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Responsive Images using <picture> and srcset/sizes
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Matt Steele
July 02, 2014
Programming
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1.3k
Responsive Images using <picture> and srcset/sizes
Matt Steele
July 02, 2014
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Transcript
Responsive Images @mattdsteele
THIS IS WHY YOU’RE FAT
We’ve put on a little weight.
http://httparchive.org/trends.php#bytesTotal&reqTotal
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
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
http://httparchive.org/interesting.php Bytes Per Page by Content Type
http://httparchive.org/interesting.php Images Bytes Per Page by Content Type
http://httparchive.org/interesting.php HTML Other Flash Stylesheets Scripts Images Bytes Per Page
by Content Type
RETINA- POCALYPSE
None
iPhone 3GS
320x480 iPhone 3GS
320x480 iPhone 3GS iPhone 4
320x480 640x960 (2x) iPhone 3GS iPhone 4
HTC One
1920x1080 (3x) HTC One
“Let’s make it responsive!”
Nexus 10
2560x1600 (2x) Nexus 10
2880x1800 (1.6x) MacBook Pro with Retina Display
None
None
None
320x213 41kb
320x213 41kb
320x213 41kb 640x425 137kb
None
1280x852 400kb
72% Responsive sites serve the same content to desktop &
mobile http://www.guypo.com/uncategorized/real-world-rwd-performance-take-2/
Ugh.
Shortcut: <SVG>
<img src="logo.svg">
9+ SVG
Grunticon github.com/filamentgroup/grunticon
"Vectors are for chumps. I need bitmaps."
None
<picture>
<picture> <img src="fallback.png"> </picture>
<picture> <source media="(min-width: 1000px)" srcset="large.png"> <source media="(min-width: 640px)" srcset="medium.png"> <img
src="fallback.png"> </picture>
<picture> <source media="(min-width: 1000px)" srcset="large.webp" type="image/webp"> <source media="(min-width: 1000px)" srcset="large.png">
<source media="(min-width: 640px)" srcset="medium.png"> <img src="fallback.png"> </picture>
None
None
None
Art Direction
<picture> 38 33 Under Consideration
None
None
Screen Size ⊆ What You Need
None
Viewport Size
Viewport Size Screen Density
Viewport Size Rendered Size Screen Density
Viewport Size Rendered Size Screen Density Image Dimensions
Viewport Size Rendered Size Screen Density Image Dimensions Browser knows?
Viewport Size Rendered Size Screen Density Image Dimensions Browser knows?
✓
Viewport Size Rendered Size Screen Density Image Dimensions Browser knows?
✓ ✓
Viewport Size Rendered Size Screen Density Image Dimensions Browser knows?
✓ ✓ ✗
Viewport Size Rendered Size Screen Density Image Dimensions Browser knows?
✓ ✓ ✗ ✗
Viewport Size Rendered Size Screen Density Image Dimensions
Viewport Size Rendered Size Screen Density Image Dimensions Author knows?
Viewport Size Rendered Size Screen Density Image Dimensions Author knows?
✗ ✗ ✓ ✓
srcset & sizes
Image dimensions srcset="large.jpg 1200w, medium.jpg 640w, small.jpg 320w"
Image dimensions URL srcset="large.jpg 1200w, medium.jpg 640w, small.jpg 320w"
Image dimensions Width URL srcset="large.jpg 1200w, medium.jpg 640w, small.jpg 320w"
Rendered Size sizes="(min-width: 1024px) 300px, (min-width: 640px) 50vw, 100vw"
Rendered Size For this MQ: sizes="(min-width: 1024px) 300px, (min-width: 640px)
50vw, 100vw"
Rendered Size For this MQ: Image renders this big sizes="(min-width:
1024px) 300px, (min-width: 640px) 50vw, 100vw"
Rendered Size For this MQ: Image renders this big Default
sizes="(min-width: 1024px) 300px, (min-width: 640px) 50vw, 100vw"
<img src="small.jpg" alt="A responsive image" srcset="large.jpg 1200w, medium.jpg 640w, small.jpg
320w" sizes="(min-width: 1024px) 300px, (min-width: 640px) 50vw, 100vw">
Screen Densities
Configurable
Configurable •HD Mode
Configurable •HD Mode •Speed Mode
Configurable •HD Mode •Speed Mode •Crappy Network Mode
srcset 32 Under Consideration
Fallbacks built-in
Or: Picturefill http://scottjehl.github.io/picturefill/
Go Forth And Get Skinny
@mattdsteele flic.kr/p/7TH4dc