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Dude my dude.
Another talk about CSS?
What’s to know?
CSS is fraggin easy.
Wow that’s so hard.
It’s a red box.
.box {
width: 100px;
height: 100px;
background: red;
}
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Here’s what some super
smart dude once pontificated
about CSS.
CSS takes a day
to learn but a
lifetime to master.
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The Royal We
Chris Coyier @chriscoyier
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Know everything? OK.
Instead of listening to me, here is a...
SUPER CSS SUPER CHALLENGE
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Grand Canyon of CSS
Pseudo Elements
For fun and profit!
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Here’s what we
are going to learn:
1) What they are
2) How to use them (syntax)
3) Why they are cool (theoretically)
4) Why they are cool (in practice)
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You already know
how to use them!
:visited :hover :active :link
:first-child :last-child :nth-child() :nth-of-type()
:enabled :disabled :checked :indeterminate
:focus :target :root :lang()
“Pseudo Class Selectors”
http://css-tricks.com/pseudo-class-selectors/
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:before
:after
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In
div:before {
content: "Robots ";
}
http://jsbin.com/pseudo-basic
HTML
CSS
In
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In
div:before {
content: "Robots ";
}
http://jsbin.com/pseudo-basic
HTML
CSS
In
div:after {
content: " Disguise";
}
Robots Disguise
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No content
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So what’s with the
different name?
Pseudo selectors select elements that
already exist (perhaps in different states).
Pseudo elements create new content that
doesn’t exist (yet).
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THE OCEAN DOESN’T MAKE
RUINS, IT MAKES NEWONES.
http://www.youtube.com/watch?v=_naLuRykun8
Pseudo Elements
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::before
::after
::first-line ::first-letter
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:before
:after
:first-line :first-letter
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In
div:before {
content: "Robots ";
}
http://jsbin.com/pseudo-basic
HTML
CSS
In
div:after {
content: " Disguise";
}
Robots Disguise
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In
Resulting
HTML
(sorta)
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Robots
In
Disguise
Resulting
HTML
(sorta)
Not “before/after
the element”...
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Robots
In
Disguise
Resulting
HTML
(sorta)
It’s before/after the
content inside.
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Blah blah blah
More stuff
Nothing to see here.Slide 22
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Robots
Resulting
HTML
(sorta)
Blah blah blah
More stuff
Nothing to see here. DisguiseSlide 23
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It’s only a model...
(Not really in DOM)
CAMELOT!
CAMELOT!
CAMELOT!
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Not for “no content” elements • Allows but shouldn’t • Styles as if was inside • Checkboxes • Radio Buttons
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HTML
CSS
Graphic design will save the world
right after rock and roll does.
“
”
blockquote:before {
content: "\201C";
}
blockquote:after {
content: "\201D";
}
Graphic design will save the world right after rock and roll does.David Carson
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RABBLE RABBLE RABBLE!
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Graphic design will save the world
right after rock and roll does.
blockquote:before {
content: "\201C";
position: absolute;
top: 0; left: -30px;
font-size: 60px; color: #999;
}
http://jsbin.com/pseudo-blockquote/
HTML
CSS
“
Graphic design will save the world right after rock and roll does.
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blockquote p:first-child:before {
content: "\201C";
}
blockquote p:last-child:after {
content: "\201D";
}
HTML
CSS
Graphic design will save the world right after rock and roll does.
Another example paragraph
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h1:before {
content: “CSS-Tricks”;
}
h2:before {
content: “A web design community.”;
}
HTML
CSS
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Bad for accessibility
Bad semantically
Bad for SEO
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Screen Readers
NVDA don’t read
Jaws don’t read
Window Eyes don’t read
Testing by Lucica Ibanescu
http://cssgallery.info/testing-the-accessibility-of-the-css-generated-content/
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CSS takes unicode entities (\0026)
... as opposed to ...
named entities (&) or
numeric entities (&)
Hot tip: Need a new line? Use “\A”
content: "\201C";
?
?
?
WTF
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http://www.evotech.net/blog/2007/04/named-html-entities-in-numeric-order/
'➜'.charCodeAt(0).toString(16);
http://rogieking.com/post/9291629610/charcodeat-0-tostring-16-outputs-279c
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content can be ...
1) Text
div:after {
content: “------------”;
}
3) Attribute
div:after {
content: attr(data-tip);
}
2) Image
div:after {
content: url(smiley.png);
/* or gradient */ }
4) Counter
ol > li:after {
content: counter(li);
}
or, nothing!
content: “”;
but not HTML
content: “
Front End Design!!
”;Slide 35
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- Chris Coyier
- [email protected]
- @chriscoyier
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Combining
with media queries
CSS @media (min-width: 1024px) {
li:nth-child(1):before {
content: “Name: “; }
li:nth-child(2):before {
content: “Email: “; }
li:nth-child(3):before {
content: “Twitter: “; }
li:before {
display: inline-block;
width: 100px;
text-align: right; }
}
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http://css-tricks.com/css-media-queries/
mobile portrait
mobile landscape
tablet
small monitor
large monitor
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No content
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Self!
You know what
would be neat?
You fade in
pseudo elements
on hover.
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TOTAL
EPIC
FRICKING
DISASTER
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You can’t animate
or transition
pseudo elements.
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But WAIT!
You totally can
in Firefox 4+
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Your mom
a:after {
content: attr(data-tooltip);
position: absolute;
bottom: 130%;
left: 20%;
background: #ffcb66;
padding: 5px 15px;
white-space: nowrap;
}
http://jsbin.com/pseudotooltip/4/edit
HTML
CSS
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No content
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Your mom
a:after {
content: attr(data-tooltip);
position: absolute;
bottom: 150%;
left: 20%;
background: #ffcb66;
padding: 5px 15px;
white-space: nowrap;
opacity: 0;
-moz-transition: opacity 0.5s ease;
-webkit-transition: opacity 0.5s ease;
-o-transition: opacity 0.5s ease;
}
a:hover:after {
opacity: 1;
bottom: 130%;
}
HTML
CSS
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No content
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Remember kids,
you get two pseudo
elements for every
element.
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a {
position: relative;
}
a:after {
content: attr(data-tooltip);
bottom: 130%;
left: 20%;
background: #ffcb66;
padding: 5px 15px;
color: black;
-webkit-border-radius: 10px;
-moz-border-radius : 10px;
border-radius : 10px;
white-space: nowrap;
}
a:after, a:before {
position: absolute;
-webkit-transition: all 0.4s ease;
-moz-transition : all 0.4s ease;
-o-transition : all 0.4s ease;
opacity: 0;
}
CSS a:before {
content: "";
width: 0;
height: 0;
border-top: 20px solid #ffcb66;
border-left: 20px solid transparent;
border-right: 20px solid transparent;
left: 30%;
bottom: 90%;
}
a:hover:after {
bottom: 100%;
}
a:hover:before {
bottom: 70%;
}
a:hover:after, a:hover:before {
opacity: 1;
}
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No content
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Nicolas
“Dr. Pseudo Element”
Gallagher
http://nicolasgallagher.com/
@necolas
You can’t talk about Pseudo Elements
without talking about...
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No content
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body {
background: url(background.png) -15% 0 repeat-x;
}
body:before {
background: url(midground.png) 35% 0 repeat-x;
}
body:after {
background: url(foreground.png) 65% 0 repeat-x;
}
body:after, body:before {
content: “”;
position: absolute;
top: 0; right: 0; left: 0;
height: 100px;
}
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No content
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Fun with Blurred Text
...text and stuff...
Read on! →4/21/2011
13 comments
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Shapes!
These are easy.
These are less easy.
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.star {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-bottom: 100px solid red;
position: relative;
}
.star:after {
width: 0;
height: 0;
border-left: 50px solid transparent;
border-right: 50px solid transparent;
border-top: 100px solid red;
position: absolute;
content: "";
top: 30px;
left: -50px;
}
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http://css-tricks.com/examples/ShapesOfCSS/
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http://nicolasgallagher.com/pure-css-gui-icons/demo/
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Wouldn’t this
be nice?
div {
background: url(awesome-graphic.jpg) center center no-repeat;
}
div:hover {
background-opacity: 0.5;
}
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Yay!
div:after {
position: absolute; top: 0; left: 0; right: 0; bottom: 0;
content: url(awesome-graphic.jpg);
z-index: -1;
opacity: 0.5;
}
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What about this?
div:after:after { }
div:before(2) { }
div:outside { }
div:outside(2):after { }
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The W3C spec’d
that in 2003.
http://www.w3.org/TR/css3-content/
div:after:after { }
div:before(2) { }
div:outside { }
div:outside(2):after { }
Yay! Want!
Reality
http://dev.w3.org/csswg/css3-content/
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Old Spec New Spec
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Browser Support
3.5+
3.0- positioning issues
6+
9+
8 :: / :hover / z-index
7-
1+
1.3+
http://css-tricks.com/browser-support-pseudo-elements/
Remember, CSS TWO not THREE
85%
CSS-Tricks
97%
Other tech
92%
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Here’s what we
learned:
5) The Future?
The CSS3 Spec - We need to use them more - Transitions
1) What they are
2) How to use them (syntax)
3) Why they are cool (theoretically)
4) Why they are cool (in practice)
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http://jsbin.com/super-css-super-challenge/
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http://www.flickr.com/photos/wolfgangstaudt/2252688630/
http://www.flickr.com/photos/webel/347801397/
http://web.archive.org/web/20051111095409/http://wrgis.wr.usgs.gov/dds/dds-39/album.html
Photos
Type
Gotham font family by Hoefler & Frere-Jones
Other Excellent Relevant Links
http://www.merttol.com/articles/web/code/introduction-to-css-escape-sequences.html
http://www.viget.com/inspire/css-generated-content/
http://css-tricks.com/video-screencasts/94-intro-to-pseudo-elements/
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MORE
http://css-tricks.com/9516-pseudo-element-roundup/
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Thanks!
http://bit.ly/pseudos