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