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Houdini – Demystifying CSS Surma @DasSurma

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Houdini “Maybe The Most Exciting Development in CSS” bit.ly/smashingmag-houdini

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bit.ly/surma-houdini

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Houdini sounds like the best thing since sliced bread

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History

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someDiv.createShadowRoot(); customElements.define("my-element", class MyElement extends HTMLElement { // ... } ); Shadow DOM Custom Elements

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Shadow DOM Where do these come from?!

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extensiblewebmanifesto.org

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extensiblewebmanifesto.org “The web platform should expose low-level capabilities that explain existing features [...] allowing authors to understand and replicate them.”

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Houdini

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Houdini

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Houdini

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Houdini

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$('#element').style.transform = 'translate(' + this.width + ‘px,' + (this.height + 20) + 'px)'; ES5

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$('#element').style.transform = `translate(${this.width}px,${this.height + 20}px)`; ES2015

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Typed Object Model

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Typed Object Model $('#element').styleMap .set('opacity', new CSSNumberValue(0.5)); $('#element').styleMap .set('height', new CSSSimpleLength(50, 'px')); Experimental

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Typed Object Model $('#element').styleMap .set('height', new CSSSimpleLength(50, 'px')); $('#element').styleMap .get('height').value; // 50 $('#element').styleMap .get('height').type; // ‘px’ Experimental

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Typed Object Model $('#element').styleMap .set('height', new CSSCalcLength('50vh - 20px')); $('#element').styleMap.get('height').vh; // 50 $('#element').styleMap.get('height').px; // -20 Experimental

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Typed Object Model $('#element').styleMap .set("height", new CSSCalcLength({ vh: 50, px: -20, })); Experimental

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Typed Object Model const h = new CSSSimpleLength(50, 'vh') .subtract(new CSSSimpleLength(20, ‘px')); $('#element').styleMap.set('height', h); Experimental

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Typed Object Model const h = new CSSSimpleLength(50, 'vh') .subtract(new CSSSimpleLength(20, ‘px')); $('#element').styleMap.set('height', h); // h == calc(50vh - 20px); Experimental

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bit.ly/houdini-typed-om-types

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Refreshing!

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Houdini

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Custom Properties :root { --main-color: #444; --accent-color: #c00; } body h1 { color: var(--main-color); } Strings! String replacement!

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--width: 50px;

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--width: 250px;

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Custom Properties .drawer { transition: --width 1s ease-in-out; --width: 50px; width: var(--width); } .drawer.open { --width: 250px; } X

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Properties & Values

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Properties & Values registerProperty({ name: '--my-color', syntax: '', inherits: true, initialValue: 'red' }); Experimental

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Houdini

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Do you even will-change? Paul Lewis @aerotwist

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bit.ly/best-effort-scroll position: static;

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bit.ly/best-effort-scroll position: static; position: fixed; + JS transform

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Compositor Worklet

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Compositor Worklet

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Compositor Worklet

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Compositor Worklet

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Compositor Worklet

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Compositor Worklet window.compositorWorklet.import('compworklet.js') .then(function() { var animator = new CompositorAnimator('social-header'); animator.postMessage([ new CompositorProxy($('window'), ['scrollTop']), new CompositorProxy($('.avatar'), ['transform']), new CompositorProxy($('.bar'), ['transform', 'opacity']) ]); }); Experimental

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Compositor Worklet window.compositorWorklet.import('compworklet.js') .then(function() { var animator = new CompositorAnimator('social-header'); animator.postMessage([ new CompositorProxy($('window'), ['scrollTop']), new CompositorProxy($('.avatar'), ['transform']), new CompositorProxy($('.bar'), ['transform', 'opacity']) ]); }); Experimental

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Compositor Worklet class SocialHeader { onmessage(e) { this.initialized = true; this.scroller = e.data[0]; this.avatar = e.data[1]; this.bar = e.data[2]; }; tick() { /* ... */ } } registerCompositorAnimator('social-header', SocialHeader); Experimental

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Compositor Worklet class SocialHeader { onmessage(e) { this.initialized = true; this.scroller = e.data[0]; this.avatar = e.data[1]; this.bar = e.data[2]; }; tick() { /* ... */ } } registerCompositorAnimator('social-header', SocialHeader); Experimental

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Compositor Worklet class SocialHeader { onmessage(e) { this.initialized = true; this.scroller = e.data[0]; this.avatar = e.data[1]; this.bar = e.data[2]; }; tick() { /* ... */ } } registerCompositorAnimator('social-header', SocialHeader); Experimental

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Compositor Worklet class SocialHeader { onmessage(e) { this.initialized = true; this.scroller = e.data[0]; this.avatar = e.data[1]; this.bar = e.data[2]; }; tick() { /* ... */ } } registerCompositorAnimator('social-header', SocialHeader); Experimental

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Compositor Worklet class SocialHeader { onmessage(e) { this.initialized = true; this.scroller = e.data[0]; this.avatar = e.data[1]; this.bar = e.data[2]; }; tick() { /* ... */ } } registerCompositorAnimator('social-header', SocialHeader); Experimental

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Compositor Worklet window.compositorWorklet.import('compworklet.js') .then(function() { var animator = new CompositorAnimator('social-header'); animator.postMessage([ new CompositorProxy($('window'), ['scrollTop']), new CompositorProxy($('.avatar'), ['transform']), new CompositorProxy($('.bar'), ['transform', 'opacity']) ]); }); Experimental

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Compositor Worklet window.compositorWorklet.import('compworklet.js') .then(function() { var animator = new CompositorAnimator('social-header'); animator.postMessage([ new CompositorProxy($('window'), ['scrollTop']), new CompositorProxy($('.avatar'), ['transform']), new CompositorProxy($('.bar'), ['transform', 'opacity']) ]); }); Experimental

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Compositor Worklet window.compositorWorklet.import('compworklet.js') .then(function() { var animator = new CompositorAnimator('social-header'); animator.postMessage([ new CompositorProxy($('window'), ['scrollTop']), new CompositorProxy($('.avatar'), ['transform']), new CompositorProxy($('.bar'), ['transform', 'opacity']) ]); }); Experimental

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Compositor Worklet window.compositorWorklet.import('compworklet.js') .then(function() { var animator = new CompositorAnimator('social-header'); animator.postMessage([ new CompositorProxy($('window'), ['scrollTop']), new CompositorProxy($('.avatar'), ['transform']), new CompositorProxy($('.bar'), ['transform', 'opacity']) ]); }); Experimental

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Houdini

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Paint Worklet

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Paint Worklet
#myElement { --image: url('#someUrlWhichIsLoading'); background-image: paint(image-with-placeholder); } Experimental

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Paint Worklet document.registerProperty({ name: '--image', syntax: '<image>' }); window.paintWorklet.import('paintworklet.js'); Experimental

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Paint Worklet registerPaint('image-with-placeholder', class { static get inputProperties() { return ['--image']; } paint(ctx, geom, properties) { // ... } }); Experimental

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Paint Worklet paint(ctx, geom, properties) { const img = properties.get('--image'); switch (img.state) { case 'ready': ctx.drawImage(img, 0, 0, geom.width, geom.height); break; case 'pending': drawMountains(ctx); break; case 'invalid': default: drawSadFace(ctx); } } Experimental

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Houdini

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Layout ?

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gridstylesheets.org

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Font Metrics ?

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Parser ?

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Soon (tm) Paint API Typed OM Compositor Worklet

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developers.google.com/web/updates

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Ian Kilpatrick @bfgeek Chrome Engineer & Houdini Lead Surma @DasSurma Surma

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extensiblewebmanifesto.org

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Surma @DasSurma