Suggestion	Votes
1. HTTP content-encoding: zstd	34
2. Suggestion: MediaRecorder.isTypeSupported supported types/codecs	29
3. Add support table for CSP 3.0 compliance	29
4. Add HTTP 103 Early Hints	29
5. Add WebCodecs API	29
6. css/svg property dominant-baseline	27
7. Add CSS Color Module Level 5 (color-mix(), color-contrast(), Relative color)	25
8. window.onerror - / - particularly mobile browser support	24
9. Add WebDriver	23
10. Can I use Reporting API	23
11. Entries for href values including `tel:1234567` and `sms:1234567`	22
12. Hyphenation Options	22
13. Add ES7/2016 SIMD	21
14. text-wrap	21
15. Track support for newly added spec: Dimensions (width/height) in <source> tags	20
16. WebExtensions (browser extensions)	19
17. Priority hints API	19
18. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	19
19. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	19
20. + WASM SIMD	19
21. WebTransport	19
22. XSLT Support table	19
23. JavaScript: Tail Call Support information missing	19
24. New feature: CSS Typed Object Model (CSS Typed OM)	17
25. Support constructible stylesheets / adoptedStyleSheets	17
26. TLS ECH (Encrypted Client Hello), formerly known as ESNI (Encrypted Server Name Indication)	17
27. Page Lifecycle API	16
28. device-cmyk css feature	16
29. Add CSS Grid Layout Module Level 3 (Masonry!)	16
30. border-corner-shape	15
31. Support Intrinsic Size Attribute	15
32. `content: leader('.');`	14
33. Add Media Queries Ranges	14
34. Geo URI scheme	13
35. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	13
36. Add beforeinput event	13
37. I suggest support for TransferableObject types (of which there are several)	12
38. input-security	12
39. Color Fonts including SVG-in-OT fonts	12
40. SVGZ-specific support table since iOS < 4.2 doesn't support it, but does support SVG. Not su...	12
41. webcl?	11
42. Async iterators / for await of	11
43. Soft hyphen: html entity &shy;	11
44. New feature request: OCSP must-staple	10
45. Add Report-To API (Intervention Reports)	10
46. CSS Box Alignment Module Level 3	10
47. queueMicrotask support	10
48. Add float: footnote to CSS3	10
49. Support for SVG's "shape-rendering" CSS property.	10
50. Add WebRTC insertable streams	10
51. @font-face descriptors to override font metrics	10
52. Track Intl.Segmenter	10
53. ElementInternals/form-associated custom element	10
54. List support for the window.fetch keepalive option	9
55. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	9
56. Add Web Share Target API	9
57. Add caniuse data for Contact Picker API	9
58. Quota Management API	9
59. Add Web Share Level 2	9
60. CSS3 Speech Module Which browsers support it? See	9
61. Cookies: max-age	9
62. Include `baseline-shift` CSS property	9
63. Add Webassembly Threads / Threaded Webassembly	9
64. webM alpha transparency	9
65. Show Support for JSON Modules	9
66. HTMLVideoElement.requestVideoFrameCallback()	8
67. SVG viewport-fill-opacity property support	8
68. SVG viewport-fill property support	8
69. Badging API	8
70. caniuse : Constructable Stylesheet	8
71. Support CSS two-value display syntax	8
72. one-time-code	8
73. Add supported elliptical curves (HTTPS/TLS)	8
74. HTTP2 Server Push	8
75. Add CSS animation timing function spring()	8
76. Add SVG `use` with external reference	7
77. input[autocomplete] (values besides on/off)	7
78. Secure Cookie flag	7
79. Alt-Svc header browser support info: consider adding	7
80. Add `accent-color` property (CSS UI 4)	7
81. This regards adding support for the navigator.userAgentData	7
82. WebGL extensions	7
83. Support for the frame-ancestors directive	7
84. Please add "isInputPending()"	7
85. RFC7692 Compression Extensions for WebSocket	7
86. Tiff image format	7
87. User-Agent Client Hints (UA-CH)	7
88. autocorrect for input fileds	7
89. Feature: Origin-bound one-time codes delivered via SMS	7
90. 'imagesizes' & 'imagesrcset' for <link rel="preload">	7
91. Module Worker support	6
92. Geofencing API	6
93. Add Web Share Target API Level 2	6
94. New feature request: x25519 Key Exchange	6
95. Flag storage that is not available under private mode	6
96. CSS tag {content: url()}	6
97. HTML Modules	6
98. Cannot see |ImageCapture| entry in the web interface.	6
99. CSS 3 property: text-autospace and text-spacing	6
100. Fetch Metadata Request Headers	6
101. Add 'require-sri-for' CSP Directive	6
102. Add Declarative Shadow DOM	6
103. Add `enterkeyhint` attribute ("Enter Key Hint")	6
104. Add scroll-padding	6
105. WebCrypto Key Discovery	6
106. Add `multipart/x-mixed-replace`	6
107. MediaStream Image Capture	6
108. Page-margin boxes (@top-center, etc)	6
109. Observable	5
110. Add Eyedropper API to caniuse	5
111. Adding Khronos gITF 2.0 for 3D models	5
112. Bundled HTTP Exchanges	5
113. USDZ file format	5
114. Add `text-underline-offset` property	5
115. Add `WebOTP` to list of apis	5
116. Add ECC certificates	5
117. Feature: A Well-Known URL for Changing Passwords	5
118. Please track the various HTTP Set-Cookie options supported by browsers	5
119. Support individual CSP rules	5
120. Add font-palette-values	5
121. [WebCryptoAPI] randomUUID	5
122. Add support tables for document.documentElement.clientWidth	5
123. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	5
124. Track support for navigator.getInstalledRelatedApps()	5
125. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
126. Accelerated Shape Detection in Images	5
127. -ms-overflow-style	5
128. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
129. Add autocorrect, autocapitalize, autocomplete attributes	5
130. HTTP Strict Transport Security Preload	5
131. audio / video autoplay attribute and play function	5
132. Embedded color profiles in JPEG images.	5
133. ::-webkit-file-upload-button	4
134. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	4
135. Add Versatile Video Coding (VVC) … somewhen	4
136. Add support for Trust Tokens API	4
137. CSS Round Display	4
138. Support the W3 Web Annotation standard (W3C Recommendation)	4
139. Input Events Level 1 and 2	4
140. Support for Digital Goods API	4
141. New top level domains (TLD)	4
142. Arithmetic coded JPEG support	4
143. Add previousSibling and previousElementSibling	4
144. Add raw sockets API	4
145. Support aria-hidden html property	4
146. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
147. Payment Handler API	4
148. JS Self-Profiling API	4
149. new CSS trigonometry functions	4
150. Web locks	4
151. Audio codec - xHE-AAC / USAC	4
152. Add Cookie Store API	4
153. [CSS Level 4 pseudo-class] :user-error	4
154. CSS image() functional notation (e.g. for background-images etc). See	4
155. CSS Shaders -	4
156. Screen Capture	4
157. allowtransparency	4
158. Cache-Control	4
159. Keyboard Lock	3
160. Add <data> element	3
161. Public class properties	3
162. Network Service Discovery	3
163. Grid-auto-flow	3
164. Add `dynamic-range` media query	3
165. The !important css thing. It's very !important ;).	3
166. add window-inactive pseudo-class	3
167. Add CSS module script/CSS modules	3
168. Add Media Session API Coverage Information	3
169. getEventListeners not listed	3
170. New browser feature: rest/spread in object literals	3
171. Adding Silverlight usage stats	3
172. CSS multicol data is mixed with fragmentation	3
173. place-items shorthand for justify and align	3
174. Support SVG width/height = auto	3
175. add Accessibility Object Model	3
176. Add System Colors item	3
177. Private Click Measurement (PCM)	3
178. Support for MHTML	3
179. <virtual-scroller>	3
180. http://www.w3.org/TR/web-alarms/	3
181. Add supports() queries on @import	3
182. getTotalLength()	3
183. Add meta "format-detection"	3
184. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	3
185. SVG sprites with <symbol> and <use>	3
186. Add support for addHitRegion	3
187. Can I Use m4a?	3
188. Add COLRv1	3
189. ActiveX	3
190. Add support for requestSubmit	3
191. ECMAscript - static properties	3
192. documentMode	3
193. Global Privacy Control (GPC) "Sec-GPC" HTTP header	3
194. display: table-caption?	3
195. Add Intl.DisplayNames	3
196. Bitmap images inside SVG files. Some browsers that support SVG, will not show embedded bitmap image...	2
197. SSML	2
198. Graphite font support	2
199. Add Sanitizer API	2
200. Add 'animated GIF as favicon'?	2
201. Support KV Storage build-in module	2
202. SharedMemory/Atomics	2
203. Add Integrated Windows Authentication	2
204. Add Geolocation Sensor	2
205. HTTP Trailers	2
206. MediaDevices.selectAudioOutput	2
207. <semantics> element in MathML is not found in caniuse.com	2
208. What about showing support for various link attributes, like "subresource" or "dns-pr...	2
209. WebXR Hand Input Module - Level 1	2
210. Add "outline follows border-radius"	2
211. [DOM API] `signal` option on EventTarget.protoype.addEventListener	2
212. Add other values of `user-select` property	2
213. track support for the media query feature -ms-high-contrast	2
214. CanIUse OpenSearch	2
215. Show ANSI escape code for console.log.	2
216. Touch Icons (apple-touch-icon)	2
217. add "unicode property escapes"	2
218. console.assert(boolean_expression)	2
219. support destructuring assignment as separate es feature	2
220. EventTarget Constructor	2
221. "GeometryUtils" - part of the CSSOM. Provides much better position information than existi...	2
222. Please add ES3 support	2
223. Add information about CSS pseudo selector :defined	2
224. Add information on context-stroke and context-fill	2
225. Storage Access API	2
226. x-webkit-speech	2
227. Track adoption of DOMFrameContentLoaded event	2
228. Add "Window Controls Overlay"	2
229. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
230. Spatial Navigation support	2
231. filename*=UTF-8''...	2
232. Add PNG cursor	2
233. dns.resolve	2
234. Add browser support for toggle()	2
235. SameParty cookie attribute	2
236. UTF-8 Dingbats	2
237. getFilesAndDirectories	2
238. add csp lv2 violation event	2
239. Can I use X3D?	2
240. External import maps	2
241. Content-Security-Policy: block-all-mixed-content	2
242. onerror event on iframe	2
243. setTimeout and setInterval callback parameters	2
244. Web bundles	2
245. Device-Memory Client Hint & navigator.deviceMemory JS API	2
246. srcset/sizes attribute / picture element support in SVG	2
247. HTTP immutable responses	2
248. Add CSS property `caret-shape` and shorthand `caret`	2
249. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
250. String.prototype.split() with a regex with grouping ( parentheses ).	2
251. Support for CSS3 background-repeat-x and background-repeat-y properties	2
252. Loading Signed Exchanges	2
253. Basic Authentication: AuthName directive	2
254. CSS touch-action level 2 values	2
255. Why not suggests 'setPrototypeOf '	2
256. justify-content: space-around	2
257. add iframe.csp	2
258. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
259. SVG image auto height	2
260. Content-Security-Policy: script-nonce	2
261. Missing feature: Clipboard API supported mimetypes	2
262. Support for Canvas isPointInPath()	2
263. add captureVisibleTab	2
264. Input type=email with "multiple" attribute	2
265. Add ShadowRealm API	2
266. Add information for the webcal and webcals protocols for subscribing to iCalendars	2
267. CSS page property (for printing)	2
268. Support of sms: and mms: in mobile browsers is not clear	2
269. grid-row-gap and grid-column-gap	1
270. rel="ar" support	1
271. Support for XPath 2.0 (interesting for a lot of new functions, like base-uri(), matches() etc.)	1
272. Adding contain-intrinsic-size (suggestion)	1
273. css animation on “content:” - works on chrome, doesn't work on Safari and Firefox	1
274. The hanging-punctuation property: Currently unsupported by any browser, but it would be nice to ...	1
275. accesskey attribute on non-focusable elements (should cause a click element to fire	1
276. CMAF	1
277. Information about WavPack audio format	1
278. <meta name="apple-mobile-web-app-capable" content="yes" />	1
279. InsertKey Behaviour Overwrite/Normal Mode	1
280. Add the Javascript double asterisk power operator (**) to the list of supported features	1
281. x-webkit-airplay	1
282. MediaStream Recording (	1
283. Add support for svg fill-rule	1
284. image-resolution. I've seen this as a good alternative for retina images as opposed to backgro...	1
285. What is the browser support for the newly proposed "page-orientation" property?	1
286. Add Compression Stream API	1
287. Add layout-instability support	1
288. Add support for mediacapture-output API's sinkID	1
289. Tracking various WebAuthn features	1
290. Add Scoped Styles aka. CSS Scoping	1
291. stroke-linecap support	1
292. add RTSP and RTSP 2.0 (Real Time Streaming Protocol)	1
293. Please add more detailed WebRTC features	1
294. voice-* properties aren't listed	1
295. Window Placement API	1
296. nested calc() and var()	1
297. Can I use windowtext.	1
298. roundRect	1
299. feature request: video/MP2T	1
300. line-height support and the differences in rendering between webkit&trident and other engines.	1
301. Add Container Units aka. Container Relative Lengths	1
302. Add MathML Core	1
303. Can you please add the Stack trace API that exists in V8	1
304. Add compatibility data for QuickTime video format	1
305. Add support for DNS RRs, like HTTPS and SVCB	1
306. Add Notification Triggers	1
307. Add CMYK Color Space	1
308. Add Web Neural Network (WebNN)	1
309. Add Wide Color Gamut in 2D Canvas	1
310. Add the `<model>` element	1
311. Add Date.prototype.toTemporalInstant()	1
312. Add oklab() and oklch()	1
313. Add font-palette	1
314. Add TPG image file format	1
315. Add CSS Custom Highlight API	1
316. stroke-linejoin support	1
317. Show which browsers have a native CSV viewer	1
318. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	1
319. No information about the `unselectable` HTML attribute.	1
320. webkit-calendar-picker-indicator	1
321. Streams API: transferable streams	1
322. iframe disallowdocumentaccess property	1
323. performance.measureMemory()	1
324. Web intents/Web Activities	1
325. `from-image` as initial value of `image-orientation`	1
326. auto Picture-in-Picture	1
327. Metadata name: HandheldFriendly	1
328. Metadata name: MobileOptimized	1
329. Support for hrefTranslate	1
330. device-pixel-content-box for ResizeObserver	1
331. Add support information for font metric override descriptors	1
332. Add entry for DTLS 1.3	1
333. Textarea wrap attribute (off, soft, hard, virtual, physical)	1
334. bidi algorithm (for right-to-left Unicode characters)	1
335. Add `::-webkit-details-marker`	1
336. Add: "color" and "background-color" CSS on <option> elements	1
337. Add URL Protocol Handler Registration for PWAs	1
338. requestPostAnimationFrame browser support?	1
339. Browser support for RTP streams?	1
340. I suggest adding information about support for alternate HTTP methods such as PUT and PATCH.	1
341. E4X: ECMAScript for XML	1
342. Add `media` attribute for `<meta>` element (for `<meta name="theme-color">`)	1
343. Add "specifying a color profile: the `@color-profile` at-rule"	1
344. missing HTTP TRACE method	1
345. FLoC support	1
346. DownloadURL	1
347. Add Support for MPEG-4 Part 2 SP/ASP	1
348. Video media in image contexts	1
349. Add High Resolution Time Level 3	1
350. Add: Task Scheduler API Specification	1
351. Add css-timing	1
352. aria-current	1
353. add aria-required to caniuse, if not already there	1
354. Add app-region?	1
355. URLSearchParams.prototype.sort	1
356. SVG symbols in CSS	1
357. add CSS Extensions meant for renaming	1
358. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	1
359. request support for 'accept-charset'	1
360. Add "Controlling Font Display Per Font-Family via @font-feature-values"	1
361. Please add support for supported x509 extensions for ʜᴛᴛᴘꜱ certificates	1
362. support data suggestion: DOM event constructors ?	1
363. Add CSS4 Grid structural selectors	1
364. Add KeyboardEvent.repeat compatibility info	1
365. browserconfig.xml support info	1
366. Edge and IE don't support IndexedDB in web workers	1
367. Chained selectors	1
368. Javascript pseudoprotocol	1
369. JS add oncuechange	1
370. Please add support for getTimezoneOffset()	1
371. [HTTP Header] Accept-CH-Lifetime	1
372. Add Object.prototype.watch method	1
373. show support for namespacing; for example <svg: namespace	1
374. Browser support for displaying the unicode block "Combining Diacritical Marks for Symbols"	1
375. The xml:space attribute	1
376. [Suggestion] display: fullscreen	1
377. add micropub	1
378. Support data for Unicode flag on HTML pattern attribute	1
379. event.path	1
380. Add Range.getBoundingClientRect browser support table	1
381. Add HTTP_ORIGIN feature	1
382. Add box-suppress	1
383. attachEvent event handler missing from CanIUse	1
384. string-set	1
385. Internationalized Domain Name	1
386. column combination	1
387. audio / video .canPlayType(MIMEtype)	1
388. DeviceOrientation and DeviceMotion events on insecure origins	1
389. SHA2 certificates	1
390. Audio Output Devices API: wd	1
391. Drag and Drop API - ghost image with customizable opacity	1
392. Drag and Drop API - move constraints	1
393. Add support for the HTTP header X-Download-Options	1
394. Add "Named function expressions"	1
395. Open search autodiscovery	1
396. add mouse event positions event.offsetX and event.offsetY	1
397. Animating SVG paths using CSS	1
398. reflected-xss missing	1
399. Support info for the <track> element	1
400. Add a footnote regarding HTMLAudioElement	1
401. Add XSL to caniuse	1
402. Add support for CSS3 move-to property	1
403. Missing `StorageQuota` support	1
404. aria-labelledby	1
405. SHA1 certificates	1
406. Add support for HTTP header X-Permitted-Cross-Domain-Policies	1
407. Support for Unicode and spaces in URL	1
408. HTTP Content-encoding: LZFSE	1
409. script tag onerror attribute	1
410. Input type=range with "multiple" attribute	1
411. IETF RFCs	1
412. OfflineAudioContext	1
413. document type	1
414. CSS Inline Layout	1
415. Use of es6 import statements in workers	1
416. CSS3 new text-transform keywords	1
417. step property of input field with type datetime-local and time	1
418. please add the onsearch event	1
419. Add support for CSS clip property	1
420. supported-color-schemes & prefers-color-scheme	1
421. <object>.contentWindow Support	1
422. longdesc attribute support	1
423. Refresh	1
424. https mixed mode	1
425. How to show support for font-variation-settings within @font-face?	1
426. Request: nav-up, nav-down, nav-left, nav-right css3 properties	1
427. The event handler window.onscroll is missing	1
428. baseline-middle	1
429. Please add JavaScript string functions trimStart, trimEnd, trimRight, trimLeft	1
430. Support for calc() in polygon and other shapes	1
431. create @Media Types	1
432. Suggestion for caniuse.com: Which browsers.versions support multiple tbody elements in a single table?	1
433. Request: IPv6 proxy functions (myIpAddressEx and friends)	1
434. Clean up css-touch-action	1
435. Document Policies	1
436. Add desynchronized (low latency canvas contexts)	1
437. @top-left @bottom-center ? can you test for compatibility	1
438. Add page for relative path in HTTP Location	1
439. Feature request: Token Binding Protocol	1
440. IPv6 support in web browsers	1
441. Add compatibility for FormData	1
442. add ime-mode	1
443. ie behavior	1
444. Suggestion: support for margin-collapse?	1
445. Add `onpagehide` support data	1
446. Add: Tracking Preference Expression APIs	1
447. Missing computed property names	1
448. window.localMediaStream is not listed	1
449. [HTTP Header] Cross-Origin-Opener-Policy	1
450. Character-based alignment in a table column using text-align	1
451. Add support information for SVG's getIntersectionList	1
452. user-modify	1
453. [Feature Policy: sub-feature] Sandbox features	1
454. window.watchMedia()	1
455. Add H2 ORIGIN frame support	1
456. date.toLocaleString support tracking plz?	1
457. Add windows-theme media query selector	1
458. Add WebKit Tap Highlight Color (-webkit-tap-highlight-color)?	1
459. Add a matrix entyre for opentype-with-cff2	1
460. Please list support for event.eventPhase	1
461. background-composite	1
462. VTTRegion is not found in caniuse	1
463. Support for Service Worker Life Cycle Events	1
464. Support for RegExp Named Capture Groups	1
465. Suggested addition: navigator.cpuClass	1
466. online/offline can also be used as events and are not covered by caniuse.com (only boolean property is covered)	1
467. Report Retry-After header support	1
468. Keyboard Map API	1
469. add onstorage	1
470. Add IPFS (Interplanetary File System) protocol to Caniuse	1