't matter how many list items
we add or remove from this unordered list,
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the very last one will always have that
background color and white text color.
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So, that's why these first and
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last child selectors can come in really
handy when styling lists or navigations.
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So, I'm gonna go back to our style sheet
and
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set this selector back to the first child
pseudoclass.
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I'm gonna go ahead and undo that.
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So, when we take a look at it again, once
again,
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that first list item, takes on those color
styles.
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But now, let's say that we want to remove
this unnecessary border here.
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In the last list item,
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well now we know that we can easily do
that with a last child pseudo class.
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No problem right?
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So let's go back to our style sheet and
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right beneath the first child selector we
just wrote.
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Let's type li colon last dash child.
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And, we'll add a border property and set
the value to none.
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So now when we save our style sheet and
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refresh the page we can see that the
bottom border is now gone.
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This is really great because instead of
creating a separate class for
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the first list item to add these colors.
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We're creating a separate class to remove
the border here in the last list item.
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We can do this in a more efficient way
with the first and
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last child pseudo classes.
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Now in a later lesson, we'll learn how to
target any combination of these child
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elements, with more specific structural
pseudo classes.
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