Suggestion	Votes
1. HTTP content-encoding: zstd	31
2. Suggestion: MediaRecorder.isTypeSupported supported types/codecs	29
3. Add support table for CSP 3.0 compliance	29
4. Add HTTP 103 Early Hints	27
5. css/svg property dominant-baseline	26
6. Add WebCodecs API	25
7. window.onerror - / - particularly mobile browser support	24
8. Can I use Reporting API	23
9. Add CSS Color Module Level 5 (color-mix(), color-contrast(), Relative color)	22
10. Add WebDriver	22
11. Add ES7/2016 SIMD	21
12. Entries for href values including `tel:1234567` and `sms:1234567`	21
13. text-wrap	21
14. Hyphenation Options	20
15. Track support for newly added spec: Dimensions (width/height) in <source> tags	20
16. JavaScript: Tail Call Support information missing	19
17. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	18
18. Priority hints API	18
19. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	18
20. XSLT Support table	18
21. TLS ECH (Encrypted Client Hello), formerly known as ESNI (Encrypted Server Name Indication)	17
22. New feature: CSS Typed Object Model (CSS Typed OM)	17
23. WebExtensions (browser extensions)	17
24. device-cmyk css feature	16
25. + WASM SIMD	16
26. Support constructible stylesheets / adoptedStyleSheets	16
27. Page Lifecycle API	16
28. WebTransport	15
29. Add CSS Grid Layout Module Level 3 (Masonry!)	15
30. Support Intrinsic Size Attribute	15
31. border-corner-shape	15
32. `content: leader('.');`	14
33. Add Media Queries Ranges	14
34. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	13
35. Geo URI scheme	13
36. Add beforeinput event	13
37. text-security missing in list of features	12
38. Color Fonts including SVG-in-OT fonts	12
39. SVGZ-specific support table since iOS < 4.2 doesn't support it, but does support SVG. Not su...	12
40. I suggest support for TransferableObject types (of which there are several)	12
41. Async iterators / for await of	11
42. webcl?	11
43. Soft hyphen: html entity &shy;	11
44. New feature request: OCSP must-staple	10
45. Support for SVG's "shape-rendering" CSS property.	10
46. Add WebRTC insertable streams	10
47. Add Report-To API (Intervention Reports)	10
48. @font-face descriptors to override font metrics	10
49. queueMicrotask support	10
50. CSS Box Alignment Module Level 3	10
51. List support for the window.fetch keepalive option	9
52. Please add iFrame element contentWindow property	9
53. Add Webassembly Threads / Threaded Webassembly	9
54. Add float: footnote to CSS3	9
55. Cookies: max-age	9
56. Add Web Share Level 2	9
57. CSS3 Speech Module Which browsers support it? See	9
58. Include `baseline-shift` CSS property	9
59. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	9
60. Quota Management API	9
61. Show Support for JSON Modules	9
62. Track Intl.Segmenter	9
63. Add Web Share Target API	9
64. Add caniuse data for Contact Picker API	9
65. ElementInternals/form-associated custom element	9
66. webM alpha transparency	9
67. SVG viewport-fill property support	8
68. SVG viewport-fill-opacity property support	8
69. caniuse : Constructable Stylesheet	8
70. Add supported elliptical curves (HTTPS/TLS)	8
71. Add CSS animation timing function spring()	8
72. Badging API	8
73. Support CSS two-value display syntax	8
74. HTTP2 Server Push	8
75. Support for the frame-ancestors directive	7
76. RFC7692 Compression Extensions for WebSocket	7
77. 'imagesizes' & 'imagesrcset' for <link rel="preload">	7
78. Secure Cookie flag	7
79. input[autocomplete] (values besides on/off)	7
80. HTMLVideoElement.requestVideoFrameCallback()	7
81. Add support for the __Host- and __Secure-	7
82. Please add "isInputPending()"	7
83. Feature: Origin-bound one-time codes delivered via SMS	7
84. one-time-code	7
85. autocorrect for input fileds	7
86. Add `accent-color` property (CSS UI 4)	7
87. Add SVG `use` with external reference	7
88. WebGL extensions	7
89. User-Agent Client Hints (UA-CH)	7
90. Alt-Svc header browser support info: consider adding	7
91. This regards adding support for the navigator.userAgentData	7
92. Add `multipart/x-mixed-replace`	6
93. Tiff image format	6
94. WebCrypto Key Discovery	6
95. Flag storage that is not available under private mode	6
96. Module Worker support	6
97. Geofencing API	6
98. Add 'require-sri-for' CSP Directive	6
99. CSS 3 property: text-autospace and text-spacing	6
100. CSS tag {content: url()}	6
101. Cannot see |ImageCapture| entry in the web interface.	6
102. Add scroll-padding	6
103. HTML Modules	6
104. Add Web Share Target API Level 2	6
105. MediaStream Image Capture	6
106. Fetch Metadata Request Headers	6
107. Add `enterkeyhint` attribute ("Enter Key Hint")	6
108. New feature request: x25519 Key Exchange	6
109. Add Declarative Shadow DOM	6
110. Add ECC certificates	5
111. audio / video autoplay attribute and play function	5
112. Add support tables for document.documentElement.clientWidth	5
113. Observable	5
114. Page-margin boxes (@top-center, etc)	5
115. HTTP Strict Transport Security Preload	5
116. Please track the various HTTP Set-Cookie options supported by browsers	5
117. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
118. Add Eyedropper API to caniuse	5
119. Track support for navigator.getInstalledRelatedApps()	5
120. Embedded color profiles in JPEG images.	5
121. Feature: A Well-Known URL for Changing Passwords	5
122. Add `text-underline-offset` property	5
123. Bundled HTTP Exchanges	5
124. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
125. Support individual CSP rules	5
126. Add font-palette-values	5
127. Add autocorrect, autocapitalize, autocomplete attributes	5
128. -ms-overflow-style	5
129. Add isSecureContext feature to list	5
130. Accelerated Shape Detection in Images	5
131. Adding Khronos gITF 2.0 for 3D models	5
132. Screen Capture	4
133. Add `WebOTP` to list of apis	4
134. Add support for Trust Tokens API	4
135. [WebCryptoAPI] randomUUID	4
136. Support for Digital Goods API	4
137. Audio codec - xHE-AAC / USAC	4
138. Add Cookie Store API	4
139. Input Events Level 1 and 2	4
140. New top level domains (TLD)	4
141. Support the W3 Web Annotation standard (W3C Recommendation)	4
142. Arithmetic coded JPEG support	4
143. Add Versatile Video Coding (VVC) … somewhen	4
144. Add raw sockets API	4
145. Support aria-hidden html property	4
146. Add previousSibling and previousElementSibling	4
147. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	4
148. new CSS trigonometry functions	4
149. USDZ file format	4
150. Web locks	4
151. Payment Handler API	4
152. ::-webkit-file-upload-button	4
153. CSS Round Display	4
154. allowtransparency	4
155. CSS Shaders -	4
156. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
157. CSS image() functional notation (e.g. for background-images etc). See	4
158. Cache-Control	4
159. [CSS Level 4 pseudo-class] :user-error	4
160. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	4
161. display: table-caption?	3
162. Add `dynamic-range` media query	3
163. getTotalLength()	3
164. Add <data> element	3
165. add window-inactive pseudo-class	3
166. http://www.w3.org/TR/web-alarms/	3
167. Support for MHTML	3
168. Public class properties	3
169. Add Intl.DisplayNames	3
170. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	3
171. Add meta "format-detection"	3
172. <virtual-scroller>	3
173. Add System Colors item	3
174. JS Self-Profiling API	3
175. The !important css thing. It's very !important ;).	3
176. Add data for link rel="alternate"	3
177. ECMAscript - static properties	3
178. Add support for requestSubmit	3
179. CSS multicol data is mixed with fragmentation	3
180. ActiveX	3
181. place-items shorthand for justify and align	3
182. Support SVG width/height = auto	3
183. Adding Silverlight usage stats	3
184. Network Service Discovery	3
185. Private Click Measurement (PCM)	3
186. New browser feature: rest/spread in object literals	3
187. documentMode	3
188. Add Media Session API Coverage Information	3
189. Add support for addHitRegion	3
190. SVG sprites with <symbol> and <use>	3
191. Keyboard Lock	3
192. Grid-auto-flow	3
193. getEventListeners not listed	2
194. CanIUse OpenSearch	2
195. Add PNG cursor	2
196. support destructuring assignment as separate es feature	2
197. Basic Authentication: AuthName directive	2
198. SSML	2
199. Can I use X3D?	2
200. add csp lv2 violation event	2
201. add iframe.csp	2
202. SVG image auto height	2
203. Touch Icons (apple-touch-icon)	2
204. for ... of support data	2
205. add captureVisibleTab	2
206. add Accessibility Object Model	2
207. Add 'animated GIF as favicon'?	2
208. track support for the media query feature -ms-high-contrast	2
209. <input type=file>: ability to modify the selected files via JS	2
210. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
211. Why not suggests 'setPrototypeOf '	2
212. dns.resolve	2
213. Loading Signed Exchanges	2
214. Support of sms: and mms: in mobile browsers is not clear	2
215. <semantics> element in MathML is not found in caniuse.com	2
216. Add Geolocation Sensor	2
217. filename*=UTF-8''...	2
218. Add other values of `user-select` property	2
219. Add Integrated Windows Authentication	2
220. Add HTMLInputElement.select()	2
221. Add information on context-stroke and context-fill	2
222. UTF-8 Dingbats	2
223. Support KV Storage build-in module	2
224. Spatial Navigation support	2
225. Show ANSI escape code for console.log.	2
226. Storage Access API	2
227. "GeometryUtils" - part of the CSSOM. Provides much better position information than existi...	2
228. x-webkit-speech	2
229. justify-content: space-around	2
230. add "unicode property escapes"	2
231. [DOM API] `signal` option on EventTarget.protoype.addEventListener	2
232. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
233. EventTarget Constructor	2
234. Add information about CSS pseudo selector :defined	2
235. Add Sanitizer API	2
236. Please add ES3 support	2
237. Track adoption of DOMFrameContentLoaded event	2
238. Support for Canvas isPointInPath()	2
239. onerror event on iframe	2
240. Graphite font support	2
241. Add transitionstart event	2
242. Content-Security-Policy: block-all-mixed-content	2
243. Add browser support for toggle()	2
244. setTimeout and setInterval callback parameters	2
245. Device-Memory Client Hint & navigator.deviceMemory JS API	2
246. HTTP immutable responses	2
247. Support for CSS3 background-repeat-x and background-repeat-y properties	2
248. String.prototype.split() with a regex with grouping ( parentheses ).	2
249. srcset/sizes attribute / picture element support in SVG	2
250. CSS touch-action level 2 values	2
251. Add new SVG filter effects	2
252. External import maps	2
253. InputDeviceCapabilities API	2
254. Content-Security-Policy: script-nonce	2
255. Web bundles	2
256. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
257. Add `q` (quarter-millimeters) length unit	2
258. Add CSS @when/@else	2
259. SharedMemory/Atomics	2
260. Bitmap images inside SVG files. Some browsers that support SVG, will not show embedded bitmap image...	2
261. Add CSS module script/CSS modules	2
262. console.assert(boolean_expression)	2
263. getFilesAndDirectories	2
264. .getPointAtLength()	2
265. CSS page property (for printing)	2
266. SVG Foreign Object is a way to combine different XML namespaces elements into the SVG.	2
267. HTTP Trailers	2
268. Add information for the webcal and webcals protocols for subscribing to iCalendars	2
269. WebXR Hand Input Module - Level 1	2
270. Add CSS Properties and Values API	2
271. What about showing support for various link attributes, like "subresource" or "dns-pr...	2
272. MediaDevices.selectAudioOutput	2
273. Input type=email with "multiple" attribute	2
274. webkit-calendar-picker-indicator	1
275. Suggestion for caniuse.com: Which browsers.versions support multiple tbody elements in a single table?	1
276. Add desynchronized (low latency canvas contexts)	1
277. Can I use windowtext.	1
278. Can I Use m4a?	1
279. nested calc() and var()	1
280. @top-left @bottom-center ? can you test for compatibility	1
281. Window Placement API	1
282. voice-* properties aren't listed	1
283. Please add more detailed WebRTC features	1
284. roundRect	1
285. HTMLInputElement API: select support	1
286. iframe disallowdocumentaccess property	1
287. add RTSP and RTSP 2.0 (Real Time Streaming Protocol)	1
288. Add Support for MPEG-4 Part 2 SP/ASP	1
289. stroke-linecap support	1
290. grid-row-gap and grid-column-gap	1
291. stroke-linejoin support	1
292. script tag onerror attribute	1
293. performance.measureMemory()	1
294. Document Policies	1
295. Add the Javascript double asterisk power operator (**) to the list of supported features	1
296. create @Media Types	1
297. Add MathML Core	1
298. Add Scoped Styles aka. CSS Scoping	1
299. Request: nav-up, nav-down, nav-left, nav-right css3 properties	1
300. Add Text.wholeText property	1
301. device-pixel-content-box for ResizeObserver	1
302. Web intents/Web Activities	1
303. Add Container Units aka. Container Relative Lengths	1
304. Add ShadowRealm API	1
305. feature request: video/MP2T	1
306. Request: IPv6 proxy functions (myIpAddressEx and friends)	1
307. line-height support and the differences in rendering between webkit&trident and other engines.	1
308. `from-image` as initial value of `image-orientation`	1
309. Support for hrefTranslate	1
310. auto Picture-in-Picture	1
311. Add support information for font metric override descriptors	1
312. bidi algorithm (for right-to-left Unicode characters)	1
313. Clean up css-touch-action	1
314. Metadata name: HandheldFriendly	1
315. Metadata name: MobileOptimized	1
316. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	1
317. Support for XPath 2.0 (interesting for a lot of new functions, like base-uri(), matches() etc.)	1
318. The hanging-punctuation property: Currently unsupported by any browser, but it would be nice to ...	1
319. Add support for svg fill-rule	1
320. Streams API: transferable streams	1
321. Browser support for RTP streams?	1
322. requestPostAnimationFrame browser support?	1
323. column-break-after atm only via: -webkit-column-break-after	1
324. CMAF	1
325. css animation on “content:” - works on chrome, doesn't work on Safari and Firefox	1
326. E4X: ECMAScript for XML	1
327. Adding contain-intrinsic-size (suggestion)	1
328. MediaStream Recording (	1
329. accesskey attribute on non-focusable elements (should cause a click element to fire	1
330. Add URL Protocol Handler Registration for PWAs	1
331. Tracking various WebAuthn features	1
332. Textarea wrap attribute (off, soft, hard, virtual, physical)	1
333. <meta name="apple-mobile-web-app-capable" content="yes" />	1
334. Add: "color" and "background-color" CSS on <option> elements	1
335. I suggest adding information about support for alternate HTTP methods such as PUT and PATCH.	1
336. InsertKey Behaviour Overwrite/Normal Mode	1
337. Can you please add the Stack trace API that exists in V8	1
338. Add entry for DTLS 1.3	1
339. Add `::-webkit-details-marker`	1
340. Add Compression Stream API	1
341. Add CSS property `caret-shape` and shorthand `caret`	1
342. Intl.NumberFormat - notation (scientific, engineering, etc)	1
343. FLoC support	1
344. Show which browsers have a native CSV viewer	1
345. SameParty cookie attribute	1
346. x-webkit-airplay	1
347. Information about WavPack audio format	1
348. What is the browser support for the newly proposed "page-orientation" property?	1
349. missing HTTP TRACE method	1
350. Add layout-instability support	1
351. Add "specifying a color profile: the `@color-profile` at-rule"	1
352. image-resolution. I've seen this as a good alternative for retina images as opposed to backgro...	1
353. Add `media` attribute for `<meta>` element (for `<meta name="theme-color">`)	1
354. No information about the `unselectable` HTML attribute.	1
355. Missing feature: Clipboard API supported mimetypes	1
356. rel="ar" support	1
357. OfflineAudioContext	1
358. Input type=range with "multiple" attribute	1
359. Please add support for supported x509 extensions for ʜᴛᴛᴘꜱ certificates	1
360. URLSearchParams.prototype.sort	1
361. SVG symbols in CSS	1
362. Add HTTP_ORIGIN feature	1
363. document type	1
364. Add support for mediacapture-output API's sinkID	1
365. Add Range.getBoundingClientRect browser support table	1
366. Support XMLDocument	1
367. audio / video .canPlayType(MIMEtype)	1
368. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	1
369. DeviceOrientation and DeviceMotion events on insecure origins	1
370. Add "Controlling Font Display Per Font-Family via @font-feature-values"	1
371. Video media in image contexts	1
372. Audio Output Devices API: wd	1
373. Drag and Drop API - ghost image with customizable opacity	1
374. Add box-suppress	1
375. Drag and Drop API - move constraints	1
376. Add support for document.queryCommandState	1
377. Animating SVG paths using CSS	1
378. Support info for the <track> element	1
379. Chained selectors	1
380. Javascript pseudoprotocol	1
381. Add a footnote regarding HTMLAudioElement	1
382. aria-label	1
383. window.event	1
384. JS add oncuechange	1
385. [HTTP Header] Accept-CH-Lifetime	1
386. add CSS Extensions meant for renaming	1
387. Browser support for displaying the unicode block "Combining Diacritical Marks for Symbols"	1
388. request support for 'accept-charset'	1
389. Add app-region?	1
390. attachEvent event handler missing from CanIUse	1
391. Support data for Unicode flag on HTML pattern attribute	1
392. add "document.contentType"	1
393. SHA2 certificates	1
394. Missing a check for msConvertURL() on DragEvent	1
395. Support for nested calc expressions in CSS values	1
396. Add "Named function expressions"	1
397. Open search autodiscovery	1
398. add mouse event positions event.offsetX and event.offsetY	1
399. reflected-xss missing	1
400. column combination	1
401. Internationalized Domain Name	1
402. Add XSL to caniuse	1
403. Add support for CSS3 move-to property	1
404. CaretPosition missing	1
405. Missing `StorageQuota` support	1
406. string-set	1
407. CanvasRenderingContext2D.ellipse()	1
408. aria-labelledby	1
409. SHA1 certificates	1
410. Add support for HTTP header X-Permitted-Cross-Domain-Policies	1
411. Add support for the HTTP header X-Download-Options	1
412. add micropub	1
413. support data suggestion: DOM event constructors ?	1
414. [Suggestion] display: fullscreen	1
415. min/max-device-width/height	1
416. Add High Resolution Time Level 3	1
417. Add: Task Scheduler API Specification	1
418. Add css-timing	1
419. Suggestion: Int64 UInt64 (Firefox only AFAIK)	1
420. aria-current	1
421. add aria-required to caniuse, if not already there	1
422. Support for Unicode and spaces in URL	1
423. HTTP Content-encoding: LZFSE	1
424. MediaTrackConstraints	1
425. Use of es6 import statements in workers	1
426. Report Retry-After header support	1
427. Keyboard Map API	1
428. date.toLocaleString support tracking plz?	1
429. Add windows-theme media query selector	1
430. https mixed mode	1
431. Add page for relative path in HTTP Location	1
432. Add WebKit Tap Highlight Color (-webkit-tap-highlight-color)?	1
433. background-composite	1
434. event.path	1
435. add onstorage	1
436. Feature request: Token Binding Protocol	1
437. DownloadURL	1
438. IETF RFCs	1
439. CSS3 new text-transform keywords	1
440. Suggested addition: navigator.cpuClass	1
441. step property of input field with type datetime-local and time	1
442. please add the onsearch event	1
443. Add support for CSS clip property	1
444. supported-color-schemes & prefers-color-scheme	1
445. <object>.contentWindow Support	1
446. Support Data Suggestion: Clients API	1
447. CSS Inline Layout	1
448. Refresh	1
449. How to show support for font-variation-settings within @font-face?	1
450. The event handler window.onscroll is missing	1
451. longdesc attribute support	1
452. baseline-middle	1
453. Please add JavaScript string functions trimStart, trimEnd, trimRight, trimLeft	1
454. Support for calc() in polygon and other shapes	1
455. online/offline can also be used as events and are not covered by caniuse.com (only boolean property is covered)	1
456. Support for RegExp Named Capture Groups	1
457. IPv6 support in web browsers	1
458. user-modify	1
459. add ime-mode	1
460. Add CSS4 Grid structural selectors	1
461. Suggestion: support for margin-collapse?	1
462. Add `onpagehide` support data	1
463. Add: Tracking Preference Expression APIs	1
464. Add KeyboardEvent.repeat compatibility info	1
465. Missing computed property names	1
466. browserconfig.xml support info	1
467. [HTTP Header] Cross-Origin-Opener-Policy	1
468. Node.contains	1
469. Character-based alignment in a table column using text-align	1
470. Edge and IE don't support IndexedDB in web workers	1
471. Add support information for SVG's getIntersectionList	1
472. Please add support for getTimezoneOffset()	1
473. [Feature Policy: sub-feature] Sandbox features	1
474. Support for Service Worker Life Cycle Events	1
475. Add Object.prototype.watch method	1
476. support for HTMLTableElement.createTBody	1
477. window.watchMedia()	1
478. show support for namespacing; for example <svg: namespace	1
479. Add compatibility for FormData	1
480. The xml:space attribute	1
481. Add H2 ORIGIN frame support	1
482. Cannot find cancelBubble	1
483. ie behavior	1
484. window.localMediaStream is not listed	1
485. Add a matrix entyre for opentype-with-cff2	1
486. Please list support for event.eventPhase	1
487. Add checking for DataTransfer	1
488. VTTRegion is not found in caniuse	1
489. Global Privacy Control (GPC) "Sec-GPC" HTTP header	1