Responsive Images using <picture> and srcset/sizes

by Matt Steele

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Responsive Images @mattdsteele

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THIS IS WHY YOU’RE FAT

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We’ve put on a little weight.

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http://httparchive.org/trends.php#bytesTotal&reqTotal

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http://httparchive.org/trends.php#bytesTotal&reqTotal Total Page Weight File Size (KB) 1400 1550 1700 1850 July August September October NovemberDecember January February March April May June

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http://httparchive.org/trends.php#bytesTotal&reqTotal Total Page Weight File Size (KB) 1400 1550 1700 1850 July August September October NovemberDecember January February March April May June 1485kb 1521kb 1551kb 1590kb 1614kb 1701kb 1681kb 1710kb 1728kb 1762kb 1775kb 1808kb

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http://httparchive.org/interesting.php Bytes Per Page by Content Type

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http://httparchive.org/interesting.php Images Bytes Per Page by Content Type

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http://httparchive.org/interesting.php HTML Other Flash Stylesheets Scripts Images Bytes Per Page by Content Type

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RETINA- POCALYPSE

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iPhone 3GS

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320x480 iPhone 3GS

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320x480 iPhone 3GS iPhone 4

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320x480 640x960 (2x) iPhone 3GS iPhone 4

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HTC One

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1920x1080 (3x) HTC One

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“Let’s make it responsive!”

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Nexus 10

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2560x1600 (2x) Nexus 10

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2880x1800 (1.6x) MacBook Pro with Retina Display

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320x213 41kb

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320x213 41kb

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320x213 41kb 640x425 137kb

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1280x852 400kb

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72% Responsive sites serve the same content to desktop & mobile http://www.guypo.com/uncategorized/real-world-rwd-performance-take-2/

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Ugh.

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Shortcut:

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9+ SVG

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Grunticon github.com/ﬁlamentgroup/grunticon

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"Vectors are for chumps. I need bitmaps."

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Art Direction

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38 33 Under Consideration

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Screen Size ⊆ What You Need

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Viewport Size

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Viewport Size Screen Density

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Viewport Size Rendered Size Screen Density

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Viewport Size Rendered Size Screen Density Image Dimensions

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Viewport Size Rendered Size Screen Density Image Dimensions Browser knows?

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Viewport Size Rendered Size Screen Density Image Dimensions Browser knows? ✓

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Viewport Size Rendered Size Screen Density Image Dimensions Browser knows? ✓ ✓

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Viewport Size Rendered Size Screen Density Image Dimensions Browser knows? ✓ ✓ ✗

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Viewport Size Rendered Size Screen Density Image Dimensions Browser knows? ✓ ✓ ✗ ✗

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Viewport Size Rendered Size Screen Density Image Dimensions

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Viewport Size Rendered Size Screen Density Image Dimensions Author knows?

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Viewport Size Rendered Size Screen Density Image Dimensions Author knows? ✗ ✗ ✓ ✓

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srcset & sizes

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Image dimensions srcset="large.jpg 1200w, medium.jpg 640w, small.jpg 320w"

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Image dimensions URL srcset="large.jpg 1200w, medium.jpg 640w, small.jpg 320w"

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Image dimensions Width URL srcset="large.jpg 1200w, medium.jpg 640w, small.jpg 320w"

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Rendered Size sizes="(min-width: 1024px) 300px, (min-width: 640px) 50vw, 100vw"

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Rendered Size For this MQ: sizes="(min-width: 1024px) 300px, (min-width: 640px) 50vw, 100vw"

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Rendered Size For this MQ: Image renders this big sizes="(min-width: 1024px) 300px, (min-width: 640px) 50vw, 100vw"

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Rendered Size For this MQ: Image renders this big Default sizes="(min-width: 1024px) 300px, (min-width: 640px) 50vw, 100vw"

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