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They share a common font. | 7,185.27 | 1.32 |
They share a common size
and many other properties | 7,186.59 | 2.7 |
are all shared between these elements. | 7,189.29 | 1.8 |
There are just some things that are
a little bit different about them. | 7,191.09 | 3.75 |
I could have written three
different CSS selectors | 7,194.84 | 2.46 |
to deal with all of these cases, but
there might be some repetition there. | 7,197.3 | 3.73 |
So here's what I can do by
taking advantage of the features | 7,201.03 | 2.93 |
that Sass gives me. | 7,203.96 | 1.65 |
Let me go ahead and look at
inheritance.scss to look at the code | 7,205.61 | 4.95 |
for doing this. | 7,210.56 | 1.97 |
And it looks a little
bit cryptic at first. | 7,212.53 | 3.12 |
But here's what I've defined. | 7,215.65 | 1.71 |
I've here defined using a percent sign
that this is what a generic message is | 7,217.36 | 4.44 |
going to be, something that I can extend
later to add additional information to. | 7,221.8 | 4.41 |
All of the messages, whether they be
success messages or danger messages | 7,226.21 | 3.18 |
or warning messages, they're
all going to have the same font. | 7,229.39 | 2.81 |
They're all going to
have the same border. | 7,232.2 | 1.75 |
They're all going to have the
same padding and margin, spacing | 7,233.95 | 2.58 |
around and outside of it. | 7,236.53 | 1.56 |
But each of the specific messages
are going to be slightly different. | 7,238.09 | 4.86 |
How are they different? | 7,242.95 | 1.09 |
Well, let's take a look down here. | 7,244.04 | 1.91 |
Anything with a class of success, I'm
going to say extends this message. | 7,245.95 | 6.12 |
And by extends this message what I
mean is that anything with a class | 7,252.07 | 3.42 |
of success is going to inherit all
of these CSS properties-- the font, | 7,255.49 | 4.77 |
the border, the padding in the margin-- | 7,260.26 | 2.4 |
but it's going to add
additional information to it. | 7,262.66 | 2.13 |
In particular, we're
going to add a color. | 7,264.79 | 2.34 |
We're going to say that
for success messages, | 7,267.13 | 1.89 |
the background color
is going to be green. | 7,269.02 | 2.71 |
I've extended the basics of
what a message is, but said | 7,271.73 | 2.78 |
that this message in particular has
some additional style that we're | 7,274.51 | 3.6 |
going to assign to it as well. | 7,278.11 | 2.22 |
And the other two messages
behave in very similar ways. | 7,280.33 | 2.67 |
My warning message extends
the message, but instead | 7,283 | 3.18 |
says the background
color should be orange. | 7,286.18 | 2.22 |
And finally, the error message
also extends the message. | 7,288.4 | 2.82 |
But this time, it gives us the
background color of red instead. | 7,291.22 | 4.51 |
So now, when you compile
this all together | 7,295.73 | 2.3 |
into inheritance.css, which
I compiled it in advance, | 7,298.03 | 4.3 |
this is what this is
ultimately going to look like. | 7,302.33 | 2.18 |
It translates what I've
written into saying, | 7,304.51 | 2.34 |
all right, success
and warning and errors | 7,306.85 | 2.82 |
should have all of these properties. | 7,309.67 | 2.19 |
But success should also
have this background color, | 7,311.86 | 2.36 |
warning should have
this background color, | 7,314.22 | 1.75 |
error should have this background color. | 7,315.97 | 1.96 |
So again, we could
have written this CSS. | 7,317.93 | 2.18 |
There is nothing that
Sass does that we couldn't | 7,320.11 | 2.76 |
have written ourselves using CSS. | 7,322.87 | 2.58 |
Sass we'll just make it a little bit
easier to do many of the same thing. | 7,325.45 | 3.67 |
So we can write things in a
little bit of a nicer syntax | 7,329.12 | 2.57 |
by saying the success message
inherits from the message | 7,331.69 | 3.15 |
but adds a background color. | 7,334.84 | 1.6 |
And likewise, the warning and
error messages do the same thing, | 7,336.44 | 3.36 |
but in a simpler syntax and a bit
of a nicer syntax, such that later | 7,339.8 | 3.8 |
we can let the computer take the Sass
code and compile it into CSS instead. | 7,343.6 | 6 |
And so those now are
some of the fundamentals | 7,349.6 | 2.46 |
of what we've seen in building
web programs using HTML and CSS. | 7,352.06 | 3.99 |
We've seen how we can use HTML to
describe the structure of our web page, | 7,356.05 | 3.9 |
deciding what's going to show up where
on the page, and then we looked at CSS | 7,359.95 | 3.57 |
and how CSS can then be used to style
our web page in various different ways, | 7,363.52 | 4.05 |
adding custom styling
like colors and layouts, | 7,367.57 | 2.49 |
but also thinking about
things like responsive design, | 7,370.06 | 3.03 |
like what happens on a
mobile screen or on a tablet, | 7,373.09 | 2.52 |
and making sure that our web pages
look good on those screens too. | 7,375.61 | 3.67 |
And then finally, we took a look
at Sass, an extension to CSS, | 7,379.28 | 3.43 |
that adds a number of
additional features, | 7,382.71 | 1.75 |
features like variables and
nesting and inheritance, | 7,384.46 | 3.14 |
that make it even easier for
us to be able to write style | 7,387.6 | 2.77 |
that we can apply to our web pages. | 7,390.37 | 2.09 |
From there, we're going
to be transitioning now | 7,392.46 | 1.96 |
to looking at how we can use HTML
and CSS in larger web applications | 7,394.42 | 4.14 |
as we begin to incorporate other
tools, tools like Python and JavaScript | 7,398.56 | 4.11 |
and other languages and
frameworks altogether. | 7,402.67 | 2.25 |
So this is Web Programming
with Python and JavaScript. | 7,404.92 | 3.09 |
We'll see you next time. | 7,408.01 | 2.09 |