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PROGRESSIVE ENHANCEMENT IN PRACTICE

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MY NAME IS ROMAN HI, @rstrangh

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I WORK AT innoQ © Robert Glaser

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© Kristina Alexanderson https://flic.kr/p/doNnfg

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WEB DEVELOPMENT IS HARD © Sandra Fauconnier https://flic.kr/p/6RQkGZ

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THERE ARE

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WEB TECHNOLOGIES

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https://github.com/alrra/browser-logos BROWSERS

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https://github.com/alrra/browser-logos MORE BROWSERS 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2 3 3.5 3.6 4 5 6 7 8 9 10 11 12 13 14 15 16 5.5 6 7 8 9 10 11 9.5-9.6 10.0-10.1 10.5 10.6 11 11.1 11.5 11.6 12 12.1 15 16 17 18 19 20 21 22 23 24 25 3.1 3.2 4 5 5.1 6 6.1 7 7.1 8 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 + MOBILE

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© Luke Wroblewski https://flic.kr/p/gS7txD DEVICES

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© Mike Weber https://flic.kr/p/gonfmL 2.802.478.934 USERS WORLDWIDE http://www.internetworldstats.com

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DEAL WITH IT

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Progressive Enhancement

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Progressive enhancement
 is a technique to apply web technologies in layers on top of each other in such a way that all content und core functionality of a website is accessible for 
 every user.

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… once a test ensures that the user’s browser supports the respective feature, the core experience of a website can be enhanced stepwise.

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„Progressive Enhancement is a way of building websites that complements the philosophies that the web is build upon. “ –Some guy on HasGeek TV

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IN THEORY © Christian Senger https://flic.kr/p/8gdpaH

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HTML CSS JavaScript ARIA Sparse, semantic markup contains all content Stylesheets enhance design und layout Unobtrusive JavaScript enhances interaction and behavior WAI-ARIA maintains and improves accessibility

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BENEFITS

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© Jody Frost https://flic.kr/p/9JAbJN FAULTTOLERANT

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„Basically, when an elevator fails, it’s useless. When an escalator fails, it becomes stairs. We should be building escalators, not elevators.“ –Jake Archibald

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FUTURE- FRIENDLY © Jeff Eaton https://flic.kr/p/b33qWt

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„Progressive enhancement is not about dealing with old browsers, it’s about dealing with new browsers.“ –Jeremy Keith

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ACCESSIBLE © Steven Damron https://flic.kr/p/5CRJRE

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© Yahoo! Accessibility Lab https://flic.kr/p/ax2JmR

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ALSO

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FAST LINKABLE SEARCHABLE PROFITABLE © Matthew Black https://flic.kr/p/YFYnd

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BUT

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© Jacob Bøtter http://flic.kr/p/5TeTqw REQUIRES THINKING

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THERE ARE EXCEPTIONS © OSMOS by Hemisphere Games

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„Be pragmatic – not dogmatic.“ –Me, always

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IN PRACTICE © JD Hancock https://flic.kr/p/6zA7Pf

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Online  Check-­‐in https://roca-airways.herokuapp.com

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http://roca-style.org RESOURCE-ORIENTED CLIENT ARCHITECTURE

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Input name and flight number Show flight details Preselected seat Change to a different seat Complete check-in FEATURES

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CORE FUNCTIONALITY

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Use semantic markup Add ARIA landmarks Provide basic navigation (e.g. skip links) Embrace HTML5 form validation Fall back to server-side validation

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STYLING

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Basic styling should be safe Use external stylesheet(s) Provide fallbacks Add styles for states Use separate classes for enhancements Layout is optional, start mobile first

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FEATURE-DETECTION &
 INTERACTION

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Use feature-detection (e.g. Modernizr) Test for CSS and JS Features Load in additional enhancements Use JavaScript unobtrusively Provide keyboard access Set proper ARIA attributes

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© John Morgan https://flic.kr/p/9PbSNB IN DETAIL

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FEATURE DETECTION

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SVG

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WEBFONTS

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CLIENT-SIDE
 VALIDATION

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SEAT SELECTION

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TAKING IT FURTHER Offline Notifications Service Workers WebGL

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IN SUMMARY

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WORKS

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WORKS

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WORKS

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WORKS

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KTHXBYE [email protected] @rstrangh

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RESOURCES Designing with progressive enhancement
 by Filament Group https://www.gov.uk/service-manual/making- software/progressive-enhancement http://jakearchibald.com/2013/progressive- enhancement-still-important/ http://alistapart.com/article/ understandingprogressiveenhancement