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https://www.flickr.com/photos/h-k-d/5093579727/
Futureproof styling
(in Drupal 8)
by Tamás Hajas
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Tamás Hajas
Drupal / Web Project Manager &
Front-end Developer
Integral Vision Ltd
https://thamas.github.io
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CSS is
easy
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more than
300
.css files in Drupal 8.0.0
325
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almost
116 000
characters in CSS loaded by Drupal 8.0.0
115 894
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CSS is
easy
to do
wrong!
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body.node-19 #sidebar-first div.block .title a {
color: red !important;
}
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Ask
yourself!
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body.node-19 #sidebar-first div.block .title a {
color: red !important;
}
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@if body {
@if .node-19 {
@if #sidebar-first {
@if div {
@if .block {
@if .title {
@if a {
color: red !important;
}
}
}
}
}
}
}
Cyclomatic Complexity
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KISS
http://chamaeleontour.com/2014/02/25/kiss-forever-band-hungary-in-melle/
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Keep It Simple,
Stupid
http://chamaeleontour.com/2014/02/25/kiss-forever-band-hungary-in-melle/
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body.node-19 #sidebar-first div.block .title a {
color: red !important;
}
Are you sure, it is red, because it is in…
… .title?
… .block?
… #sidebar-first?
… body?
Context?
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body.node-19 #sidebar-first div.block .title a {
color: red !important;
}
Are you sure, it is red, because it is in…
… .title?
… .block?
… #sidebar-first?
… body?!
Context?
Seriously?!
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“Basically,
cosmetics should
not change
depending on the
location of the
component.”
–Harry Roberts
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#sidebar-first div.block .title a {
color: #fff;
}
Undoing things :(
body.node-19 #sidebar-first div.block .title a {
color: red !important;
}
div.block .title a {
color: #333;
}
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Specificity :(
body.node-19 #sidebar-first div.block .title a {
color: red !important;
}
0001 0001 0001
0010 0010
0010 0100
0,1,3,3
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Specificity :(
1,2,12,15
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Keep specificity low!
https://www.flickr.com/photos/freetheimage/14741164059
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KISS
Context?
Specificity
OK, but…
How?!
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Flat selectors
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body.node-19 #sidebar-first div.block .title a {
color: red !important;
}
.promo-title {
color: $color-brand;
}
Flat selectors
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Object vs. Component
Concrete
Abstract
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…
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Object…
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Component…
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.o-media {
display: table;
width: 100%;
}
.c-testimonial {
padding: $base-spacing-unit;
border-radius: $base-radius;
background-color: $color-shadow;
color: $color-text;
}
Object vs. Component
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“Namespaces”…
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Single responsibility principle
.button-login {
display: inline-block;
padding: 2em;
background-color: $color-brand-sec;
color: $color-text--inverse;
}
Mixing responsibilities
Base
Structural
Cosmetic
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Single responsibility principle
.button {
display: inline-block;
}
.button--large {
padding: 2em;
}
.button--positive {
background-color: $color-brand-sec;
color: $color-text--inverse;
}
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.o-media {
display: table;
width: 100%;
}
.c-testimonial {
padding: $base-spacing-unit;
border-radius: $base-radius;
background-color: $color-shadow;
color: $color-text;
}
Object vs. Component
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DRY
http://vicvapor.com/cracked-desert-background
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Don’t Repeat Yourself!
$spacing-unit: 20px;
.u-margin-top { margin-top: $spacing-unit * 1.5; }
.u-margin-right { margin-right: $spacing-unit ; }
.u-margin-bottom { margin-bottom: $spacing-unit / 2; }
.u-margin-left { margin-left: $spacing-unit; }
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Open / Closed principle
for extension for modification
.button {
…
padding: 1em 2em;
}
#sidebar .button {
padding: 1.5em 2.5em;
}
It is modified
by “context”
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Open / Closed principle
for extension for modification
.button {
…
padding: 1em 2em;
}
.button--large {
padding: 1.5em 2.5em;
}
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Classicists?!
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body.node-19 #sidebar-first div.block .title a {
color: red !important;
}
Is this better?
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Wait! It’s Drupal!
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No! It’s Drupal 8!
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• Forgot Classy! Use Stable!
• Forgot about Drupal!
• Use a Styleguide!
Think!
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Templates
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You can use Sass
mixins and extends*
* if it is needed
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CSS Structure
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by Harry Roberts
Invented Triangle CSS
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Settings
Tools
Generic
Base
Objects
Components
Utils
generic
explicit
far-reaching
localized
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There is NO
One Right Way!
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There is NO
One Right Way!
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1. Think & Decide
2. Communicate
3. Use strict
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Communicate
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Who do you work with?
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No content
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Team
You always work
in a
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Team » Communication
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Coding Standards
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Drupal CSS
Coding Standards
https://www.drupal.org/
node/1886770
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Harry Roberts
CSS Guidelines
http://cssguidelin.es
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Hugo Giraudel
Sass Guidelines
http://sass-guidelin.es
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Comment
your code!
https://www.flickr.com/photos/rushen/16071372313
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Team » Communication
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“code should be
self-documenting”
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/**
* Grid container
* Must only contain '.cell' children.
*/
.grid {
height: 100%;
font-size: 0;
white-space: nowrap;
}
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/**
* Grid container
* Must only contain '.cell' children.
*/
.grid {
height: 100%;
/* Remove inter-cell whitespace */
font-size: 0;
/* Prevent inline-block cells wrapping */
white-space: nowrap;
}
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/**
* Grid container
* Must only contain '.cell' children.
* 1. Remove inter cell whitespace.
* 2. Prevent inline-block cells wrapping
*/
.grid {
height: 100%;
font-size: 0; /* 1 */
white-space: nowrap; /* 2 */
}
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“Don’t make
me think!”
https://www.flickr.com/photos/mugley/2594318333
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Use strict
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Be consistent!
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Lint!
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1. Think & Decide
2. Communicate
3. Use strict
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Credits This presentation…
…is based on the works of
Harry Roberts.
@see http://csswizardry.com
…is influenced by the talk
“Pains in CSS” by
Anikó Fejes.
@see http://slides.com/anikofejes/
css-programozoknak-4
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Tamás Hajas
Drupal / Web Project Manager
Front-end Developer
thamas.github.io