Datasets:
pre-view
/
CS50-raw

Dataset card Data Studio Files
xet
Community
1
text
stringlengths
1
81
start
float64
0
10.1k
duration
float64
0
24.9
I now save the variables.scss file.
6,862.7
3.04
And now, without doing anything-- take a look at my terminal--
6,865.74
3.3
Sass detected a change to variables.scss,
6,869.04
3.61
so it gave me a new version of my original CSS file.
6,872.65
4.38
If I go back to my web browser now, refresh the page, now, all of the text
6,877.03
4.51
is green, as I would expect it to be.
6,881.54
3.59
So that's one of the very powerful features that Sass gives us.
6,885.13
3.5
It gives us the ability to add variables to our CSS code just
6,888.63
3.54
to factor out commonalities.
6,892.17
1.59
If there are common fonts, common colors, common borders, common styling,
6,893.76
3.96
that I want to apply to a lot of different things,
6,897.72
2.28
it becomes much easier just to use Sass in order to do so.
6,900
4.31
And finally, we'll take a look at a couple of other features
6,904.31
2.92
that Sass gives us the ability to do, one of them
6,907.23
3.18
is the ability to nest CSS selectors inside of other CSS selectors.
6,910.41
5.5
So one thing you've seen so far, for example,
6,915.91
2.19
is that in CSS, if I wanted to style all of the unordered lists that are inside
6,918.1
5.93
of divs, for example, I could say like, div arrow unordered list,
6,924.03
5.67
in order to style unordered lists that are inside of divs.
6,929.7
4.74
What Sass will do is that will give us a bit of a nicer syntax for doing
6,934.44
4.2
this type of thing, in particular, by allowing us to nest CSS inside
6,938.64
4.98
of other pieces of CSS.
6,943.62
2.45
So just as an example of this, I'll go ahead
6,946.07
2.11
and open up a file I already brought, called nesting.html.
6,948.18
4.74
And so here is what we might see inside of nesting.html.
6,952.92
2.63
Here is the body of the page.
6,955.55
2.44
Inside the body of the page, I have a div, inside of which
6,957.99
3.9
is a paragraph inside the div and also a list, an unordered list,
6,961.89
3.72
or ul, that's inside of this div as well.
6,965.61
3.67
And then we also have a paragraph that's outside of the div.
6,969.28
2.93
And a list that's outside of the div in addition to that.
6,972.21
3.2
So a number of different elements, some of which are located inside
6,975.41
2.8
of other elements.
6,978.21
1.05
And what I'd like to do is be very precise about how I style these pages.
6,979.26
5.39
What Sass is going to allow us to do is it
6,984.65
2.41
lets us write a Sass file that looks a little something like this.
6,987.06
4.39
Let's take a look at what it's doing.
6,991.45
1.55
It's saying, for the entire div, I would like
6,993
2.97
to give that div a font size of 18 pixels.
6,995.97
3.18
And then, what CSS normally doesn't allow us to do,
6,999.15
3.06
but we can do now using the power of Sass,
7,002.21
2.4
is say, for any paragraphs that are inside of that div,
7,004.61
3.9
go ahead and give those paragraphs the color of blue.
7,008.51
2.73
And for any unordered lists that are inside of the div,
7,011.24
3.09
give those unordered lists a color of green.
7,014.33
2.94
By nesting these CSS selectors inside of others,
7,017.27
3.18
we've been able to get across the idea that I only
7,020.45
2.91
want to style the paragraph if it is inside of a div.
7,023.36
3.42
And this is just a little bit of a nicer, cleaner syntax
7,026.78
3.12
for doing some of these more complex styling tasks that might come up.
7,029.9
4.57
So what does this actually look like?
7,034.47
1.55
If I like take this SCSS file and turn it into normal CSS,
7,036.02
4.17
what is the result going to be?
7,040.19
1.83
Well, let's take a look.
7,042.02
1.36
We can try it out by let me go into my nesting folder
7,043.38
3.77
where all these files are located.
7,047.15
1.89
And if I run Sass nesting.scss, turn it into nesting.css,
7,049.04
7.93
now let's open up nesting.css and see what it looks like.
7,056.97
3.74
Here, it's turned into a take all of the divs,
7,060.71
2.73
give them a font size of 18 pixels.
7,063.44
2.24
And then, we're using the same descendant selector notation
7,065.68
3.97
that we saw before, where all the paragraphs inside of divs
7,069.65
3.27
should be colored blue, all the unordered lists inside of a div
7,072.92
3.21
should be colored green.
7,076.13
1.29
And this certainly works.
7,077.42
1.21
And we could have just written this CSS from the beginning,
7,078.63
2.75
but it can be a little bit cleaner, a little bit easier to read to use Sass
7,081.38
4.35
in order to really say, paragraphs inside of divs
7,085.73
3.2
should be structured this way, unordered lists are styled in some other way.
7,088.93
3.83
And using this nothing approach just makes it often easier
7,092.76
2.84
to take a look at this SCSS page and really understand
7,095.6
3.96
how all of the different style code interacts with each other.
7,099.56
3.83
So after all of this now, if I open up nesting.html,
7,103.39
5.2
we might see something that looks a little something like this.
7,108.59
3
The paragraph inside the div and the list inside of the div, those
7,111.59
3.72
both get changes to the way that they've been styled.
7,115.31
3.18
But unlike them, these paragraphs outside of the div
7,118.49
3.24
and the list that is also outside of the div,
7,121.73
2.13
those get styled a little bit differently.
7,123.86
3.43
So two features now we've seen inside of Sass.
7,127.29
2.45
We've first seen the ability to have variables
7,129.74
2.57
to make sure we're not repeating ourselves
7,132.31
1.75
in many places throughout the code.
7,134.06
1.68
And now, we've seen the ability to nest CSS selectors inside of each other
7,135.74
4.62
by taking advantage of Sass.
7,140.36
2.52
And finally, we'll take a look at one last feature
7,142.88
2.46
that Sass is going to give us.
7,145.34
1.44
And that is something called inheritance.
7,146.78
2.28
If we have certain CSS selectors that are related to other CSS selectors,
7,149.06
4.65
but they're may be adding some additional information.
7,153.71
3.18
And in this case, I'm actually going to show you the finished product first.
7,156.89
3.46
So let's go into inheritance and let me open up inheritance.html.
7,160.35
5.75
And here, you see I've tried to almost implement
7,166.1
2.79
Bootstrap-style alert messages in HTML.
7,168.89
3.48
I have a success message up at the top, a warning message, and then
7,172.37
2.91
an error message.
7,175.28
1.2
And each of these messages you'll notice are styled differently.
7,176.48
2.88
In particular they're each a different color.
7,179.36
2.13
But despite that, they share a lot in common.
7,181.49
2.52
They share a common border.
7,184.01
1.26