SSR, SPAs and PWAs
The Return of Progressive
Enhancement
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Marco Otte-Witte
@marcoow
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simplabs.com
@simplabs
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SSR, SPAs and PWAs
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Classic (SSR) web sites
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No content
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GET /
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No content
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No content
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GET /?search=Nürnberg
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No content
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GET /locations/1
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No content
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• document is visually complete as received from server
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• document is visually complete as received from server
• …as well as immediately functional
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• document is visually complete as received from server
• …as well as immediately functional
• subsequent page transitions require server roundtrips
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Single Page Apps
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GET /
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No content
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GET /app.js
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No content
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No content
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GET /api/locations?search=Nürnberg
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No content
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GET /api/measurements?location=1
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No content
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• initial document is essentially useless
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• initial document is essentially useless
• …until JS loads, app starts and runs completely in the browser
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• initial document is essentially useless
• …until JS loads, app starts and runs completely in the browser
• subsequent page transitions are client-side and thus fast
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• initial document is essentially useless
• …until JS loads, app starts and runs completely in the browser
• subsequent page transitions are client-side and thus fast
• only data is loaded lazily
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• initial document is essentially useless
• …until JS loads, app starts and runs completely in the browser
• subsequent page transitions are client-side and thus fast
• only data is loaded lazily
• requires JS to work at all