Suggestion	Votes
1. HTTP content-encoding: zstd	45
2. WebTransport	39
3. Add HTTP 103 Early Hints	37
4. Add WebCodecs API	37
5. css/svg property dominant-baseline	35
6. Add CSS Color Module Level 5 (color-mix(), color-contrast(), Relative color)	34
7. Add support table for CSP 3.0 compliance	32
8. Suggestion: MediaRecorder.isTypeSupported supported types/codecs	29
9. Entries for href values including `tel:1234567` and `sms:1234567`	26
10. Track support for newly added spec: Dimensions (width/height) in <source> tags	25
11. + WASM SIMD	25
12. window.onerror - / - particularly mobile browser support	24
13. Add WebDriver	23
14. Priority hints API	23
15. Can I use Reporting API	23
16. Hyphenation Options	23
17. text-wrap	23
18. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	22
19. Add ES7/2016 SIMD	21
20. Add customizable select element, currently `<selectmenu>`	20
21. XSLT Support table	19
22. New feature: CSS Typed Object Model (CSS Typed OM)	19
23. Show Support for JSON Modules	19
24. JavaScript: Tail Call Support information missing	19
25. WebExtensions (browser extensions)	19
26. TLS ECH (Encrypted Client Hello), formerly known as ESNI (Encrypted Server Name Indication)	19
27. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	19
28. Support constructible stylesheets / adoptedStyleSheets	18
29. Add CSS Grid Layout Module Level 3 (Masonry!)	17
30. border-corner-shape	16
31. device-cmyk css feature	16
32. Page Lifecycle API	16
33. Support Intrinsic Size Attribute	15
34. `content: leader('.');`	14
35. input-security	13
36. ElementInternals/form-associated custom element	13
37. I suggest support for TransferableObject types (of which there are several)	13
38. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	13
39. Geo URI scheme	13
40. Color Fonts including SVG-in-OT fonts	12
41. SVGZ-specific support table since iOS < 4.2 doesn't support it, but does support SVG. Not su...	12
42. Async iterators / for await of	12
43. New feature request: OCSP must-staple	11
44. webcl?	11
45. Add float: footnote to CSS3	11
46. Add WebRTC insertable streams	11
47. Soft hyphen: html entity &shy;	11
48. Add Webassembly Threads / Threaded Webassembly	11
49. Add Web Share Level 2	10
50. Add Report-To API (Intervention Reports)	10
51. Track Intl.Segmenter	10
52. one-time-code	10
53. Support for SVG's "shape-rendering" CSS property.	10
54. CSS Box Alignment Module Level 3	10
55. caniuse : Constructable Stylesheet	10
56. @font-face descriptors to override font metrics	10
57. queueMicrotask support	10
58. CSS3 Speech Module Which browsers support it? See	10
59. webM alpha transparency	9
60. Add caniuse data for Contact Picker API	9
61. List support for the window.fetch keepalive option	9
62. Add Web Share Target API	9
63. Include `baseline-shift` CSS property	9
64. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	9
65. Quota Management API	9
66. Support CSS two-value display syntax	9
67. Add CSS animation timing function spring()	9
68. Cookies: max-age	9
69. Add oklab() and oklch()	9
70. HTTP2 Server Push	8
71. HTMLVideoElement.requestVideoFrameCallback()	8
72. Badging API	8
73. Add `accent-color` property (CSS UI 4)	8
74. SVG viewport-fill-opacity property support	8
75. Add supported elliptical curves (HTTPS/TLS)	8
76. Add CSS property `caret-shape` and shorthand `caret`	8
77. WebGL extensions	8
78. SVG viewport-fill property support	8
79. Tiff image format	7
80. This regards adding support for the navigator.userAgentData	7
81. Secure Cookie flag	7
82. Add `WebOTP` to list of apis	7
83. Alt-Svc header browser support info: consider adding	7
84. Add ShadowRealm API	7
85. Feature: Origin-bound one-time codes delivered via SMS	7
86. Add SVG `use` with external reference	7
87. Support for the frame-ancestors directive	7
88. User-Agent Client Hints (UA-CH)	7
89. Please add "isInputPending()"	7
90. HTML Modules	7
91. autocorrect for input fileds	7
92. input[autocomplete] (values besides on/off)	7
93. RFC7692 Compression Extensions for WebSocket	7
94. Flag storage that is not available under private mode	6
95. Add Web Share Target API Level 2	6
96. CSS 3 property: text-autospace and text-spacing	6
97. Cannot see |ImageCapture| entry in the web interface.	6
98. CSS tag {content: url()}	6
99. Add support for Trust Tokens API	6
100. Add CSS module script/CSS modules	6
101. Accelerated Shape Detection in Images	6
102. Add `enterkeyhint` attribute ("Enter Key Hint")	6
103. Module Worker support	6
104. New feature request: x25519 Key Exchange	6
105. Add autocorrect, autocapitalize, autocomplete attributes	6
106. Add CSS Values and Units Module Level 4 Mathematical Expressions	6
107. Observable	6
108. MediaStream Image Capture	6
109. Add `multipart/x-mixed-replace`	6
110. WebCrypto Key Discovery	6
111. Geofencing API	6
112. Page-margin boxes (@top-center, etc)	6
113. Add 'require-sri-for' CSP Directive	6
114. roundRect	5
115. Add System Colors item	5
116. External import maps	5
117. Add Eyedropper API to caniuse	5
118. Adding Khronos gITF 2.0 for 3D models	5
119. Bundled HTTP Exchanges	5
120. Add ECC certificates	5
121. Please track the various HTTP Set-Cookie options supported by browsers	5
122. Add support tables for document.documentElement.clientWidth	5
123. Add Versatile Video Coding (VVC) … somewhen	5
124. Add the Quite OK Image Format (QOI) …maybe eventually	5
125. Add "outline follows border-radius"	5
126. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
127. Support individual CSP rules	5
128. USDZ file format	5
129. HTTP Strict Transport Security Preload	5
130. Audio codec - xHE-AAC / USAC	5
131. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	5
132. Embedded color profiles in JPEG images.	5
133. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
134. new CSS trigonometry functions	5
135. -ms-overflow-style	5
136. Feature: A Well-Known URL for Changing Passwords	5
137. [WebCryptoAPI] randomUUID	5
138. audio / video autoplay attribute and play function	5
139. Add font-palette-values	5
140. Add CSS Custom Highlight API	4
141. CSS Shaders -	4
142. Support for Digital Goods API	4
143. [CSS Level 4 pseudo-class] :user-error	4
144. Add the `:modal` pseudo-class	4
145. ::-webkit-file-upload-button	4
146. Screen Capture	4
147. Input Events Level 1 and 2	4
148. Window Placement API	4
149. Cache-Control	4
150. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	4
151. Add supports() queries on @import	4
152. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
153. Arithmetic coded JPEG support	4
154. add Accessibility Object Model	4
155. Add raw sockets API	4
156. Support the W3 Web Annotation standard (W3C Recommendation)	4
157. New top level domains (TLD)	4
158. Add the `<model>` element	4
159. Payment Handler API	4
160. The !important css thing. It's very !important ;).	4
161. Support for MHTML	4
162. Support aria-hidden html property	4
163. Global Privacy Control (GPC) "Sec-GPC" HTTP header	4
164. CSS Round Display	4
165. CSS image() functional notation (e.g. for background-images etc). See	4
166. allowtransparency	4
167. Web locks	4
168. JS Self-Profiling API	4
169. Add Cookie Store API	4
170. Add Intl.DisplayNames	3
171. add window-inactive pseudo-class	3
172. ECMAscript - static properties	3
173. Add `dynamic-range` media query	3
174. New browser feature: rest/spread in object literals	3
175. Add Media Session API Coverage Information	3
176. getEventListeners not listed	3
177. Add support for requestSubmit	3
178. Add meta "format-detection"	3
179. Public class properties	3
180. place-items shorthand for justify and align	3
181. Private Click Measurement (PCM)	3
182. Tracking various WebAuthn features	3
183. CanIUse OpenSearch	3
184. CSS multicol data is mixed with fragmentation	3
185. Add information for the webcal and webcals protocols for subscribing to iCalendars	3
186. display: table-caption?	3
187. Add <data> element	3
188. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	3
189. Accessibility of in-browser PDF Viewer	3
190. documentMode	3
191. getTotalLength()	3
192. Support SVG width/height = auto	3
193. Add support for DNS RRs, like HTTPS and SVCB	3
194. http://www.w3.org/TR/web-alarms/	3
195. SVG sprites with <symbol> and <use>	3
196. Can I Use m4a?	3
197. Add "fetchpriority"	3
198. Add support for addHitRegion	3
199. ActiveX	3
200. Support KV Storage build-in module	2
201. Support of sms: and mms: in mobile browsers is not clear	2
202. HTTP Trailers	2
203. Animating SVG paths using CSS	2
204. Loading Signed Exchanges	2
205. filename*=UTF-8''...	2
206. add "unicode property escapes"	2
207. Add other values of `user-select` property	2
208. Add Local Font Access API	2
209. File Handling API	2
210. Device-Memory Client Hint & navigator.deviceMemory JS API	2
211. x-webkit-speech	2
212. Add the HTML focusgroup attribute	2
213. MediaDevices.selectAudioOutput	2
214. Storage Access API	2
215. onerror event on iframe	2
216. Add chrome.webrequests	2
217. Can I use X3D?	2
218. Basic Authentication: AuthName directive	2
219. Add gRPC support	2
220. Graphite font support	2
221. Input type=email with "multiple" attribute	2
222. dns.resolve	2
223. webkit-calendar-picker-indicator	2
224. Please add ES3 support	2
225. Add Sanitizer API	2
226. Add browser support for toggle()	2
227. Missing feature: Clipboard API supported mimetypes	2
228. Bitmap images inside SVG files. Some browsers that support SVG, will not show embedded bitmap image...	2
229. track support for the media query feature -ms-high-contrast	2
230. What about showing support for various link attributes, like "subresource" or "dns-pr...	2
231. Touch Icons (apple-touch-icon)	2
232. Tooltip display on focus	2
233. rel="ar" support	2
234. justify-content: space-around	2
235. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
236. support destructuring assignment as separate es feature	2
237. "GeometryUtils" - part of the CSSOM. Provides much better position information than existi...	2
238. Show ANSI escape code for console.log.	2
239. UTF-8 Dingbats	2
240. Add information on context-stroke and context-fill	2
241. Add Integrated Windows Authentication	2
242. Add Geolocation Sensor	2
243. <semantics> element in MathML is not found in caniuse.com	2
244. A new page for Grid track animation should be added	2
245. Request: nav-up, nav-down, nav-left, nav-right css3 properties	2
246. Container Queries should be broken out into three pages	2
247. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
248. EventTarget Constructor	2
249. WebXR Hand Input Module - Level 1	2
250. webp2 support	2
251. Web bundles	2
252. Content-Security-Policy: script-nonce	2
253. SSML	2
254. Add PNG cursor	2
255. add iframe.csp	2
256. SVG image auto height	2
257. Add Scoped Styles aka. CSS Scoping	2
258. add captureVisibleTab	2
259. CSS touch-action level 2 values	2
260. CSS page property (for printing)	2
261. SharedMemory/Atomics	2
262. srcset/sizes attribute / picture element support in SVG	2
263. String.prototype.split() with a regex with grouping ( parentheses ).	2
264. SameParty cookie attribute	2
265. getFilesAndDirectories	2
266. Support for CSS3 background-repeat-x and background-repeat-y properties	2
267. HTTP immutable responses	2
268. stroke-linejoin support	2
269. setTimeout and setInterval callback parameters	2
270. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
271. add csp lv2 violation event	2
272. Track adoption of DOMFrameContentLoaded event	2
273. console.assert(boolean_expression)	2
274. Add TPG image file format	2
275. Add "Window Controls Overlay"	2
276. Spatial Navigation support	2
277. Add 'animated GIF as favicon'?	2
278. Add Wide Color Gamut in 2D Canvas	2
279. Add CSS Scroll Snap Module Level 2	1
280. bidi algorithm (for right-to-left Unicode characters)	1
281. nested calc() and var()	1
282. Add `font-variant-emoji`	1
283. Add entry for DTLS 1.3	1
284. Add `target="_new"`	1
285. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	1
286. css animation on “content:” - works on chrome, doesn't work on Safari and Firefox	1
287. Can I use windowtext.	1
288. Add "Scheduled Task API"	1
289. Streams API: transferable streams	1
290. text-space-collapse	1
291. Add Web MIDI 2.0 …maybe eventually	1
292. Show which browsers have a native CSV viewer	1
293. Add IPFS (Interplanetary File System) protocol to Caniuse	1
294. FLoC support	1
295. Can you please add the Stack trace API that exists in V8	1
296. Adding contain-intrinsic-size (suggestion)	1
297. Add IndexedDB 3.0	1
298. Add `blocking=render`	1
299. import reflection for WASM	1
300. Add `::-webkit-details-marker`	1
301. feature request: video/MP2T	1
302. stroke-linecap support	1
303. Add Fetch upload streaming	1
304. add RTSP and RTSP 2.0 (Real Time Streaming Protocol)	1
305. Add the Pop Up API aka. the `popup` attribute plus more	1
306. Please add more detailed WebRTC features	1
307. voice-* properties aren't listed	1
308. Add: "color" and "background-color" CSS on <option> elements	1
309. Add optional type syntax for JavaScript …maybe eventually	1
310. iframe disallowdocumentaccess property	1
311. device-pixel-content-box for ResizeObserver	1
312. Sec-Ch-wow64	1
313. Metadata name: MobileOptimized	1
314. sec-ch-prefers headers	1
315. Add MathML Core	1
316. Support for hrefTranslate	1
317. Add CSS Toggles …maybe eventually	1
318. TLS Encrypted Client Hello (ECH)	1
319. Support HTJ2K	1
320. Add compatibility data for QuickTime video format	1
321. E4X: ECMAScript for XML	1
322. Add "page based counters"	1
323. No information about the `unselectable` HTML attribute.	1
324. Add support information for font metric override descriptors	1
325. requestPostAnimationFrame browser support?	1
326. Support information for horizontal-viewport-segments and vertical-viewport-segments	1
327. Add `media` attribute for `<meta>` element (for `<meta name="theme-color">`)	1
328. MPNG	1
329. Add Web Neural Network (WebNN)	1
330. Add `Notification.prototype​.showTrigger️`	1
331. missing HTTP TRACE method	1
332. performance.measureMemory()	1
333. Add "specifying a color profile: the `@color-profile` at-rule"	1
334. Add URL Protocol Handler Registration for PWAs	1
335. Add Container Units aka. Container Relative Lengths	1
336. Add CMYK Color Space	1
337. Metadata name: HandheldFriendly	1
338. Add Capture Handle	1
339. Add server-timing as a trailer	1
340. Add Notification Triggers	1
341. `from-image` as initial value of `image-orientation`	1
342. Add VisualViewport.segments support data	1
343. auto Picture-in-Picture	1
344. Add Date.prototype.toTemporalInstant()	1
345. Add: Tracking Preference Expression APIs	1
346. CMAF	1
347. attachEvent event handler missing from CanIUse	1
348. add CSS Extensions meant for renaming	1
349. Add a footnote regarding HTMLAudioElement	1
350. Support info for the <track> element	1
351. Drag and Drop API - move constraints	1
352. Drag and Drop API - ghost image with customizable opacity	1
353. Audio Output Devices API: wd	1
354. DeviceOrientation and DeviceMotion events on insecure origins	1
355. audio / video .canPlayType(MIMEtype)	1
356. Add Range.getBoundingClientRect browser support table	1
357. Add support for mediacapture-output API's sinkID	1
358. document type	1
359. Add HTTP_ORIGIN feature	1
360. Add box-suppress	1
361. string-set	1
362. Add CSS4 Grid structural selectors	1
363. Internationalized Domain Name	1
364. column combination	1
365. SHA2 certificates	1
366. event.path	1
367. Add "Named function expressions"	1
368. Open search autodiscovery	1
369. add mouse event positions event.offsetX and event.offsetY	1
370. reflected-xss missing	1
371. Add XSL to caniuse	1
372. Add support for CSS3 move-to property	1
373. Missing `StorageQuota` support	1
374. aria-labelledby	1
375. SHA1 certificates	1
376. Add support for HTTP header X-Permitted-Cross-Domain-Policies	1
377. request support for 'accept-charset'	1
378. browserconfig.xml support info	1
379. add micropub	1
380. create @Media Types	1
381. line-height support and the differences in rendering between webkit&trident and other engines.	1
382. I suggest adding information about support for alternate HTTP methods such as PUT and PATCH.	1
383. Browser support for RTP streams?	1
384. Textarea wrap attribute (off, soft, hard, virtual, physical)	1
385. Web intents/Web Activities	1
386. Support for XPath 2.0 (interesting for a lot of new functions, like base-uri(), matches() etc.)	1
387. <meta name="apple-mobile-web-app-capable" content="yes" />	1
388. accesskey attribute on non-focusable elements (should cause a click element to fire	1
389. MediaStream Recording (	1
390. The hanging-punctuation property: Currently unsupported by any browser, but it would be nice to ...	1
391. image-resolution. I've seen this as a good alternative for retina images as opposed to backgro...	1
392. script tag onerror attribute	1
393. Suggestion for caniuse.com: Which browsers.versions support multiple tbody elements in a single table?	1
394. Input type=range with "multiple" attribute	1
395. Edge and IE don't support IndexedDB in web workers	1
396. longdesc attribute support	1
397. CSS Inline Layout	1
398. IETF RFCs	1
399. Feature request: Token Binding Protocol	1
400. add onstorage	1
401. background-composite	1
402. Add WebKit Tap Highlight Color (-webkit-tap-highlight-color)?	1
403. Add windows-theme media query selector	1
404. window.localMediaStream is not listed	1
405. ie behavior	1
406. The xml:space attribute	1
407. show support for namespacing; for example <svg: namespace	1
408. Add Object.prototype.watch method	1
409. Please add support for getTimezoneOffset()	1
410. Add support for the HTTP header X-Download-Options	1
411. support data suggestion: DOM event constructors ?	1
412. Add support for svg fill-rule	1
413. The event handler window.onscroll is missing	1
414. date.toLocaleString support tracking plz?	1
415. https mixed mode	1
416. Add page for relative path in HTTP Location	1
417. OfflineAudioContext	1
418. DownloadURL	1
419. Use of es6 import statements in workers	1
420. CSS3 new text-transform keywords	1
421. step property of input field with type datetime-local and time	1
422. please add the onsearch event	1
423. supported-color-schemes & prefers-color-scheme	1
424. <object>.contentWindow Support	1
425. Refresh	1
426. How to show support for font-variation-settings within @font-face?	1
427. baseline-middle	1
428. online/offline can also be used as events and are not covered by caniuse.com (only boolean property is covered)	1
429. Please add JavaScript string functions trimStart, trimEnd, trimRight, trimLeft	1
430. Support for calc() in polygon and other shapes	1
431. Request: IPv6 proxy functions (myIpAddressEx and friends)	1
432. Clean up css-touch-action	1
433. Add desynchronized (low latency canvas contexts)	1
434. @top-left @bottom-center ? can you test for compatibility	1
435. Add Support for MPEG-4 Part 2 SP/ASP	1
436. grid-row-gap and grid-column-gap	1
437. Add the Javascript double asterisk power operator (**) to the list of supported features	1
438. x-webkit-airplay	1
439. What is the browser support for the newly proposed "page-orientation" property?	1
440. Add layout-instability support	1
441. Information about WavPack audio format	1
442. InsertKey Behaviour Overwrite/Normal Mode	1
443. Report Retry-After header support	1
444. Suggested addition: navigator.cpuClass	1
445. [Suggestion] display: fullscreen	1
446. Javascript pseudoprotocol	1
447. Add High Resolution Time Level 3	1
448. Add: Task Scheduler API Specification	1
449. Add css-timing	1
450. aria-current	1
451. add aria-required to caniuse, if not already there	1
452. Add app-region?	1
453. URLSearchParams.prototype.sort	1
454. SVG symbols in CSS	1
455. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	1
456. Add "Controlling Font Display Per Font-Family via @font-feature-values"	1
457. Video media in image contexts	1
458. Please add support for supported x509 extensions for ʜᴛᴛᴘꜱ certificates	1
459. Chained selectors	1
460. Browser support for displaying the unicode block "Combining Diacritical Marks for Symbols"	1
461. Support for RegExp Named Capture Groups	1
462. Support for Unicode and spaces in URL	1
463. Support data for Unicode flag on HTML pattern attribute	1
464. HTTP Content-encoding: LZFSE	1
465. IPv6 support in web browsers	1
466. add ime-mode	1
467. Suggestion: support for margin-collapse?	1
468. Missing computed property names	1
469. Character-based alignment in a table column using text-align	1
470. [Feature Policy: sub-feature] Sandbox features	1
471. window.watchMedia()	1
472. Add compatibility for FormData	1
473. Add H2 ORIGIN frame support	1
474. Add a matrix entyre for opentype-with-cff2	1
475. Support for Service Worker Life Cycle Events	1
476. Add `WebSocketStream` API	1