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- :nth-of-type 4:30
- :nth Pseudo-Class Challenge 2 objectives
- :nth Pseudo-Class Challenge - Pt. 2 1 objective
- :root and :target 5:12
- :not() – The Negation Pseudo-Class 4:46
- Pseudo-Elements - ::first-line and ::first-letter 5:00
- Pseudo-Elements - ::before and ::after 8:13
- The attr() CSS Function 6:32
- Pseudo-Elements Challenge 4 objectives
- Advanced Selectors Review 6 questions
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:not() – The Negation Pseudo-Class
4:46The :not() pseudo-class is referred to as a negation pseudo-class because it selects everything except the element we specify in the selector.
Finally, there's a special pseudo-class
that's referred to
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as a negation pseudo-class because it
selects everything except the element we
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specify in the selector and we can use it
with just about any type of selector.
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So for example, in our style sheet, let's
create one of these not selectors.
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So if we wanna target all divs, that do
not have the ID of say, col-a.
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So target all the divs on the page, except
for this div with the ID col-a.
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We can do that with the not selector.
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So let's create our selector by first
targeting div followed by colon and
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then not then a set of parenthesis.
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So in between the parenthesis is where we
need to specify the type of
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element we do not want to target.
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In this case we do not want to target a
div with the ID col-a.
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So, for every div that does not have the
id col-a we're gonna give it a red border.
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So let's add a border property and let's
set the value two solid one pixel red.
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All right, so once we save our style sheet
and refresh the page,
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notice how every div on the page except
for the col-a div has the red
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border applied because we've explicitly
told the browser not to target it.
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And we can also include an element's
attribute and
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value in the not argument, and this can be
useful for styling certain form elements.
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So for example, if we want to target all
input elements in
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our form that do not have the type value
of submit.
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We can do that so let's go back to our not
rule, and
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this time in between the parentheses we'll
need to include a set of square brackets,
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and then inside the brackets we're going
to specify the attribute and value.
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So we're going to say type equals submit
then instead of div,
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we'll want to use the input selector.
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So, for input elements that do not have a
type value of submit,
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let's give them a box-shadow.
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So, once again, we'll type the box shadow
property, and let's set the first
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offset to zero, the second one to two
pixels, we'll give it a blur of zero,
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and let's set the RGBA value to black with
000,
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and finally we'll give it an alpha of .15.
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And let's make our box shadow an inset
shadow.
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So right before the first value, let's add
the keyword inset.
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So now, when we save our file and
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refresh the page, notice how the submit
button does not have the box shadow.
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But the two imput fields above it have
that inset box shadow.
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Because again, we've told the browser not
to target the submit input element.
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But, it's okay to target all other input
elements on the page, and
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that's exactly what it's doing here.
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Now finally, another good use case I've
found for the not pseudo-class is for
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targeting all but the first or last child
in a row of columns, or navigation links.
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So it looks like we need to give our three
columns a left margin,
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to create a little more separation between
the columns.
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But we don't wanna give the first column
here a left margin because we want it
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flush with the left margin of the page.
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We don't want any space here.
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Now, we can tell the browser to leave this
first column alone and
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only apply the next margin to the columns
that follow it.
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And we can do that by going to our style
sheet and let's create a new selector.
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Let me add some space here.
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This time we're gonna target the col
class, and then we're gonna say not.
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And we're gonna target every call element
that's not a first child.
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[BLANK_AUDIO]
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And for those, we're gonna give them a
margin left value of fifteen pixels.
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All right, so let's take a look.
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Once we refresh the page we can see how
Columns B and C get that
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roomy left margin while Column A remains
aligned with the left margin of the page.
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We can see that once we highlight it.
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Now, we can also do the same for the links
up top.
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Let's also give them that left margin of
15 pixels.
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So, to do that.
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We're gonna group the selector with a new
one, so this time, let's
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target the nav element, and we're gonna
target the links inside that element.
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So we're gonna say a, colon, not, and
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a set of parentheses, and we're gonna
target all links except the first child.
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And once we save our style sheet and
refresh the page, just like our columns,
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the first navigation link does not have
the left margin applied,
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while the two that follow it do.
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So again, a useful selector we can use
that prevents us from having to
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create extra hooks in our markup and
unnecessary rules in our style sheet.
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