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Practical Responsive
Web Design
JSDay 2013
Jonathan Klein, Performance Engineer
@jonathanklein
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Slides, Links
jkle.in/jsday
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Some Etsy Stats
• Handmade marketplace
• 1.4 billion page views/month
• Almost $1B in sales last year
• ~1M lines of JavaScript
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Two Assertions
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1. RWD isn’t that hard
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2. RWD can be fast
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The Basics
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Building blocks of RWD
/* Greater than 900px wide */
@media screen and (min-width: 56.25em) {...}
!
/* Retina Display */
@media screen and (min-device-pixel-ratio: 2) {...}
!
/* You can chain these */
@media screen and (min-width: 56.25em) and (min-
device-pixel-ratio: 2) {...}
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Building blocks of RWD
/* Greater than 900px wide */
@media screen and (min-width: 56.25em) {...}
!
/* Retina Display */
@media screen and (min-device-pixel-ratio: 2) {...}
!
/* You can chain these */
@media screen and (min-width: 56.25em) and (min-
device-pixel-ratio: 2) {...}
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Breakpoints
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What Breakpoints to Use?
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What Breakpoints to Use?
• Don’t think about devices
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What Breakpoints to Use?
• Don’t think about devices
• “Make it look good”
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What Breakpoints to Use?
• Don’t think about devices
• “Make it look good”
• Something like 600px, 900px, max
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What Breakpoints to Use?
• Don’t think about devices
• “Make it look good”
• Something like 600px, 900px, max
• Divide by 16 to get em’s
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Retina Images
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Start With the Normal Version
!
/* Small version of the logo */
.logo {
background-image: url(logo_sm.png);
background-repeat: no-repeat;
background-position: center;
background-size: 230px 50px;
}
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Start With the Normal Version
!
/* Small version of the logo */
.logo {
background-image: url(logo_sm.png);
background-repeat: no-repeat;
background-position: center;
background-size: 230px 50px;
}
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High Res Screens
!
!
!
!
/* Provide a hi-res logo for retina screens */
@media screen and (-webkit-min-device-pixel-ratio: 2) {
.logo {
background-image: url(logo_lg.png);
}
}
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RWD In Action
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Clean up some CSS
.article {
width: 31%;
min-width:250px;
}
!
#content .wrapper {
width:auto;
}
!
#page {
background:none;
}
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Make it Responsive
/* Two articles across */
@media screen and (max-width: 850px) {
.article {
width: 46%;
}
}
!
/* One article across */
@media screen and (max-width: 530px) {
.article {
width: 90%;
}
}
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Performance
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A Few Considerations
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A Few Considerations
• Extra CSS (minimal)
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A Few Considerations
• Extra CSS (minimal)
• Retina Images (ouch)
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A Few Considerations
• Extra CSS (minimal)
• Retina Images (ouch)
• Larger images than needed
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A Few Considerations
• Extra CSS (minimal)
• Retina Images (ouch)
• Larger images than needed
• Extra Image Requests
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A Few Considerations
• Extra CSS (minimal)
• Retina Images (ouch)
• Larger images than needed
• Extra Image Requests
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Responsive Images
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Three Performance Goals:
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Three Performance Goals:
1. Start with a small image
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Three Performance Goals:
1. Start with a small image
2. Upgrade to larger size without
downloading both
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Three Performance Goals:
1. Start with a small image
2. Upgrade to larger size without
downloading both
3. Unique image URLs (caching)
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• Resize on the fly
• Compress automatically
First Step: Automation
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Lossless Compression
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140 KB
Lossless Compression
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140 KB 85 KB
Lossless Compression
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140 KB 85 KB
Lossless Compression
• http://www.smushit.com/ysmush.it/
• https://developers.google.com/speed/pagespeed/
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• Automate HTML output
• Plan for the future
More Automation
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HTML Output (picturefill)
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HTML Output (picturefill)
• https://github.com/scottjehl/picturefill
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HTML Output (picturefill)
• https://github.com/scottjehl/picturefill
• Mimics proposed element
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HTML Output (picturefill)
• https://github.com/scottjehl/picturefill
• Mimics proposed element
• < 0.5K JS file
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HTML Output (picturefill)
• https://github.com/scottjehl/picturefill
• Mimics proposed element
• < 0.5K JS file
• Supports all media queries
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HTML Output (picturefill)
• https://github.com/scottjehl/picturefill
• Mimics proposed element
• < 0.5K JS file
• Supports all media queries
• Works across all browsers
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!
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!
IE 6, 7, 8 get this
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How does it do?
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How does it do?
✓ Unique image URLs
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How does it do?
✓ Unique image URLs
✓ Start with smallest image
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How does it do?
✓ Unique image URLs
✓ Start with smallest image
✓ Only one image download
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How does it do?
✓ Unique image URLs
✓ Start with smallest image
✓ Only one image download
✓ Fallback for old IE
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But that markup...
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Plan to Replace
Whatever You Build
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Resources for Responsive Imgs
Jason Grigsby:
!
http://blog.cloudfour.com/responsive-imgs/
http://blog.cloudfour.com/responsive-imgs-part-2/
http://blog.cloudfour.com/responsive-imgs-part-3-future-of-the-img-tag/
http://blog.cloudfour.com/8-guidelines-and-1-rule-for-responsive-images/
http://blog.cloudfour.com/sensible-jumps-in-responsive-image-file-sizes/
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Don’t type, click:
jkle.in/jsday
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Browser Support
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Fail
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Handle IE
Conditional Comments
http://adactio.com/journal/4494/
!
!
More: http://buildmobile.com/understanding-responsive-web-
design-cross-browser-compatibility/
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The Future:
Client Hints
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Proposal by Ilya Grigorik
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Proposal by Ilya Grigorik
• Client (browser) sends an additional
HTTP Header
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Proposal by Ilya Grigorik
• Client (browser) sends an additional
HTTP Header
• CH: dh=598, dw=384, dpr=2.0, t
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Proposal by Ilya Grigorik
• Client (browser) sends an additional
HTTP Header
• CH: dh=598, dw=384, dpr=2.0, t
• https://github.com/igrigorik/http-client-hints/
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Homework
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Find your favorite non-responsive site
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Find your favorite non-responsive site
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Find your favorite non-responsive site
Save the HTML locally
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Find your favorite non-responsive site
Save the HTML locally
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Find your favorite non-responsive site
Save the HTML locally
Add some media queries and a breakpoint
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Find your favorite non-responsive site
Save the HTML locally
Add some media queries and a breakpoint
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Find your favorite non-responsive site
Save the HTML locally
Add some media queries and a breakpoint
Make one retina image and use it
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Find your favorite non-responsive site
Save the HTML locally
Add some media queries and a breakpoint
Make one retina image and use it
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Welcome to the world
of RWD
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• Resize browser window, use console
when you want a breakpoint
• document.body.offsetWidth
• If you must start w/ desktop, use:
• @media screen and (max-width: 900px) {
Some Hints
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Recap
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Recap
• Start with small sizes on new sites
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Recap
• Start with small sizes on new sites
• Use em’s and %’s
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Recap
• Start with small sizes on new sites
• Use em’s and %’s
• ~3-4 device independent breakpoints
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Recap
• Start with small sizes on new sites
• Use em’s and %’s
• ~3-4 device independent breakpoints
• Use Responsive Images
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Recap
• Start with small sizes on new sites
• Use em’s and %’s
• ~3-4 device independent breakpoints
• Use Responsive Images
• Have a fallback plan for IE
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Get in Touch
!
www.etsy.com/careers
!
jonathan@etsy.com
!
@jonathanklein