Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
The ABCs of CSS You've Likely Never Used
Search
Alicia Sedlock
August 08, 2017
Technology
0
63
The ABCs of CSS You've Likely Never Used
That Conference 2017
Alicia Sedlock
August 08, 2017
Tweet
Share
More Decks by Alicia Sedlock
See All by Alicia Sedlock
How To Fights and Prevent Burnout
aliciasedlock
2
20k
The State of Front-End Testing
aliciasedlock
2
560
The Landscape of Front-End Testing
aliciasedlock
3
1.3k
You Can Make Games
aliciasedlock
1
140
Jumping Into Front-End Testing
aliciasedlock
3
170
Let's Get Testable: An Introduction to Unit Testing
aliciasedlock
4
840
Other Decks in Technology
See All in Technology
スマートファクトリーの第一歩 〜AWSマネージドサービスで 実現する予知保全と生成AI活用まで
ganota
2
250
開発者を支える Internal Developer Portal のイマとコレカラ / To-day and To-morrow of Internal Developer Portals: Supporting Developers
aoto
PRO
1
470
Oracle Base Database Service 技術詳細
oracle4engineer
PRO
10
75k
はじめてのOSS開発からみえたGo言語の強み
shibukazu
1
720
サラリーマンの小遣いで作るtoCサービス - Cloudflare Workersでスケールする開発戦略
shinaps
2
460
dbt開発 with Claude Codeのためのガードレール設計
10xinc
2
1.3k
Django's GeneratedField by example - DjangoCon US 2025
pauloxnet
0
150
品質視点から考える組織デザイン/Organizational Design from Quality
mii3king
0
210
Android Audio: Beyond Winning On It
atsushieno
0
2.1k
AIエージェント開発用SDKとローカルLLMをLINE Botと組み合わせてみた / LINEを使ったLT大会 #14
you
PRO
0
130
複数サービスを支えるマルチテナント型Batch MLプラットフォーム
lycorptech_jp
PRO
1
730
RSCの時代にReactとフレームワークの境界を探る
uhyo
10
3.5k
Featured
See All Featured
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
113
20k
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
46
7.6k
Thoughts on Productivity
jonyablonski
70
4.8k
jQuery: Nuts, Bolts and Bling
dougneiner
64
7.9k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
12
1.1k
Fantastic passwords and where to find them - at NoRuKo
philnash
52
3.4k
A better future with KSS
kneath
239
17k
Typedesign – Prime Four
hannesfritz
42
2.8k
The World Runs on Bad Software
bkeepers
PRO
70
11k
Building a Scalable Design System with Sketch
lauravandoore
462
33k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
32
1.6k
Put a Button on it: Removing Barriers to Going Fast.
kastner
60
4k
Transcript
The ABCs of CSS Properties You’ve Likely Never Used (Well,
Mostly!) Alicia Sedlock | @aliciability
Hi!
None
What’s your favorite CSS property or module?
None
There’s a lot of CSS I don't know.
A additive-symbols “… specify symbols when the value of a
counter system descriptor is additive.”
@counter-style custom-counter { system: additive; additive-symbol: I 1; } .list
{ list-style: custom-counter; }
@counter-style custom-counter { system: additive; additive-symbol: “>” 3; } .list
{ list-style: customer-counter; }
@counter-style custom-counter { system: additive; additive-symbol: “X” 10, “V” 5,
“I” 1; }
B ::backdrop “…is a box rendered immediately below any
element rendered in fullscreen mode.”
dialog { /* some dialog styles */ } dialog::backdrop {
background: black; opacity: .5; }
None
C caret-color “…sets the color of the caret in
an element.”
input.custom { caret-color: red; }
None
D :default “…represents any user interface element that is
the default among a group of similar elements.”
:default { background-color: pink; } <form> <input type=“button” value=“Button” />
<input type=“submit” /> <input type=“reset” /> </form>
None
E :empty “ ..any element that has no children
at all.”
div { background: lightblue; } div:empty {
background: pink; } <div><!— No content —></div> <div>Hello world!</div> <div> <!— No content —> </div>
None
F ::first-letter “…applies styles to the first letter of
the first line of a block-level element…”
p::first-letter { color: red; font-size: 3em; font-weight: bold;
} <p>The quick brown fox</p>
p::first-letter { color: red; font-size: 3em; font-weight: bold;
} <p> <img src=“fox.jpg” /> The quick brown fox </p>
G grayscale()
.fox1 { filter: grayscale(.95); } .fox2 { filter: grayscale(.55); }
.fox3 { filter: grayscale(.15); }
H hyphens “…how words should be hyphenated when text
wraps across multiple lines.”
<p>That Conference is extreme­ly rad!</p> p { hyphens: none; width:
55px; }
<p>That Conference is extreme­ly rad!</p> p { hyphens: manual; width:
55px; }
<p>That Conference is extreme­ly rad!</p> p { hyphens: auto; width:
55px; }
I :in-range “…matches when the value currently contained inside
an <input> element is inside the range limits specified by the min and max attributes.”
None
<label>Enter a number 1-10</label> <input type="number" min="1" max="10" value="12" />
input:in-range { background-color: rgba(0, 255, 0, 0.25); } input:out-of-range { background-color: rgba(255, 0, 0, 0.25); border: 2px solid red; }
None
J justify-content ONLY ENTRY “…defines how the browser distributes
space between and around content items along the main axis of their container.”
.container { display: flex; justify-content: <value>; } <div class=“container”> <div><!—
Content! —></div> <div><!— Content! —></div> <div><!— Content! —></div> </div>
.container { display: flex; justify-content: flex-start; } <div class=“container”> <div><!—
Content! —></div> <div><!— Content! —></div> <div><!— Content! —></div> </div>
.container { display: flex; justify-content: flex-end; } <div class=“container”> <div><!—
Content! —></div> <div><!— Content! —></div> <div><!— Content! —></div> </div>
.container { display: flex; justify-content: center; } <div class=“container”> <div><!—
Content! —></div> <div><!— Content! —></div> <div><!— Content! —></div> </div>
.container { display: flex; justify-content: space-around; } <div class=“container”> <div><!—
Content! —></div> <div><!— Content! —></div> <div><!— Content! —></div> </div>
.container { display: flex; justify-content: space-between; } <div class=“container”> <div><!—
Content! —></div> <div><!— Content! —></div> <div><!— Content! —></div> </div>
K khz “…represents a frequency dimension, such as the
pitch of a speaking voice.”
p.low { pitch: 105Hz; } em.high { pitch: 135Hz; }
L :lang “…matches elements based on the language the
element is determined to be in.”
<html lang=“en”></html>
<div lang=“en”>Hello, world!</div> <div lang=“fr”>Bonjour, le monde!</div> <div lang=“de”>Hallo, Welt!</div>
:lang(en) { border: 1px solid red; } :lang(fr) {
border: 1px solid blue; } :lang(de) { border: 1px solid black; }
M max-zoom “…sets the maximum zoom factor of a
document defined by the @viewport at- rule."
* { max-zoom: 150%; max-zoom: 2.0; }
N negative “…alters the representation of negative counter values,
by providing a way to specify symbols to be appended or prepended to the counter representation when the value is negative.”
<ul class="list" start="-3"> <li>One</li> <li>Two</li> <li>Three</li> <li>Four</li> <li>Five</li> </ul>
@counter-style negative-counter { system: numeric; symbols: "0" "1" "2" "3"
"4" "5" "6" "7" "8" "9"; negative: "(-" ")"; } .list { list-style: negative-counter; }
None
O object-fit “…how a replaced element, such as an
<img> or <video>, should be resized to fit its container.”
/* Base styles for examples */ img { width: 400px;
height: 500px; border: 5px solid pink; object-fit: <value>; }
None
None
None
None
None
P pointer-events “…specifies under what circumstances a particular graphic
element can become the target of mouse events.”
div { pointer-events: none; }
<div> Lorem ipsum dolor sit amet… </div> <div class="overlay"> I
am an overlay. Try selecting the text behind me. </div>
.overlay { position: absolute; top: 0; left: 40%; background: rgba(0,0,0,.75);
height: 200px; width: 250px; color: white; padding: 1em; pointer-events: auto; }
pointer-events: auto
pointer-events: none
pointer-events: visiblePainted; pointer-events: visibleFill; pointer-events: visibleStroke; pointer-events: visible; pointer-events: painted;
pointer-events: fill; pointer-events: stroke; pointer-events: all;
Q quotes “…indicates how user agents should render quotation
marks.”
<span>According to Groot, <q>I am Groot.</q>.</span> q { quotes:
"**" “**”; } q:before { content: open-quote; } q:after { content: close-quote; }
<span>Peter Quill says <q>I'm pretty sure the answer is <q>I
am Groot</q>.</q></span> q { quotes: ’””’ ‘“”’ “‘’” “‘’”; } q:before { content: open-quote; } q:after { content: close-quote; }
R revert “…rolls back the cascade so that a
property takes on the value it would have had if there were no styles in the current style origin"
None
S suffix “…specifies a symbol that will be appended
to the marker representation.”
<ul class="list"> <li>One</li> <li>Two</li> <li>Three</li> <li>Four</li> <li>Five</li> </ul>
@counter-style counter-options { system: fixed; symbols: A B C D
E F G; suffix: “) ”; } .list { list-style: counter-options; }
None
T tab-size “…used to customize the width of a
tab (U+0009) character.”
pre { tab-size: 4; /* integer values */ tab-size: 2;
tab-size: 10px; /* length values */ tab-size: 2em; }
<pre class=“default"> 	This is a line in pre! 	CSS is
a lot of fun. :) </pre> pre { border: 1px solid black; width: 500px; }
<pre class=“default"> 	This is a line in pre! 	CSS is
a lot of fun. :) </pre> pre { border: 1px solid black; width: 500px; tab-size: 4; }
<pre class=“default"> 	This is a line in pre! 	CSS is
a lot of fun. :) </pre> pre { border: 1px solid black; width: 500px; tab-size: 100px; }
U unset “…resets a property to its inherited value
if it inherits from its parent, and to its initial value if not.”
<p>I want to be blue text!</p> <div class="foo"> <p>I want
to be orange text :(</p> </div> <div class="bar"> <p>I don't want to be orange.</p> </div> .foo { color: orange; } .bar { color: green; } p { color: blue; } .bar p { color: unset; }
None
V vw/vh “Equal to 1% of the width/height of the
viewport's initial containing block.”
W will-change “…provides a way for authors to hint browsers
about the kind of changes to be expected on an element, so that the browser can set up appropriate optimizations ahead of time…”
div { will-change: transform; will-change: opacity; will-change: contents; /* custom-ident
*/ will-change: scroll-behavior; /* custom-ident */ }
A warning on will-change • Intended as a “last resort”
- don’t prematurely optimize • Meant to be used sparingly
X Y
* { xtreme: ‘heck-yeah’; }
* { yolo: 100; }
Z z-index “… specifies the z-order of a positioned element
and its descendants.”
What the heck do I do with this now?
Depth of CSS
Some of these things are • Experimental technology • In
working draft • In initial definition
Grid Layout Hype
P pointer-events “…specifies under what circumstances a particular graphic
element can become the target of mouse events.”
None
None
A Challenge
None
Thank you.