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Responsive Web Applications with Container Queries

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A talk about process, not code

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Beautiful Accounting Software

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Goal: Evolve the design

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Problem: Different tech stacks

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Goal: Responsive

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Problem: Designers weren’t thinking “Responsive”

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Let’s take a step back…

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Responsive

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Device-specific 
 design and development

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A Designer saw a feature through all platforms

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Goal: 
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Monolithic app with accessible templates

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Goal: Responsive

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Ignored Mobile Web

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Limited Mobile App

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Each horizontal block is considered in the context of the viewport

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Each page can be art directed individually

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Web applications have components in multiple contexts needing to respond differently

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A single page in a web application can have dozens of variations

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With media queries, you have to know the possible interplay of all objects

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With container queries, you only have to know the interplay within a single object

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No spec for container queries

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Declare in: CSS, HTML, or 
 JavaScript

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https://github.com/ResponsiveImagesCG/cq-demos .element:media( min-width:500px ) {} https://github.com/tysonmatanich/elementQuery .element[min-width~=“500px"] { background-color: #eee; }

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http://eqcss.github.io/eqcss/ @element ".element" and 
 (min-width: 500px) { .element { background: gold; } }

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https://github.com/tysonmatanich/elementQuery .element[min-width~="400px"] { }

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To parse CSS, either need to be on same domain or set up CORS

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https://github.com/Snugug/eq.js data-eq-pts="small: 400, medium: 600, large: 900"

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At HTML level, requires consistency of implementation across app

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We chose JavaScript

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elements = [ { "module": ".flex--2x1", "className":"responsiveClass", "minWidth": 768, "maxWidth": 1024 } ]

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Due to resize debouncing, there’s a small but discernible delay in re-render

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Going Responsive meant a consistent feature set across all devices

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New features automatically have cross-device support

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Went responsive in under a month†

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Lessons Learned

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It’s not about the properties, it’s about its purpose.

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Tried to use grid classes for everything

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Had to write extra classes just to define responsive story

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Single purpose classes resulted in less edge cases (and less code!)

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Gzip minimizes duplicate properties really well

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Tables are difficult

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Avoid too much on the horizontal axis

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Product Design is a team sport

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Goal: Evolve the design

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Goal reframed: Allow anybody to make product-wide design changes quickly and easily

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Problem: Different tech stacks

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Make the right things easy and the wrong things hard

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Problem: Designers weren’t thinking “Responsive”

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Solution: 
 Education?

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Lessons Learned

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Container Queries enable faster development

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Designers should think Responsive before they need to.

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Thank you.
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