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Reusable
CSS
CSS VARIABLES, CSS MODULES & THE FUTURE OF
@glenmaddern
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HELLO
BUDAPEST!
♥
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Reusable
CSS
CSS VARIABLES, CSS MODULES & THE FUTURE OF
@glenmaddern
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No content
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WHY IS IT
SO HARD
TO SHARE CSS?
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WHY IS IT
SO HARD
TO REUSE CSS?
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import something from 'somewhere'
something.leftPad()
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THE HUMAN BRAIN IS A
(IN)CONSISTENCY-DETECTING
MACHINE
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http://semantic-ui.com
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http://semantic-ui.com
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http://semantic-ui.com
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http://www.novolume.co.uk/blog/all-websites-look-the-same/
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http://graphicriver.net/
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WE DON'T NEED MORE TOOLING TO MAKE
OUR CURRENT COMPONENTS THEMEABLE
WE NEED TO START BUILDING
BETTER COMPONENTS
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st
ep #1
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RESPONSIVE COMPONENTS
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A COMPONENT SHOULD
RESPOND TO ITS ENVIRONMENT
• •
RATHER THAN THE ENVIRONMENT
OVERRIDING THE COMPONENT
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OUTSIDE-IN OVERRIDES
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https://en.wikipedia.org/wiki/Margaret_Hamilton_(scientist)
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http://semantic-ui.com
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MAKE YOUR COMPONENTS
LESS RESPONSIBLE
& MORE RESPONSIVE
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layout
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PADDING
CONTENT
MARGIN
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PADDING
CONTENT
MARGIN
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.component {
width: 50%;
margin-top: 2rem;
flex-grow: 1;
}
❌
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.parent {
display: flex;
padding: 1rem;
}
.parent > * {
flex-grow: 1;
}
ONE
ONE TWO
ONE TWO THREE
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.parent {
display: flex;
padding: 1rem;
}
.parent > * {
flex-grow: 1;
}
.parent > * + * {
margin-left: 1rem;
}
ONE
ONE TWO
ONE TWO THREE
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.parent {
display: flex;
padding: 1rem;
}
.parent > * {
flex-grow: 1;
}
.parent > * + * {
margin-left: 1rem;
}
.parent > :first-child {
flex: 0 0 50%;
}
ONE TWO
ONE TWO THREE
ONE TWO THREE FOUR
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LAYOUT IS THE CONCERN OF THE
p
arent
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DEMO: CURRENTCOLOR
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https://www.youtube.com/watch?v=jPOBVaomzLE
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css
v
ari
able
s
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http://caniuse.com/#feat=css-variables
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CSS CUSTOM PROPERTIES
CSS VARIABLES
=
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.component {
--size: 2rem;
width: calc(2 * var(--size));
height: var(--size);
}
.component
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.component {
--size: var(--spacing, 2rem);
width: calc(2 * var(--size));
height: var(--size);
}
.component
.container
.component
.container {
--spacing: 1rem;
}
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.component {
--size: var(--spacing, 2rem);
width: calc(2 * var(--size));
height: var(--size);
}
.component .component.large
.large {
--spacing: 4rem;
/* or */
--size: 4rem;
}
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.component {
background: var(--bg, black);
color: var(--fg, white);
}
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.component {
background: var(--bg, black);
color: var(--fg, white);
}
(bg, fg) =>
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DEMO: INVERTED BUTTON
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INHERITANCE
THE CASCADE
vs
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st
ep #2
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EXPLICIT COMPONENTS
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http://semantic-ui.com/elements/button.html
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http://jxnblk.com/rebass/#Button
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DEMO: DOCUMENTATION
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NAMING MISMATCHES?
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.container
.container {
--grid-size: 1rem;
}
.component
.component
.component {
--size: var(--spacing, 2rem);
width: calc(2 * var(--size));
height: var(--size);
}
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.component
.container
.component.fix
.container {
--grid-size: 1rem;
}
.fix {
--spacing: var(--grid-size);
}
.component {
--size: var(--spacing, 2rem);
width: calc(2 * var(--size));
height: var(--size);
}
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st
ep #3
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RESILIENT COMPONENTS
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w
arning:
re
act
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import styles from './MediaObject.css'
const MediaObject = ({ title, image, text }) => (
)
{ title }
{ text }
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import styles from './MediaObject.css'
const MediaObject = ({ title, image, text, theme=styles }) =>(
)
https://github.com/css-modules/css-modules/issues/147
{ title }
{ text }
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DEMO: INTERNAL STRUCTURE DOCS
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✅ RESPOND TO ENVIRONMENT
✅ USE INTERNAL VARIABLES
✅ EXPOSE INTERNAL STRUCTURE
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t
hank you!
@glenmaddern