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
CSS, LESS, & The New UI
Search
Matthew Osborn
June 29, 2015
Technology
0
220
CSS, LESS, & The New UI
A brown bag on using CSS and LESS
Matthew Osborn
June 29, 2015
Tweet
Share
More Decks by Matthew Osborn
See All by Matthew Osborn
Palmetto - Introductory Messaging
osbornm
0
84
React: How to JavaScript Hipster
osbornm
0
160
UX / UI - Lunch & Learn
osbornm
0
290
Practical Knockout
osbornm
0
170
AMD with RequireJS
osbornm
0
140
3D Printing Introduction
osbornm
0
110
Practical HTML 5
osbornm
2
470
Playr
osbornm
1
730
NuGet: Add Reference, Awesome
osbornm
1
940
Other Decks in Technology
See All in Technology
スプリントレビューを効果的にするために
miholovesq
9
1.7k
株式会社島津製作所_研究開発(集団協業と知的生産)の現場を支える、OSS知識基盤システムの導入
akahane92
1
1.3k
robocopy の怖い話/scary-story-about-robocopy
emiki
0
400
LLMでAI-OCR、実際どうなの? / llm_ai_ocr_layerx_bet_ai_day_lt
sbrf248
0
130
ObsidianをLLM時代のナレッジベースに! クリッピング→Markdown→CLI連携の実践
srvhat09
7
9.8k
[MIRU2025]Preference Optimization for Multimodal Large Language Models for Image Captioning Tasks
keio_smilab
PRO
0
100
Power Automate のパフォーマンス改善レシピ / Power Automate Performance Improvement Recipes
karamem0
0
270
AWS表彰プログラムとキャリアについて
naoki_0531
1
140
Snowflake のアーキテクチャは本当に筋がよかったのか / Data Engineering Study #30
indigo13love
0
280
LLM開発を支えるエヌビディアの生成AIエコシステム
acceleratedmu3n
0
340
2025/07/22_家族アルバム みてねのCRE における生成AI活用事例
masartz
2
140
Kiroから考える AIコーディングツールの潮流
s4yuba
1
340
Featured
See All Featured
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
34
5.9k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
181
54k
Imperfection Machines: The Place of Print at Facebook
scottboms
267
13k
Building a Modern Day E-commerce SEO Strategy
aleyda
42
7.4k
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
44
2.4k
Six Lessons from altMBA
skipperchong
28
3.9k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Building Applications with DynamoDB
mza
95
6.5k
Measuring & Analyzing Core Web Vitals
bluesmoon
7
530
[RailsConf 2023] Rails as a piece of cake
palkan
55
5.7k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
283
13k
Learning to Love Humans: Emotional Interface Design
aarron
273
40k
Transcript
CSS, LESS, & THE NEW UI PART I
BOX MODEL
ELEMENTS INLINE BLOCK
ELEMENTS SPAN H[1-‐6] DIV A ARTI CLE SECTION P
I HEADE R BUTTON NAV INPUT STRONG OL CODE UL FORM PRE DD TABLE LI
ELEMENTS SPAN H[1-‐6] DIV A ARTI CLE SECTION P
I HEADE R BUTTON NAV INPUT STRONG OL CODE UL FORM PRE DD TABLE LI
ELEMENTS SPAN H[1-‐6] DIV A ARTI CLE SECTION P
I HEADE R BUTTON NAV INPUT STRONG OL CODE UL FORM PRE DD TABLE LI
SELECTORS ELEMENT CLASS ID ATTRIBUTE PSEUDO-‐CLASS
HIERARCHY
ELEMENT P { background-‐color: #ebebeb; margin: 10px 0
10px 0; } div, Section { background: #fff; padding: 10px 0; } Article { padding: 10px; }
CLASS .foo { background-‐color: #ebebeb; margin: 10px 0
10px 0; } div.foo { background: #fff; padding: 10px 0; } .foo.bar { padding: 10px; }
ID #foo { background-‐color: #ebebeb; margin: 10px 0
10px 0; } div#foo { background: #fff; padding: 10px 0; } #foo.bar { padding: 10px; }
HIERARCHY div .foo { background-‐color: #ebebeb; margin: 10px
0 10px 0; } div > foo { background: #fff; padding: 10px 0; } #foo + .bar { padding: 10px; }
ATTRIBUTE div[required] { background-‐color: #ebebeb; margin: 10px 0
10px 0; } #foo[placeholder=‘bar’] { background: #fff; padding: 10px 0; } .foo[placeholder~=‘bar’] { padding: 10px; }
PSEUDO CLASS div:hover { background-‐color: #ebebeb; margin: 10px
0 10px 0; } #foo:visited { background: #fff; padding: 10px 0; } .foo:last-‐child { padding: 10px; }
SPECIFICITY STYLE ATTRIBUTE ID CLASS, PSEUDO,
ATTRIBUTE ELEMENT MOST LEAST
s impler emantic maller s s
<style> .rounded {
padding: 10px; position: relative; } .rounded-‐top-‐left, .rounded-‐top-‐right, .rounded-‐bottom-‐left, .rounded-‐bottom-‐right { height: 10px; position: absolute; width: 10px; } .rounded-‐top-‐left { background-‐image: url(../images/topleft.gif); left: 0; top: 0; } .rounded-‐top-‐right { background-‐image: url(../images/topright.gif); right: 0; top: 0; } .rounded-‐bottom-‐left { background-‐image: url(../images/bottomleft.gif); bottom: 0; left: 0; } .rounded-‐bottom-‐left { background-‐image: url(../images/bottomright.gif); bottom: 0; left: 0; } </style> <div> <div class="rounded-‐top-‐left"></div> <div class="rounded-‐top-‐right"></div> <p>Rounded Corners</p> <div class="rounded-‐bottom-‐left"></div> <div class="rounded-‐bottom-‐right"></div> </div> <style> .rounded { border-‐radius: 10px; } </style> <p class="rounded"> Rounded corners </p> 47 lines 9 lines
<script> $(function () { $("input[type=text]").each(function
() { $(this).val(this.title); $(this).addClass("placeholder"); }); $("input[type=text]").focus(function () { if ($(this).val() === this.title) { $(this).val = ""; $(this).removeClass("placeholder"); } }); $("input[type=text]").blur(function () { if ($(this).val() === "") { $(this).val(this.title); $(this).addClass("placeholder"); } }); }); </script> <form action="/stuff" method="post"> <input type="text" name="value" title="Value" /> <input type="submit" value="Submit" /> </form> <form action="/stuff" method="post"> <input type="text" name="value" placeholder="Value" /> <input type="submit" value="Submit" /> </form> 1 path 5 paths
<div class="header"> <div id="nav">
<ul> <li><a href="#">Link</a></li> <li><a href="#">Link</a></li> <li><a href="#">Link</a></li> </ul> </div> </div> <div class="page-‐body"> <div class="post"> <p>Some Content</p> </div> <div id="ads">Ad</div> </div> <div id="footer"> © </div>
<header> <nav> <ul>
<li><a href="#">Link</a></li> <li><a href="#">Link</a></li> <li><a href="#">Link</a></li> </ul> </nav> </header> <section> <article> <p>Some Content</p> </article> <aside>Ad</aside> </section> <footer> © </footer> fixed
COMP > CODE REVIEW ALL THE COMPS WRITE THE
HTML WRITE THE STYLES
COMP > CODE LOOK AT ALL STATES LOOK FOR
COMMOM BITS LOOK TRANSITIONS
COMP > CODE PRESEVRE RELATIONSHIPS LESS IS MORE
VIEW WITH NO STYLING
COMP > CODE LESS IS MORE AS VAGUE AS
POSSIBLE
HANDS ON LAB
CSS, LESS, & THE NEW UI PART II
HANDS ON LAB
SPECIFICITY STYLE ATTRIBUTE ID CLASS, PSEUDO,
ATTRIBUTE ELEMENT MOST LEAST
SPECIFICITY STYLE ATTRIBUTE ID CLASS, PSEUDO,
ATTRIBUTE ELEMENT UL
SPECIFICITY STYLE ATTRIBUTE ID CLASS, PSEUDO,
ATTRIBUTE ELEMENT UL 1
SPECIFICITY 0001 1 UL
SPECIFICITY STYLE ATTRIBUTE ID CLASS, PSEUDO,
ATTRIBUTE ELEMENT .foo
SPECIFICITY STYLE ATTRIBUTE ID CLASS, PSEUDO,
ATTRIBUTE ELEMENT .foo 1
SPECIFICITY 0010 1 .foo
SPECIFICITY STYLE ATTRIBUTE ID CLASS, PSEUDO,
ATTRIBUTE ELEMENT ul#foo
SPECIFICITY STYLE ATTRIBUTE ID CLASS, PSEUDO,
ATTRIBUTE ELEMENT ul#foo 1 1
SPECIFICITY 0101 1 ul#foo 1
SPECIFICITY body div ul#foo li.bar ul#foo li#baz
SPECIFICITY body div ul#foo li.bar ul#foo li#baz
114 212
SPEED ID CLASS TAG UNIVERSAL FAST
SLOW
SPEED #main-‐navigaRon body.home #page-‐wrap
.main-‐navigaRon ul li a.current ul ul li a * #content [Rtle='home'] ID ID Class Class Tag Tag Universal Universal
SPEED RIGHT TO LEFT
SPEED #main-‐nav > li
SPEED #main-‐nav > li ALL li ELEMENTS DECENDENTS
OF #main-‐nav
SPEED #foo #bar ul#baz a
SPEED #foo #bar ul#baz a EXTREMELY SLOW COULD
BE HARD TO OVERRIDE
FLOAT & POSITION
FLOAT float: right;
POSITION top: 0; right: 0;
FLOAT VS POSITION
FLOAT
POSITION
LESS SYNTAX VARIBLES FUNCTIONS MIXINS CALCULATIONS
NESTING IMPORTS
LESS SYNTAX /* NESTING */ #header {
color: red; a { text-‐decoration: none; } } /* GENERATED CSS */ #header { color: red; } #header a { text-‐decoration: none; }
LESS SYNTAX /* NESTING CONT’N */ #header {
a { text-‐decoration: none; &:hover { color: blue; } } } /* GENERATED CSS */ #header a { text-‐decoration: none; } #header a:hover { color: blue; }
LESS SYNTAX /* VARIBLES */ @nice-‐blue: #5B83AD;
@light-‐blue: @nice-‐blue + #111; #header { color: @light-‐blue; } /* GENERATED CSS */ #header { color: #6c94be; }
LESS SYNTAX /* FUNCTIONS */ .box-‐shadow(@style, @c) when
(iscolor(@c)) { -‐webkit-‐box-‐shadow: @style @c; -‐moz-‐box-‐shadow: @style @c; box-‐shadow: @style @c; } #header { .box-‐shadow(0 0 0 5px, #000); } /* GENERATED CSS */ #header { -‐webkit-‐box-‐shadow: 0 0 0 5px #000000; -‐moz-‐box-‐shadow: 0 0 0 5px #000000; box-‐shadow: 0 0 0 5px #000000; }
LESS SYNTAX /* IMPORTS */ @import “foo.less”
@import “bar.css” @import “baz.cshtml” /* COMMENT */ * CSS is also valid less * Depending on conversion client can request and file that returns valid less.
LESS SYNTAX lesscss.org less2css.org
HANDS ON LAB