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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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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 }) =>(

{ title }

{ text }

) https://github.com/css-modules/css-modules/issues/147

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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