Cohort analysis by browser

[dfabulich]

In the browser-cohort branch, I added support for estimating the time to widespread availability by keystone browser. By passing --browser=safari, you can see the results on a browser by browser basis. Here are the results.

Click here to see all data tables

# Output

Cohort chrome

1 feature(s): array-find-index

Market Share	50% of features	75% of features	80% of features	90% of features	95% of features	97% of features	98% of features	99% of features
80% share	59 months	59 months	59 months	59 months	59 months	59 months	59 months	59 months
90% share	59 months	59 months	59 months	59 months	59 months	59 months	59 months	59 months
95% share	59 months	59 months	59 months	59 months	59 months	59 months	59 months	59 months
97% share	87 months	87 months	87 months	87 months	87 months	87 months	87 months	87 months
98% share	never	never	never	never	never	never	never	never
99% share	never	never	never	never	never	never	never	never

Cohort edge

99 feature(s): apng,array-find,array-flat,array-includes,bloburls,canvas-blending,chacha20-poly1305,childnode-remove,constraint-validation,contentsecuritypolicy2,cryptography,css-all,css-any-link,css-backgroundblendmode,css-caret-color,css-case-insensitive,css-default-pseudo,css-env-function,css-filters,css-focus-within,css-font-rendering-controls,css-grid,css-image-orientation,css-in-out-of-range,css-indeterminate-pseudo,css-matches-pseudo,css-not-sel-list,css-placeholder,css-placeholder-shown,css-revert-value,css-rrggbbaa,css-shapes,css-snappoints,css-sticky,css-supports-api,css-textshadow,css-variables,datauri,date-tolocaledatestring,details,dom-manip-convenience,element-closest,es6-module,es6-module-dynamic-import,eventsource,fileapi,flow-root,font-kerning,font-loading,font-unicode-range,font-variant-alternates,font-variant-numeric,form-attribute,getboundingclientrect,iframe-srcdoc,indexeddb,indexeddb2,input-minlength,intl-pluralrules,justify-content-space-evenly,kerning-pairs-ligatures,keyboardevent-key,matchesselector,object-fit,ol-reversed,once-event-listener,outline,pad-start-end,passive-event-listener,path2d,prefers-color-scheme,prefers-reduced-motion,promise-finally,rel-noopener,rel-noreferrer,rellist,rtcpeerconnection,serviceworkers,shadowdomv1,srcset,subresource-integrity,svg,svg-css,svg-html5,svg-smil,template,text-emphasis,textencoder,transforms2d,unhandledrejection,upgradeinsecurerequests,urlsearchparams,vector-effect,viewport-unit-variants,viewport-units,wasm,webgl,will-change,wordwrap

Market Share	50% of features	75% of features	80% of features	90% of features	95% of features	97% of features	98% of features	99% of features
80% share	0 months	2 months	2 months	10 months	17 months	18 months	18 months	20 months
90% share	4 months	13 months	16 months	23 months	28 months	32 months	never	never
95% share	27 months	35 months	40 months	53 months	never	never	never	never
97% share	never	never	never	never	never	never	never	never
98% share	never	never	never	never	never	never	never	never
99% share	never	never	never	never	never	never	never	never

Cohort firefox

22 feature(s): background-position-x-y,background-repeat-round-space,border-radius,channel-messaging,css-color-function,css-conic-gradients,css-container-queries,css-container-query-units,css-font-palette,css-lch-lab,css-math-functions,css-media-interaction,css-nth-child-of,css-read-only-write,css3-tabsize,document-scrollingelement,es6-class,focusin-focusout-events,font-family-system-ui,innertext,insert-adjacent,link-rel-preload

Market Share	50% of features	75% of features	80% of features	90% of features	95% of features	97% of features	98% of features	99% of features
80% share	0 months	1 months	2 months	6 months	17 months	23 months	23 months	23 months
90% share	3 months	never	never	never	never	never	never	never
95% share	22 months	never	never	never	never	never	never	never
97% share	never	never	never	never	never	never	never	never
98% share	never	never	never	never	never	never	never	never
99% share	never	never	never	never	never	never	never	never

Cohort safari

26 feature(s): abortcontroller,arrow-functions,brotli,comparedocumentposition,css-animation,css-featurequeries,css-font-stretch,css-text-orientation,eme,es6-generators,es6-number,es6-string-includes,flac,flexbox,input-event,internationalization,localecompare,proxy,resource-timing,rest-parameters,svg-img,template-literals,tls1-3,webp,woff2,word-break

Market Share	50% of features	75% of features	80% of features	90% of features	95% of features	97% of features	98% of features	99% of features
80% share	2 months	16 months	17 months	19 months	19 months	29 months	29 months	29 months
90% share	19 months	30 months	31 months	42 months	42 months	44 months	44 months	44 months
95% share	35 months	47 months	47 months	54 months	54 months	56 months	56 months	56 months
97% share	74 months	never	never	never	never	never	never	never
98% share	never	never	never	never	never	never	never	never
99% share	never	never	never	never	never	never	never	never

##Cohort ios_saf
52 feature(s): async-functions,audio-api,beacon,beforeafterprint,bigint,border-image,broadcastchannel,const,css-appearance,css-cascade-layers,css-containment,css-focus-visible,css-gradients,css-logical-props,css-media-range-syntax,css-media-resolution,css-motion-paths,css-overflow,css-overscroll-behavior,css-text-align-last,css-unset-value,css-writing-mode,dialog,download,element-scroll-methods,fetch,flexbox-gap,font-feature,form-validation,gamepad,import-maps,indeterminate-checkbox,input-pattern,js-regexp-lookbehind,keyboardevent-getmodifierstate,let,link-icon-png,mediarecorder,meter,object-entries,object-values,offscreencanvas,permissions-api,picture,pointer,resizeobserver,screen-orientation,scrollintoview,svg-fragment,transforms3d,user-timing,webgl2

Market Share	50% of features	75% of features	80% of features	90% of features	95% of features	97% of features	98% of features	99% of features
80% share	1 months	2 months	5 months	20 months	never	never	never	never
90% share	9 months	25 months	35 months	never	never	never	never	never
95% share	44 months	never	never	never	never	never	never	never
97% share	never	never	never	never	never	never	never	never
98% share	never	never	never	never	never	never	never	never
99% share	never	never	never	never	never	never	never	never

Considering just 2020

Cohort 2020 edge

57 feature(s): apng,array-flat,chacha20-poly1305,contentsecuritypolicy2,cryptography,css-all,css-any-link,css-backgroundblendmode,css-caret-color,css-case-insensitive,css-default-pseudo,css-env-function,css-filters,css-focus-within,css-font-rendering-controls,css-in-out-of-range,css-indeterminate-pseudo,css-placeholder,css-placeholder-shown,css-revert-value,css-rrggbbaa,css-shapes,css-snappoints,css-supports-api,css-textshadow,datauri,details,es6-module,es6-module-dynamic-import,eventsource,fileapi,flow-root,font-kerning,font-loading,font-variant-numeric,getboundingclientrect,iframe-srcdoc,indexeddb,indexeddb2,intl-pluralrules,justify-content-space-evenly,keyboardevent-key,object-fit,ol-reversed,path2d,prefers-color-scheme,prefers-reduced-motion,rel-noopener,rtcpeerconnection,shadowdomv1,svg,svg-smil,textencoder,unhandledrejection,vector-effect,webgl,will-change

Market Share	50% of features	75% of features	80% of features	90% of features	95% of features	97% of features	98% of features	99% of features
80% share	0 months	0 months	0 months	2 months	2 months	6 months	6 months	16 months
90% share	0 months	6 months	7 months	10 months	14 months	16 months	16 months	16 months
95% share	10 months	30 months	30 months	33 months	33 months	34 months	34 months	never
97% share	40 months	never	never	never	never	never	never	never
98% share	never	never	never	never	never	never	never	never
99% share	never	never	never	never	never	never	never	never

Cohort 2020 firefox

3 feature(s): css-conic-gradients,css-math-functions,css-read-only-write

Market Share	50% of features	75% of features	80% of features	90% of features	95% of features	97% of features	98% of features	99% of features
80% share	0 months	4 months	4 months	4 months	4 months	4 months	4 months	4 months
90% share	2 months	13 months	13 months	13 months	13 months	13 months	13 months	13 months
95% share	22 months	never	never	never	never	never	never	never
97% share	never	never	never	never	never	never	never	never
98% share	never	never	never	never	never	never	never	never
99% share	never	never	never	never	never	never	never	never

Cohort 2020 safari

3 feature(s): css-text-orientation,input-event,tls1-3

Market Share	50% of features	75% of features	80% of features	90% of features	95% of features	97% of features	98% of features	99% of features
80% share	0 months	0 months	0 months	0 months	0 months	0 months	0 months	0 months
90% share	0 months	5 months	5 months	5 months	5 months	5 months	5 months	5 months
95% share	2 months	24 months	24 months	24 months	24 months	24 months	24 months	24 months
97% share	never	never	never	never	never	never	never	never
98% share	never	never	never	never	never	never	never	never
99% share	never	never	never	never	never	never	never	never

Cohort 2020 ios_saf

2 feature(s): bigint,resizeobserver

Market Share	50% of features	75% of features	80% of features	90% of features	95% of features	97% of features	98% of features	99% of features
80% share	1 months	3 months	3 months	3 months	3 months	3 months	3 months	3 months
90% share	9 months	11 months	11 months	11 months	11 months	11 months	11 months	11 months
95% share	30 months	32 months	32 months	32 months	32 months	32 months	32 months	32 months
97% share	never	never	never	never	never	never	never	never
98% share	never	never	never	never	never	never	never	never
99% share	never	never	never	never	never	never	never	never

80% of features reaching 95% market share

• Edge: 40 months
• Firefox: never
• macOS Safari: 47 months
• iOS Safari: never

Just 2020 features

• Edge: 30 months
• Firefox: never
• macOS Safari: 24 months
• iOS Safari: 32 months

Conclusions

• Chrome is almost never the keystone browser, because anything released in Chrome releases in Edge shortly afterwards. Chrome was the keystone browser for just one feature, array-find-index in 2015.
• Slicing by browser, there are probably too few data points to draw a statistically reasonable conclusion
• … especially when we also filter down to a single calendar year