This is a talk I gave in Verona, Italy at JSDay 2013 on May 16th

1. Practial Responsive
Web Design
JSDay 2013
Jonathan Klein, Performance Engineer
@jonathanklein
Friday, May 10, 13

2. Slides, Links
jkle.in/jsday
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3. 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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4. Two Assertions
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5. 1. RWD isn’t that hard
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6. 2. RWD can be fast
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7. The Basics
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8. 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) {...}
Friday, May 10, 13

9. 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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10. Friday, May 10, 13

11. Breakpoints
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12. Friday, May 10, 13

13. What Breakpoints to Use?
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14. What Breakpoints to Use?
• Don’t think about devices
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15. What Breakpoints to Use?
• Don’t think about devices
• “Make it look good”
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16. What Breakpoints to Use?
• Don’t think about devices
• “Make it look good”
• Something like 600px, 900px, max
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17. 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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18. Retina Images
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19. 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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20. 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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21. 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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22. RWD In Action
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23. Friday, May 10, 13

24. Friday, May 10, 13

25. Clean up some CSS
.article {
width: 31%;
min-width:250px;
}
#content .wrapper {
width:auto;
}
#page {
background:none;
}
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26. 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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27. Friday, May 10, 13

28. Performance
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29. A Few Considerations
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30. A Few Considerations
• Extra CSS (minimal)
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31. A Few Considerations
• Extra CSS (minimal)
• Retina Images (ouch)
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32. A Few Considerations
• Extra CSS (minimal)
• Retina Images (ouch)
• Larger images than needed
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33. A Few Considerations
• Extra CSS (minimal)
• Retina Images (ouch)
• Larger images than needed
• Extra Image Requests
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34. A Few Considerations
• Extra CSS (minimal)
• Retina Images (ouch)
• Larger images than needed
• Extra Image Requests
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35. Responsive Images
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36. Three Performance Goals:
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37. Three Performance Goals:
1. Start with a small image
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38. Three Performance Goals:
1. Start with a small image
2. Upgrade to larger size without
downloading both
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39. 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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40. • Resize on the fly
• Compress automatically
First Step: Automation
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41. Lossless Compression
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42. 140 KB
Lossless Compression
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43. 140 KB 85 KB
Lossless Compression
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44. 140 KB 85 KB
Lossless Compression
• http://www.smushit.com/ysmush.it/
• https://developers.google.com/speed/pagespeed/
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45. • Automate HTML output
• Plan for the future
More Automation
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46. HTML Output (picturefill)
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47. HTML Output (picturefill)
• https://github.com/scottjehl/picturefill
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48. HTML Output (picturefill)
• https://github.com/scottjehl/picturefill
• Mimics proposed <picture> element
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49. HTML Output (picturefill)
• https://github.com/scottjehl/picturefill
• Mimics proposed <picture> element
• < 0.5K JS file
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50. HTML Output (picturefill)
• https://github.com/scottjehl/picturefill
• Mimics proposed <picture> element
• < 0.5K JS file
• Supports all media queries
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51. HTML Output (picturefill)
• https://github.com/scottjehl/picturefill
• Mimics proposed <picture> element
• < 0.5K JS file
• Supports all media queries
• Works across all browsers
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52. <div data-picture data-alt="Interesting Image Alt Text">
<div data-src="small.jpg"></div>
<div data-src="medium.jpg" data-media="(min-width: 400px)"></div>
<div data-src="large.jpg" data-media="(min-width: 800px)"></div>
<div data-src="extralarge.jpg" data-media="(min-width: 1000px)"></div>
<!-- Fallback content for non-JS browsers. Same img src as the initial,
unqualified source element. -->
<noscript>
<img src="external/imgs/small.jpg" alt="Interesting Image Alt Text">
</noscript>
</div>
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53. <div data-picture data-alt="Interesting Image Alt Text">
<div data-src="small.jpg"></div>
<div data-src="medium.jpg" data-media="(min-width: 400px)"></div>
<div data-src="large.jpg" data-media="(min-width: 800px)"></div>
<div data-src="extralarge.jpg" data-media="(min-width: 1000px)"></div>
<!-- Fallback content for non-JS browsers. Same img src as the initial,
unqualified source element. -->
<noscript>
<img src="external/imgs/small.jpg" alt="Interesting Image Alt Text">
</noscript>
</div>
IE 6, 7, 8 get this
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54. How does it do?
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55. How does it do?
✓ Unique image URLs
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56. How does it do?
✓ Unique image URLs
✓ Start with smallest image
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57. How does it do?
✓ Unique image URLs
✓ Start with smallest image
✓ Only one image download
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58. How does it do?
✓ Unique image URLs
✓ Start with smallest image
✓ Only one image download
✓ Fallback for old IE
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59. But that markup...
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60. Plan to Replace
Whatever You Build
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61. 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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62. Don’t type, click:
jkle.in/jsday
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63. Browser Support
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64. Friday, May 10, 13

65. Fail
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66. Handle IE
Conditional Comments
<!--[if lt IE 9]><![endif]-->
http://adactio.com/journal/4494/
More: http://buildmobile.com/understanding-responsive-web-
design-cross-browser-compatibility/
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67. The Future:
Client Hints
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68. Proposal by Ilya Grigorik
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69. Proposal by Ilya Grigorik
• Client (browser) sends an additional
HTTP Header
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70. Proposal by Ilya Grigorik
• Client (browser) sends an additional
HTTP Header
• CH: dh=598, dw=384, dpr=2.0, t
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71. 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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72. Homework
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73. Friday, May 10, 13

74. Find your favorite non-responsive site
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75. Find your favorite non-responsive site
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76. Find your favorite non-responsive site
Save the HTML locally
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77. Find your favorite non-responsive site
Save the HTML locally
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78. Find your favorite non-responsive site
Save the HTML locally
Add some media queries and a breakpoint
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79. Find your favorite non-responsive site
Save the HTML locally
Add some media queries and a breakpoint
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80. 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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81. 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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82. Welcome to the world
of RWD
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83. • 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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84. Friday, May 10, 13

85. Recap
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86. Recap
• Start with small sizes on new sites
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87. Recap
• Start with small sizes on new sites
• Use em’s and %’s
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88. Recap
• Start with small sizes on new sites
• Use em’s and %’s
• ~3-4 device independent breakpoints
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89. 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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90. 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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91. Get in Touch
www.etsy.com/careers
jonathan@etsy.com
@jonathanklein
Friday, May 10, 13