What NOT to do in CSS
Sergio Behrends
VPE @ Aerolab
@Blunk sbehrends
#cssconfar
CSS
1994 Proposal
window.foreground = black
font.family = times
font.size = 12pt # alternative units are px, mm, cm
font.slant = normal
font.weight = normal
h1.font.size = font.size * 3
h2.font.size = font.size * 2.5
h3.font.size = font.size * 2
Håkon W Lie
Selectors
h1 {
}
Properties
h1 {
color: #503EEF;
text-transform: uppercase;
}
💣
h1 {
color: #503EEF;
text-transform: uppercase;
}
#nav ul li {
float: left;
}
.dontUPPER {
text-transform: none !important;
}
.red {
color: red;
}
header li.red.otherRed {
color: #CD1203;
}
.hide {
display: none !important;
}
.no-padding {
padding: 0 !important;
}
Communication
Product Owners
Designers️
Developers
♥️
Understanding Structure
Target Browsers
Devices & Resolutions
Browsers
Resolutions
Dynamic
Mobile First 📱
.btn {
/* Mobile */
...
@media screen and (min-width: 320px) {
/* Tablet */
...
}
@media screen and (min-width: 768px) {
/* Desktop */
...
}
}
.btn {
}
Structure
styles.scss
@import "vars";
@import "btn";
_vars.scss
$purple: #503EEF;
$btn-size: 40px;
_btn.scss
.btn {
font-size: $btn-size/2;
border-radius: $btn-size;
line-height: $btn-size;
&.btn-purple {
border: 3px solid $purple;
color: $purple;
}
}
├── fonts
│ └── ...
├── images
│ └── ...
└── styles
├── base
│ ├── _base.scss
│ ├── _fonts.scss
│ ├── _text.scss
│ └── _vars.scss
├── layout
│ ├── _footer.scss
│ ├── _header.scss
│ └── ...
├── styles.scss
├── modules
│ ├── _btn.scss
│ └── ...
└── util
└── mixins.scss
Rule your project
"C" for Cascade
👀
header.main-header nav > ul > li > ul > li a {
text-decoration: none;
}
Selectors & Naming
SMACSS
BEM
OOCSS
Tooling Helps
Important
Don't use !important
#AVOIDUSINGIDS
Think in Modules
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Related Articles
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London is a treasure trove of brilliant activities and days out worth boasting about. We're completely spoilt for choice with things to do in London, whether you live and work in the capital or you’re planning a holiday, there's loads of ways to fill a free day with fun.
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Notre Dame and the Eiffel Tower have been described countless times, as have the Seine and the subtle (and not-so-subtle) differences between the Left and Right Banks.
Top things to do in London
London is a treasure trove of brilliant activities and days out worth boasting about. We're completely spoilt for choice with things to do in London, whether you live and work in the capital or you’re planning a holiday, there's loads of ways to fill a free day with fun.
Top things to do in London
London is a treasure trove of brilliant activities and days out worth boasting about. We're completely spoilt for choice with things to do in London, whether you live and work in the capital or you’re planning a holiday, there's loads of ways to fill a free day with fun.
/* _card.scss */
.card {
...
img {
...
}
h3 {
...
}
.content {
...
}
}
/* _related.scss */
.related {
.card {
...
}
}
Top things to do in London
London is a treasure trove of brilliant activities and days out worth boasting about. We're completely spoilt for choice with things to do in London, whether you live and work in the capital or you’re planning a holiday, there's loads of ways to fill a free day with fun.
Top things to do in London
London is a treasure trove of brilliant activities and days out worth boasting about. We're completely spoilt for choice with things to do in London, whether you live and work in the capital or you’re planning a holiday, there's loads of ways to fill a free day with fun.
/* _card.scss */
.card {
...
.related & {
...
}
}
.card-image {
...
}
.card-title {
...
}
.card-content {
...
}
Learn from your code
Peer Review
Got Hacks?
.animation {
/* Little hack for better rendering */
transform: translateZ(0);
}
/* Fixes strange issue with image sizing in IE */
_:-ms-fullscreen, :root .content image {
min-height: 100%;
}
Thank you!
☕ ||️ 🍺
@Blunk sbehrends