Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Building websites for HiDPI devices
Search
Vinay M
March 23, 2013
Technology
5
5.2k
Building websites for HiDPI devices
Presented at front end meetup Singapore
Vinay M
March 23, 2013
Tweet
Share
More Decks by Vinay M
See All by Vinay M
DRY css with Sass
artminister
1
130
CSS Best Practices
artminister
6
270
Other Decks in Technology
See All in Technology
robocopy の怖い話/scary-story-about-robocopy
emiki
0
210
分散トレーシングによる コネクティッドカーのデータ処理見える化の試み
thatsdone
0
240
ObsidianをLLM時代のナレッジベースに! クリッピング→Markdown→CLI連携の実践
srvhat09
7
9.3k
株式会社島津製作所_研究開発(集団協業と知的生産)の現場を支える、OSS知識基盤システムの導入
akahane92
1
1.2k
経理出身PdMがAIプロダクト開発を_ハンズオンで学んだ話.pdf
shunsukenarita
1
170
機械学習を「社会実装」するということ 2025年夏版 / Social Implementation of Machine Learning July 2025 Version
moepy_stats
1
780
Wasmで社内ツールを作って配布しよう
askua
0
140
Webの技術とガジェットで那須の子ども達にワクワクを! / IoTLT_20250720
you
PRO
0
130
「手を動かした者だけが世界を変える」ソフトウェア開発だけではない開発者人生
onishi
15
6.5k
スプリントレビューを効果的にするために
miholovesq
9
1.6k
AI駆動開発 with MixLeap Study【大阪支部 #3】
lycorptech_jp
PRO
0
230
AI時代の知識創造 ─GeminiとSECIモデルで読み解く “暗黙知”と創造の境界線
nyagasan
0
120
Featured
See All Featured
Improving Core Web Vitals using Speculation Rules API
sergeychernyshev
18
1k
Making the Leap to Tech Lead
cromwellryan
134
9.4k
Intergalactic Javascript Robots from Outer Space
tanoku
271
27k
RailsConf 2023
tenderlove
30
1.2k
実際に使うSQLの書き方 徹底解説 / pgcon21j-tutorial
soudai
PRO
181
54k
The World Runs on Bad Software
bkeepers
PRO
70
11k
Speed Design
sergeychernyshev
32
1k
Producing Creativity
orderedlist
PRO
346
40k
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
126
53k
Designing Experiences People Love
moore
142
24k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
1.8k
Optimising Largest Contentful Paint
csswizardry
37
3.3k
Transcript
BUILDING WEBSITES FOR RETINA (HiDPI) DEVICES Vinay M www.artminister.com
The web’s primary design principle is universality... it should be
accessible from any kind of hardware that can connect to the Internet: stationary or mobile, small screen or large. — Tim Berners-Lee
Pixel Density (PPI) of Devices Windows: ~96 DPI Mac: ~72
- 120 DPI Retina MBP: 220 DPI
Pixel Density (PPI) of Devices Chromebook Pixel : 239 PPI
HTC Jbutterfly Pixel Ratio: 3 PPI: 440 Samsung SIV Pixel
Ratio: 2 PPI: 441 iPhone 5 Pixel Ratio: 2 PPI: 326 Mobile Devices
PPI (Pixels per inch) 320+ PPI 240 PPI 160 PPI
120 PPI Extra HiDPI Baseline for mobile devices
CSS Pixels 568 x 320 Device Pixels @2X iPhone5: 1136
x 640
Non-Retina HiDPI
High DPI • Greater pixel density • Physical Resolution is
higher (2x) • Content Resolution is constant • Content Scale is higher (2x)
Device Independent Pixels • = CSS Pixels • CSS Pixels
= Device Pixels/device-pixel-ratio
What’s the problem IMAGES Images are not sharp on HiDPI
devices
How do we target devices • CSS • Javascript •
Built-in browser features • Server side delivery of images
CSS: device-pixel-ratio USE IT NOW
CSS: device-pixel-ratio • Pros – Downloads the right image based
on pixel-ratio • Cons – No support for <img > – High DPI device will download large image on Low Bandwidth connection – Multiple Image versions
CSS: IMAGE-SET • Only Supports Background Images • Chrome and
Safari support ONLY CHROME & SAFARI, POLYFILL
Browser features • Srcset • Polyfill: https://github.com/borismus/srcset-polyfill/ No browser support
yet. But its in the specs. http://www.w3.org/html/wg/drafts/srcset/w3c-srcset/ POLYFILL
<picture> • Still in the W3C first working draft •
Polyfill: https://github.com/scottjehl/picturefill Source: http://responsiveimages.org POLYFILL
Other Image Tweeks • Background-size: • Compress 2x images –
Webp: https://developers.google.com/speed/webp/
Javacript • Window.devicePixelRatio
window.matchMedia • Media Queries in JS https://hacks.mozilla.org/2012/06/using-window-matchmedia-to-do-media- queries-in-javascript/ SAFARI, CHROME,
FIREFOX MOBILE
Server Side • CMS (Wordpress) • http://www.resrc.it : – Delivers
the right image based on the screen size – Bandwidth Detection
What if everyone has a HiDPI screen • Ultra High
Definition (UHD) – 4k TVs – 8K - 7680×4320 Resolution • vw & vh units – 1 vw = 1/100 of viewport width • 2X the images everywhere ?
Physical Units ? • Very hard to distinguish between devices
– iPad 2 and iPad Mini – Phone to 7’’ tablets – 7’’ tablet to 10’’ tablet • Elements across devices are not of the same physical size – Use <button style=“width: 2inch;”> ? • Safari/Chrome does not support @media screen and (min-resolution :320dpi)
To Consider for HiDPI • Eliminate Images + Use CSS3
• Web fonts for icons • SVG • Use image-set and srcset • Use Viewport units – vw, vh
Thank You • Slides: https://speakerdeck.com/artminister • Many thanks to –
Micheal Cheng (@coderkungfu) – Hackerspace SG • Calling for speakers
Other User groups and Resources • Talk.js http://www.meetup.com/Singapore-JS/events/99986652/ • Singapore
JS https://www.facebook.com/groups/488579174512027/ • HTML5 Rocks SG http://www.meetup.com/HTML5Rocks-SG/ • Webuild – http://webuild.sg