“ Your success as a developer is not determined by the tools that you use, or even the style of your code, it is the business impact that your code has… ”
19% of people have a disability — 4% of adults have cognitive disabilities 8% of men (and 0.5% of women) are color blind 9% of adults have vision trouble 15% of adults have physical functioning difficulty 17% of adults have hearing trouble CDC Colour Blind Awareness UNH
19% of people have a disability — 4% of adults have cognitive disabilities 8% of men (and 0.5% of women) are color blind 9% of adults have vision trouble 15% of adults have physical functioning difficulty 17% of adults have hearing trouble — 100% of people will be disabled in some way, at some point CDC Colour Blind Awareness UNH
The disability market is about the size of China and is emerging as other markets have in the past— 1.3 billion people and $1.2 trillion in annual disposable income Return on Disability
33% of US adults don’t have home broadband — 46% of black adults 50% of Hispanic adults — 37% of adults who make $20k–$50k/year 59% of adults who make under $20k/year — 45% of adults in rural areas Pew
19% of mobile connections in the US aren’t 4G/LTE 24% of mobile connections in Canada 47% of mobile connections in the UK 51% of mobile connections in India OpenSignal Ericsson
19% of mobile connections in the US aren’t 4G/LTE 24% of mobile connections in Canada 47% of mobile connections in the UK 51% of mobile connections in India 75% of mobile connections in Indonesia are 2G OpenSignal Ericsson
If you only support IE11+ and latest two versions of Chrome, Firefox, Opera, Safari: 360 Safe Browser Android BlackBerry Coc Coc IE (old) IEMobile (old) Maxthon MeeGo Microsoft-WebDAV Mozilla NetFront Nokia Phantom Puffin QQ Browser Samsung Internet StatCounter Sogou Explorer Sony PS3 Sony PS4 SonyEricsson Tizen UC Browser Yandex Browser Other/unknown
If you only support IE11+ and latest two versions of Chrome, Firefox, Opera, Safari: you don’t support 30.03% of network traffic 360 Safe Browser Android BlackBerry Coc Coc IE (old) IEMobile (old) Maxthon MeeGo Microsoft-WebDAV Mozilla NetFront Nokia Phantom Puffin QQ Browser Samsung Internet + older Chrome/Chromium, Firefox, Opera/Opera Mini, Safari StatCounter Sogou Explorer Sony PS3 Sony PS4 SonyEricsson Tizen UC Browser Yandex Browser Other/unknown
page/script download malware blocking/manipulating scripts script parsing plugins/apps blocking/manipulate scripts firewalls CDN failure flakey/dropped connections poorly-written JS ISP blocking/manipulating scripts browsers without modern JS support 1.1% of visits get a broken JavaScript experience — 0.1% turn it off or have a browser that doesn’t support it 0.9% have JS that messes up gov.uk
“ At Internet scale, the best you can hope for is to build a reliable software platform on top of components that are completely unreliable. That puts you in an environment where complex failures are both inevitable and unpredictable. ”