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CSS Modules ReactJS &

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GIORGIO POLVARA @GPX WEB DEVELOPER

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CSS

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HTML CSS &

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HTML CSS &

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HTML CSS &

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HTML

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HTML 1993

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HTML 1993

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HTML 1993

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HTML 1993

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HTML 1993

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HTML 1993 1996

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HTML CSS 1993 1996

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HTML CSS &

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CSS

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CSS TINY LANGUAGE

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CSS

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CSS CSS

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CSS CSS CSS

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CSS

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IT HAS FLAWS CSS

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IT HAS FLAWS

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NO VARIABLES

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:root { --bg-cl: blue; } .one { background-color: var(--bg-cl); } NO VARIABLES

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$bg-cl: blue; .one { background-color: $bg-cl; } :root { --bg-cl: blue; } .one { background-color: var(--bg-cl); } NO VARIABLES

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NO VARIABLES NO FUNCTIONS

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button:active { color: invert($btn-cl); } button { @include button(); } NO VARIABLES NO FUNCTIONS

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button { display: -webkit-box; display: -ms-flexbox; display: flex; } NO VARIABLES NO FUNCTIONS VENDOR PREFIXES

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NO VARIABLES NO FUNCTIONS VENDOR PREFIXES

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NO VARIABLES NO FUNCTIONS VENDOR PREFIXES

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NO VARIABLES NO FUNCTIONS VENDOR PREFIXES SOLVED* }

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BIG ONE PROBLEM

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GLOBALS

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.label { font-size: 1.5rem; } .label { background: red; }

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.label { font-size: 1.5rem; } .label { background: red; }

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label .

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label .menu__

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label .menu__ --on

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label .menu__ --on label .form__

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label .menu__ --on label .form__ label .hero__ --hover

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label .menu__ --on label .form__ label .hero__ --hover

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INLINE STYLE THE METHOD

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Christopher Chedeau @vjeux

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.label { font-size: 1.5rem; }

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var styles = { label: { fontSize: '1.5rem' } } .label { font-size: 1.5rem; }

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var styles = { label: { fontSize: '1.5rem' } }

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var styles = { label: { fontSize: '1.5rem' } } render () { return (
) }

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var styles = { label: { fontSize: '1.5rem' } } render () { return (
) }

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var styles = { label: { fontSize: '1.5rem', ':hover': { backgroundColor: 'blue' } } }

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CSS-JS IS WEIRD

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CSS-JS IS WEIRD NO CSS TOOLS

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CSS-JS IS WEIRD NO CSS TOOLS PERFORMANCE

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PERFORMANCE

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PERFORMANCE Click Me

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PERFORMANCE Click Me

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PERFORMANCE Click Me

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PERFORMANCE onMouseOver Click Me

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PERFORMANCE onMouseOver updateStyles() Click Me

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PERFORMANCE onMouseOver updateStyles() Virtual DOM Click Me

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PERFORMANCE onMouseOver updateStyles() Virtual DOM DOM Changes Click Me

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PERFORMANCE onMouseOver updateStyles() Virtual DOM DOM Changes onMouseOut updateStyles() Virtual DOM DOM Changes

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PERFORMANCE Click Me

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PERFORMANCE Click Me Click Me Click Me Click Me Click Me Click Me Click Me Click Me Click Me

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CSS-JS IS WEIRD NO CSS TOOLS PERFORMANCE

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.label { font-size: 1.5rem; }

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.label { font-size: 1.5rem; } menu.css

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.label { font-size: 1.5rem; } render () { return (
) } menu.css menu.js

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.label { font-size: 1.5rem; } import styles from './menu.css'; render () { return (
) } menu.css menu.js

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.label { font-size: 1.5rem; } import styles from './menu.css'; render () { return (
) } menu.css menu.js

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import styles from './menu.css'; render () { return (
) }

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import styles from './menu.css'; render () { return (
) }

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.label { font-size: 1.5rem; } .label { color: #bada55; } .label { font-weight: bold; }

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.label { font-size: 1.5rem; } menu.css .label { color: #bada55; } hero.css .label { font-weight: bold; } form.css

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.label { font-size: 1.5rem; } menu.css .label { color: #bada55; } hero.css .label { font-weight: bold; } form.css .hero_label_123ab { color: #bada55; } .menu_label_456cd { font-size: 1.5rem; } .form_label_789ef { font-weight: bold; } bundle.css

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.className { color: green; background: red; } .otherClassName { composes: className; color: yellow; }

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.className { color: green; background: red; } .otherClassName { composes: className; color: yellow; } .otherClassName { composes: className from "./style.css"; color: yellow; }

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:global(.my-class) > .localClass { color: red; } :global { @keyframes globalAnimation { to { color: blue; } } }

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.label { font-size: 1.5rem; }

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.label { font-size: 1.5rem; } .label:hover { color: red; }

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.label { font-size: 1.5rem; } .label:hover { color: red; } .pointer + .label { cursor: pointer; }

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.label { font-size: 1.5rem; } .label:hover { color: red; } .pointer + .label { cursor: pointer; } .item { color: $brand; &:hover { color: invert($brand); } }

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.label { font-size: 1.5rem; } .label:hover { color: red; } .pointer + .label { cursor: pointer; } .item { color: $brand; &:hover { color: invert($brand); } } .pane { display: flex; }

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CSS-JS IS WEIRD NO CSS TOOLS PERFORMANCE

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CSS-JS IS WEIRD NO CSS TOOLS PERFORMANCE

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CSS-JS IS WEIRD NO CSS TOOLS PERFORMANCE

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CSS-JS IS WEIRD NO CSS TOOLS PERFORMANCE

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GLOBALS

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GLOBALS

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Jack Franklin JavaScript Playground bit.ly/2anU8fF

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THANK YOU