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[cssdevconf] Adaptive Images in Responsive Web Design

This document summarizes Christopher Schmitt's presentation on adaptive images in responsive web design. The presentation covered:1. Using the browser width, screen resolution, and bandwidth to determine the appropriate image to serve through feature testing rather than browser sniffing. 2. Techniques for serving responsive images including using .htaccess files, the <picture> element, and JavaScript libraries like HiSRC that select images based on various tests.3. Workarounds for older browsers including using background-size: 100%, SVG images, and font-based solutions.

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CHRISTOPHER SCHMITT@telejectADAPTIVE IMAGESIN RESPONSIVE WEB DESIGNCSS DEV CONF 2013
@telejectCHRISTOPHER SCHMITT
@teleject
@telejecthttp://nonbreakingspace.tv/
@telejecthttp://artifactconf.com/
yx
WHY DON’T WE ASKTHE BROWSER?(cc) flic.kr/p/vUBHv
alert("User-agent header sent: " + navigator.userAgent);
alert("User-agent header sent: " + navigator.userAgent);
Mozilla/1.0 (Win3.1)http://www.useragentstring.com/(cc) flic.kr/p/vUBHv
Mozilla/1.0 (Win3.1)Mozilla/1.22 (compatible;MSIE 2.0; Windows 95)http://www.useragentstring.com/(cc) flic.kr/p/vUBHv
Mozilla/5.0 (Macintosh; Intel MacOS X 10_7_3) AppleWebKit/534.55.3 (KHTML, like Gecko)Version/5.1.5 Safari/534.55.3http://www.useragentstring.com/(cc) flic.kr/p/vUBHv
Mozilla/5.0 (Macintosh; Intel MacOS X 10_7_3) AppleWebKit/534.55.3 (KHTML, like Gecko)Version/5.1.5 Safari/534.55.3http://webaim.org/blog/user-agent-string-history/(cc) flic.kr/p/vUBHv
http://telejec.tv/12uYOC4
FEATURE TESTINGvs. BROWSER SNIFFING123
FEATURE TESTINGvs. BROWSER SNIFFING123Browser width
A scripting approachvar myWidth = 0, myHeight = 0;if( typeof( window.innerWidth ) == 'number' ) {//Non-IEmyWidth = window.innerWidth;myHeight = window.innerHeight;} else if( document.documentElement &&( document.documentElement.clientWidth ||document.documentElement.clientHeight ) ) {//IE 6+ in 'standards compliant mode'myWidth = document.documentElement.clientWidth;myHeight = document.documentElement.clientHeight;}http://www.howtocreate.co.uk/tutorials/javascript/browserwindow
The jQuery approach// returns width of browser viewport$(window).width();// returns height of browser viewport$(window).height();// returns width of HTML document$(document).width();// returns height of HTML document$(document).height();http://api.jquery.com/width/ & http://api.jquery.com/height/
CSS media queries// default, mobile-1st CSS rules devices go here@media screen and (min-width: 480px) { ... }@media screen and (min-width: 600px) { ... }@media screen and (min-width: 768px) { ... }@media screen and (min-width: 910px) { ... }
(cc) flic.kr/p/8Lo5Gk
BROWSER WIDTHGIVES US FRAME,NOT THE CANVAS
FEATURE TESTINGvs. BROWSER SNIFFING1Browser width2Screen resolution3
72PPIHAS SERVED US WELL(cc) flic.kr/p/6tjjRP
72 points-per-inch =72 pixels-per-inch
96PPIIF A WINDOWS USER
72 points-per-inchx [1+(1/3)]= 96 PPI
“RETINA” DISPLAYS300ppi at 12 inches from the eyesgoo.gl/zpkFy78μm78μm
“[In 2013, Intel sees theirproduct line] offer a higherresolution experience than atop-of-the-line 1080p HDTV.”http://liliputing.com/2012/04/intel-retina-laptopdesktop-displays-coming-in-2013.html
72 PPI
240
240 PPI
240 PPI
72 PPI
RETINA DISPLAYS =LARGER IMAGES,LARGER FILE SIZES
FEATURE TESTINGvs. BROWSER SNIFFING1Browser width2Screen resolution3Bandwidth
SPEED TESTSHINDER SPEED,USER EXPERIENCE(cc) flic.kr/p/4DziUN
“Testing for speed of aninternet connection is likestepping in front of a car to seehow fast it is.”(cc) flic.kr/p/4DziUN
“Testing for speed of aninternet connection is likestepping in front of a car to seehow fast it is.”“But, Christopher, you onlyhave to test it once.”(cc) flic.kr/p/4DziUN
Speed test imagehttps://github.com/adamdbradley/foresight.js
Speed test image+50khttps://github.com/adamdbradley/foresight.js
Native speed test// @Modernizr's network-connection.jsconnection = navigator.connection || {type: 0 }, // polyfillisSlowConnection = connection.type == 3|| connection.type == 4| /^[23]g$/.test(connection.type);http://davidbcalhoun.com/2010/using-navigator-connection-android
FEATURE TESTINGvs. BROWSER SNIFFING1Browser width2Screen resolution3Bandwidth
IMGGIMME THAT OLD SCHOOL123
IMGGIMME THAT OLD SCHOOL123.htaccess
Filament .htaccess# Responsive Images# Mobile-First images that scale responsively and responsibly# Copyright 2010, Scott Jehl, Filament Group, Inc# Dual licensed under the MIT or GPL Version 2 licenses.# //Start Responsive ImagesRewriteEngine On# direct image requests to tempRewriteCond %{QUERY_STRING} full=(.*)&?RewriteRule (.*)rwd-router/.*.(jpe?g|png|gif|webp) $1%1 [L]# ignore trap for non-image requests, rewrite URL without trap segmentRewriteRule (.*)rwd-router/(.*)$ $1$2# //End Responsive Imageshttps://github.com/filamentgroup/Responsive-Images
Filament .htaccess<script src="responsiveimgs.js"></script><img src="sample-content/running-sml.jpg?full=sample-content/running-lrg.jpg" />4+8+
“...the server has no way toknow what resolution theclient’s device is, so it can’tsend the appropriately sizedembeded images.”http://mattwilcox.net/archive/entry/id/1053/
http://adaptive-images.com/
ADD .HTACCESS, JS,PHP 5, GD lib*, &THEN <IMG>
IMGGIMME THAT OLD SCHOOL1.htaccess2<picture> and/or srcset3
media queries in HTML<video controls><source type="video/mp4" src="video/windowsill_small.mp4"media="all and (max-width: 480px), all and (max-device-width:480px)"><source type="video/webm" src="video/windowsill_small.webm"media="all and (max-width: 480px), all and (max-device-width:480px)"><source type="video/mp4" src="video/windowsill.mp4"><source type="video/webm" src="video/windowsill.webm"><!-- proper fallback content goes here --></video>http://www.w3.org/community/respimg/2012/03/15/polyfillingpicture-without-the-overhead/
<picture> patch<picture alt="A giant stone face at The Bayon temple in Angkor Thom,Cambodia"><!-- <source src="small.jpg"> --><source src="small.jpg"><!-- <source src="medium.jpg" media="(min-width: 400px)"> --><source src="medium.jpg" media="(min-width: 400px)"><!-- <source src="large.jpg" media="(min-width: 800px)"> --><source src="large.jpg" media="(min-width: 800px)"><!-- Fallback content for non-JS browsers. Same src as the initialsource element. --><noscript><img src="small.jpg" alt="A giant stone face at The Bayontemple in Angkor Thom, Cambodia"></noscript></picture>http://www.w3.org/community/respimg/2012/03/15/polyfillingpicture-without-the-overhead/
ADD IF-ELSE HTML, JS,BORROW <VIDEO>, &THEN <IMG>
@srcset standard?<h1><img alt="The Breakfast Combo"src="banner.jpeg"srcset="banner-HD.jpeg 2x,banner-phone.jpeg 100w,banner-phone-HD.jpeg 100w 2x"></h1>http://www.whatwg.org/specs/web-apps/current-work/multipage/embedded-content-1.html#attr-img-srcset
https://www.webkit.org/blog/2910/improved-support-forhigh-resolution-displays-with-the-srcset-image-attribute/
IMGGIMME THAT OLD SCHOOL1.htaccess2<picture> and/or srcset3HiSRC
Set, forget it HiSRC<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script><script src="hisrc.js"></script><script>$(document).ready(function(){$(".hisrc img").hisrc();});</script>https://github.com/teleject/hisrc
Set, forget it HiSRC<div class="hisrc"><img src="halloween-mobile-1st.png"data-1x="halloween-x1.png"data-2x="halloween-x2.jpg"alt="Celebrating Halloween in style" /></div>
Set, forget it HiSRC<div class="hisrc"><img src="halloween-mobile-1st.png"data-1x="halloween-x1.png"data-2x="halloween-x2.jpg"alt="Celebrating Halloween in style" /></div>
SERIES OF CHECKS TOFIND OUT RESPONSIVEPATH FOR IMAGES...
DO NATIVE SPEEDTEST FOR MOBILEDEVICES FIRST...http://davidbcalhoun.com/2010/using-navigator-connection-android
Check pixel density...$.hisrc.devicePixelRatio = 1;if(window.devicePixelRatio !==undefined) {$.hisrc.devicePixelRatio =window.devicePixelRatio};https://gist.github.com/2428356
Force speed test+50khttps://github.com/adamdbradley/foresight.js
LESS THAN 4G MEANSMOBILE IMAGES LEFTIN PLACE
BETWEEN 4G &300 Kbps MEANSREGULAR DESKTOPIMAGES SWAPPED IN
FAST SPEED & HIGHDENSITY, RETINAIMAGES SWAPPED INhttps://github.com/crdeutsch/hisrc/tree/v2
http://css-tricks.com/whichresponsive-images-solutionshould-you-use/
24+http://css-tricks.com/whichresponsive-images-solutionshould-you-use/
ALL SOLUTIONS HAVE2x HTTP REQUESTS+ JAVASCRIPThttp://css-tricks.com/whichresponsive-images-solutionshould-you-use/
WORKAROUNDS &TRICKS in CONTEXT123(cc) flic.kr/p/64fGf6
WORKAROUNDS &TRICKS1background-size: 100%23(cc) flic.kr/p/64fGf6
http://fittextjs.com/
background-size: 100%<a href="example.com/link">Download on Github</a>.download a {padding: .095em .8em;background: url(../img/arrow.png) no-repeat;background-size: 100%;margin-left: .4em;-webkit-transition: margin 0.15s ease-out;-moz-transition: margin 0.15s ease-out;text-decoration: none;}17+9+11.6+5+9+
WORKAROUNDS &TRICKS in CONTEXT1background-size: auto2SVG3(cc) flic.kr/p/64fGf6
SVG
Native SVGhttp://caniuse.com/#search=SVG%20in%20HTML%20img%20element
PNG 16kbSVG 7kb17+9+11.6+5+9+
http://petercollingridge.appspot.com/svg-optimiser
https://github.com/svg/svgo-gui
https://github.com/svg/svgo-gui
Modernizr checkif(!Modernizr.svg){var images =document.getElementsByTagName("img");for(var i = 0; i < images.length; i++){var src = images[i].src.split(".");images[i].src = src[0] + ".png";}}http://stackoverflow.com/questions/12846852/svg-png-extension-switch
WORKAROUNDS &TRICKS in CONTEXT1background-size: auto2SVG3font-based solutions(cc) flic.kr/p/64fGf6
“...if you use <metacharset="utf-8"> (you shouldbe for HTML5), you’re addingcommon Unicode characterslike and ✆, and you don’tneed a specific font’s version...just copy and paste them intoyour HTML.”
Font-based RWDhttp://ilovetypography.com/2012/04/11/designing-type-systems/
Font-based RWDavg file size40kb/per fonthttp://ilovetypography.com/2012/04/11/designing-type-systems/
http://css-tricks.com/examples/IconFont/
http://fontello.com/
http://icomoon.io
Font-based icons<style>[data-icon]:before {font-family: 'icon-font';content: attr(data-icon);}</style><a href="http://example.com/cloud/save/"><span data-icon="C" aria-hidden="true"></span>Save to Cloud</a>
WORKAROUNDS &TRICKS in CONTEXT1background-size: 100%2SVG3font-based solutions4compressed JPEGs(cc) flic.kr/p/64fGf6
OS X LionThe world’s most advanced desktopoperating system advances even further.With over 250 new features includingMulti-Touch gestures, Mission Control,full-screen apps, and Launchpad, OS XLion takes the Mac further than ever.Learn MoreiCloudiOS 5OSX LioniPad 2iPhone
!OS X Lion"The world’s most advanced desktopoperating system advances even further.With over 250 new features includingMulti-Touch gestures, Mission Control,full-screen apps, and Launchpad, OS XLion takes the Mac further than ever.←↑Learn MoreiCloudiOS 5OSX LioniPad 2iPhone
!↙OS X Lion"The world’s most advanced desktopoperating system advances even further.With over 250 new features includingMulti-Touch gestures, Mission Control,full-screen apps, and Launchpad, OS XLion takes the Mac further than ever.← ←↑↖↑↗↖Learn MoreiCloudiOS 5OSX LioniPad 2iPhone
(cc) flic.kr/p/64fGf6
446kb < 8,755.2kb0% vs 100%(cc) flic.kr/p/64fGf6
<picture> Patch<picture alt="A giant stone face at The Bayon temple in Angkor Thom,Cambodia"><!-- <source src="small.jpg"> --><source src="small.jpg"><!-- <source src="medium.jpg" media="(min-width: 400px)"> --><source src="medium.jpg" media="(min-width: 400px)"><!-- <source src="large.jpg" media="(min-width: 800px)"> --><source src="large.jpg" media="(min-width: 800px)"><!-- Fallback content for non-JS browsers. Same src as the initialsource element. --><noscript><img src="small.jpg" alt="A giant stone face at The Bayontemple in Angkor Thom, Cambodia"></noscript></picture>http://www.w3.org/community/respimg/2012/03/15/polyfillingpicture-without-the-overhead/
Size TypeDimensionsDisplay Px DensityFile SizeExtreme2276x14001x & 2x446kb1024x15362x1,745kb512x7681x503kb640x9602x746kb320x4801x223kb500x7502x485kb250x3751x145kbExtraLargeLargeMedium
Size TypeDimensionsDisplay Px DensityFile SizeExtreme2276x14001x & 2x446kb1024x15362x1,745kb512x7681x503kb640x9602x746kb320x4801x223kb500x7502x485kb250x3751x145kbExtraLargeLargeMedium
One Image, One IMG<img src="rock-climber.jpg" alt="" />
EXTREMELYCOMPRESSED PROBLEMS(cc) flic.kr/p/64fGf6
COMBO MOVESCLOWN CAR TECHNIQUE+ HIGHLY COMPRESSED JPEGS(cc) flic.kr/p/64fGf6
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 300 329"preserveAspectRatio="xMidYMid meet"><title>Clown Car Technique</title><style>svg {background-size: 100% 100%; background-repeat: no-repeat;}@media screen and (max-width: 400px) {svg {background-image: url(images/small.png");}}@media screen and (min-width: 401px) and (max-width: 700px) {svg {background-image: url(images/medium.png);}}@media screen and (min-width: 701px) and (max-width: 1000px) {svg {background-image: url(images/big.png);}https://github.com/estelle/clowncar}@media screen and (min-width: 1001px) {
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 300 329"preserveAspectRatio="xMidYMid meet"><title>Clown Car Technique</title><style>svg {background-size: 100% 100%; background-repeat: no-repeat;}@media screen and (max-width: 400px) {svg {background-image: url(images/small.png");}}@media screen and (min-width: 401px) and (max-width: 700px) {svg {background-image: url(images/medium.png);}}@media screen and (min-width: 701px) and (max-width: 1000px) {svg {background-image: url(images/big.png);}https://github.com/estelle/clowncar}@media screen and (min-width: 1001px) {
http://coding.smashingmagazine.com/2013/06/02/clowncar-technique-solving-for-adaptive-images-in-responsiveweb-design/
Combo Move: SVG<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0375 231" preserveAspectRatio="xMidYMid meet"tabindex="-1"aria-label="the aria label is being read" role="img"title="the title attribute of the SVG is being read"><title>Clown Car Technique</title><style></style></svg>http://codepen.io/teleject/pen/KlzBe
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 375231" preserveAspectRatio="xMidYMid meet" tabindex="-1"aria-label="aria label" role="img"title="title attribute"><title>Clown Car Technique</title><style></style><foreignObject><!--[if lte IE 8]><img src="../images/mobile-first.png" width="375"height="231" alt=""/><![endif]--></foreignObject></svg>http://codepen.io/teleject/pen/KlzBe
Combo Move: SVGsvg {background-size: 100% 100%;background-repeat: no-repeat;}http://codepen.io/teleject/pen/KlzBe
svg {background-size: 100% 100%;background-repeat: no-repeat;}@media screen and (max-width: 400px) {svg {background-image: url("http://s.cdpn.io/168/picMedium-375x231-@1x-72ppi.jpg"); outline: green solid5px;}}http://codepen.io/teleject/pen/KlzBe
Size TypeDimensionsDisplay Px DensityFile SizeExtreme2276x14001x & 2x446kb1024x15362x1,745kb512x7681x503kb640x9602x746kb320x4801x223kb500x7502x485kb250x3751x145kbExtraLargeLargeMedium
Combo Move:Compressed JPEG@media screen and (min-width: 401px),screen and (max-width: 800px) and (-webkit-min-device-pixelratio: 1.75) {svg {background-image: url("extremely-highlycompressed.jpg");outline: red solid 5px;}}http://codepen.io/teleject/pen/KlzBe
@media screen and (max-width: 400px) {svg {width: 375px;height: 231px; } }@media screen and (min-width: 401px) {svg {width: 750px;height: 462px; } }svg {outline: 5px solid black; }http://codepen.io/teleject/pen/KlzBe
http://codepen.io/teleject/pen/KlzBe
http://codepen.io/teleject/pen/KlzBe
http://codepen.io/teleject/pen/KlzBe
COMBO MOVEDON’T BLAME THE PLAYER1No additional HTTP request2# of images = 23No JavaScripthttp://codepen.io/teleject/pen/KlzBe
IMGGIMME THAT NEW SCHOOL123#rwdimg
IMGGIMME THAT NEW SCHOOL1simple design for users23#rwdimg
IMGGIMME THAT NEW SCHOOL1simple design for users2browser, server handshake3#rwdimg
IMGGIMME THAT NEW SCHOOL1simple design for users2browser, server handshake3same, several formats#rwdimg
#rwdimg
#rwdimg
#rwdimg
#rwdimg
Favicon<link rel="shortcut icon" href="/assets/favicon.ico" />#rwdimg
Mobile iOS Bookmarks<link rel="apple-touch-icon-precomposed" sizes="144x144"href="apple-touch-icon-144x144-precomposed.png" /><link rel="apple-touch-icon-precomposed" sizes="114x114"href="apple-touch-icon-114x114-precomposed.png" /><link rel="apple-touch-icon-precomposed" sizes="72x72"href="apple-touch-icon-72x72-precomposed.png" /><link rel="apple-touch-icon-precomposed"href="apple-touch-icon-precomposed.png" />#rwdimg
#rwdimg
THANK YOU!CHRISTOPHER SCHMITT@telejectThe Non Breaking Space Podcast - http://nonbreakingspace.tv/

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