Suggestion	Votes
1. Add HTTP 103 Early Hints	53
2. css/svg property dominant-baseline	43
3. Suggestion: MediaRecorder.isTypeSupported supported types/codecs	37
4. + WASM SIMD	33
5. Entries for href values including `tel:1234567` and `sms:1234567`	31
6. TLS ECH (Encrypted Client Hello), formerly known as ESNI (Encrypted Server Name Indication)	29
7. Hyphenation Options	27
8. Can I use Reporting API	25
9. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	24
10. Show Support for JSON Modules	24
11. Add WebDriver	24
12. Priority hints API	23
13. Add support for DNS RRs, like HTTPS and SVCB	22
14. JavaScript: Tail Call Support information missing	22
15. WebExtensions (browser extensions)	22
16. Add ES7/2016 SIMD	21
17. XSLT Support table	21
18. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	21
19. Add CSS property `caret-shape` and shorthand `caret`	20
20. New feature: CSS Typed Object Model (CSS Typed OM)	20
21. Add CSS Grid Layout Module Level 3 (Masonry!)	19
22. device-cmyk css feature	19
23. border-corner-shape	19
24. External import maps	18
25. Support constructible stylesheets / adoptedStyleSheets	18
26. Add CSS `field-sizing` (previously `form-sizing`)	17
27. Page Lifecycle API	17
28. Support Intrinsic Size Attribute	15
29. Geo URI scheme	15
30. ElementInternals/form-associated custom element	15
31. `content: leader('.');`	15
32. Add ShadowRealm API	14
33. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	14
34. Add Webassembly Threads / Threaded Webassembly	14
35. SVGZ-specific support table since iOS < 4.2 doesn't support it, but does support SVG. Not su...	14
36. I suggest support for TransferableObject types (of which there are several)	13
37. Add the Popover API (ex: Pop Up API aka. the `popup` attribute plus more)	13
38. Native HTML Switches	13
39. Async iterators / for await of	13
40. input-security	13
41. Add Web Share Target API	12
42. New feature request: OCSP must-staple	12
43. Support for SVG's "shape-rendering" CSS property.	12
44. Color Fonts including SVG-in-OT fonts	12
45. Soft hyphen: html entity &shy;	12
46. Add caniuse data for Contact Picker API	11
47. Add the Quite OK Image Format (QOI) …maybe eventually	11
48. Add WebRTC insertable streams	11
49. Add the `<search>` element	11
50. CSS Box Alignment Module Level 3	11
51. webcl?	11
52. Add "outline follows border-radius"	11
53. Add float: footnote to CSS3	11
54. CSS3 Speech Module Which browsers support it? See	11
55. Page-margin boxes (@top-center, etc)	11
56. Badging API	10
57. webM alpha transparency	10
58. one-time-code	10
59. queueMicrotask support	10
60. caniuse : Constructable Stylesheet	10
61. SVG viewport-fill property support	10
62. Support CSS two-value display syntax	10
63. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	10
64. Include `baseline-shift` CSS property	10
65. Track Intl.Segmenter	10
66. @font-face descriptors to override font metrics	10
67. Add Web Share Level 2	10
68. Add CSS Custom Highlight API	10
69. Add Report-To API (Intervention Reports)	10
70. Add SVG `use` with external reference	9
71. HTTP2 Server Push	9
72. List support for the window.fetch keepalive option	9
73. Cookies: max-age	9
74. CSS 3 property: text-autospace and text-spacing	9
75. Add CSS animation timing function spring()	9
76. Add supported elliptical curves (HTTPS/TLS)	9
77. SVG viewport-fill-opacity property support	9
78. Quota Management API	9
79. Add `WebOTP` to list of apis	9
80. User-Agent Client Hints (UA-CH)	8
81. Tiff image format	8
82. input[autocomplete] (values besides on/off)	8
83. Add text-wrap: pretty	8
84. WebGL extensions	8
85. Add support for @starting-style rule	8
86. Add Versatile Video Coding (VVC) … somewhen	8
87. HTML Modules	7
88. This regards adding support for the navigator.userAgentData	7
89. Audio codec - xHE-AAC / USAC	7
90. Add `WebSocketStream` API	7
91. RFC7692 Compression Extensions for WebSocket	7
92. Feature: Origin-bound one-time codes delivered via SMS	7
93. -ms-overflow-style	7
94. Add support for Private State Tokens	7
95. autocorrect for input fileds	7
96. New feature request: x25519 Key Exchange	7
97. Secure Cookie flag	7
98. Support for the frame-ancestors directive	7
99. Add `multipart/x-mixed-replace`	7
100. Alt-Svc header browser support info: consider adding	7
101. Please add "isInputPending()"	7
102. Add "HDR AVIF" image support	6
103. Accelerated Shape Detection in Images	6
104. Embedded color profiles in JPEG images.	6
105. Add CSS Values and Units Module Level 4 Mathematical Expressions	6
106. Module Worker support	6
107. MediaStream Image Capture	6
108. WebCrypto Key Discovery	6
109. Cannot see |ImageCapture| entry in the web interface.	6
110. CSS tag {content: url()}	6
111. CSS page property (for printing)	6
112. new CSS trigonometry functions	6
113. Add Web Share Target API Level 2	6
114. Add System Colors item	6
115. Add 'require-sri-for' CSP Directive	6
116. Add autocorrect, autocapitalize, autocomplete attributes	6
117. Observable	6
118. Window Placement API	6
119. Add the `:modal` pseudo-class	6
120. Add ECC certificates	6
121. add Accessibility Object Model	6
122. USDZ file format	6
123. Add `enterkeyhint` attribute ("Enter Key Hint")	6
124. Geofencing API	6
125. Support for MHTML	6
126. Flag storage that is not available under private mode	6
127. Add raw sockets API	5
128. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	5
129. roundRect	5
130. Input Events Level 1 and 2	5
131. add window-inactive pseudo-class	5
132. CSS Round Display	5
133. Adding Khronos gITF 2.0 for 3D models	5
134. Global Privacy Control (GPC) "Sec-GPC" HTTP header	5
135. JS Self-Profiling API	5
136. CanIUse OpenSearch	5
137. Tracking various WebAuthn features	5
138. Feature: A Well-Known URL for Changing Passwords	5
139. Add the `<model>` element	5
140. Add supports() queries on @import	5
141. webp2 support	5
142. Bundled HTTP Exchanges	5
143. Add font-palette-values	5
144. Support individual CSP rules	5
145. Popover API	5
146. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
147. Add support tables for document.documentElement.clientWidth	5
148. Add Intl.DurationFormat	5
149. Input type=email with "multiple" attribute	5
150. allowtransparency	5
151. Support 'name' attribute on <details> ("Accordion pattern using name attribute on <details> elements")	5
152. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
153. Please track the various HTTP Set-Cookie options supported by browsers	5
154. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	5
155. HTTP Strict Transport Security Preload	5
156. CSS Shaders -	5
157. Add: Webassembly Garbage Collection	5
158. audio / video autoplay attribute and play function	5
159. Add Fetch upload streaming	4
160. Support aria-hidden html property	4
161. Add "page based counters"	4
162. Support for Digital Goods API	4
163. Add Local Font Access API	4
164. Add Media Session API Coverage Information	4
165. New top level domains (TLD)	4
166. Payment Handler API	4
167. The !important css thing. It's very !important ;).	4
168. Support for Geometry Property (SVG 2.0) `r` in CSS	4
169. Web locks	4
170. Add tracking for "Ultra HDR JPG"	4
171. Graphite font support	4
172. [CSS Level 4 pseudo-class] :user-error	4
173. Screen Capture	4
174. ::-webkit-file-upload-button	4
175. Arithmetic coded JPEG support	4
176. Add Cookie Store API	4
177. SVG sprites with <symbol> and <use>	4
178. Support the W3 Web Annotation standard (W3C Recommendation)	4
179. Support SVG width/height = auto	4
180. Add Intl.DisplayNames	4
181. Add meta "format-detection"	4
182. SameParty cookie attribute	4
183. Add IPFS (Interplanetary File System) protocol to Caniuse	4
184. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
185. Cache-Control	4
186. Accessibility of in-browser PDF Viewer	4
187. filename*=UTF-8''...	4
188. CSS image() functional notation (e.g. for background-images etc). See	4
189. webkit-calendar-picker-indicator	4
190. File Handling API	4
191. Add the HTML focusgroup attribute	3
192. Private Click Measurement (PCM)	3
193. Support information for horizontal-viewport-segments and vertical-viewport-segments	3
194. Add "Window Controls Overlay"	3
195. Missing feature: Clipboard API supported mimetypes	3
196. Add `dynamic-range` media query	3
197. WebP & AVIF favicons	3
198. getEventListeners not listed	3
199. New browser feature: rest/spread in object literals	3
200. justify-content: space-around	3
201. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	3
202. Public class properties	3
203. Add "Responsive Video" aka. `media` attribute for `<source>` element in `<video>`	3
204. Add gRPC support	3
205. Show ANSI escape code for console.log.	3
206. Add support for requestSubmit	3
207. ECMAscript - static properties	3
208. Add Invokers, currently `invoketarget` & `invokeaction`	3
209. Add tracking for Explicit Resource Management (`using` and `await using`)	3
210. Add Wide Color Gamut in 2D Canvas	3
211. CSS multicol data is mixed with fragmentation	3
212. place-items shorthand for justify and align	3
213. video codecs	3
214. Can I Use m4a?	3
215. Web bundles	3
216. display: table-caption?	3
217. Add support for addHitRegion	3
218. Add 'animated GIF as favicon'?	3
219. Add information for the webcal and webcals protocols for subscribing to iCalendars	3
220. add iframe.csp	3
221. Add support for passwordrules input attribute	3
222. CSS view-timeline supports	3
223. Support for CSS3 background-repeat-x and background-repeat-y properties	3
224. documentMode	3
225. Content-Security-Policy: script-nonce	3
226. Add Geolocation Sensor	2
227. Add Integrated Windows Authentication	2
228. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
229. Add browser support for toggle()	2
230. <semantics> element in MathML is not found in caniuse.com	2
231. Add HTTP_ORIGIN feature	2
232. HTTP immutable responses	2
233. Bitmap images inside SVG files. Some browsers that support SVG, will not show embedded bitmap image...	2
234. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
235. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	2
236. Device-Memory Client Hint & navigator.deviceMemory JS API	2
237. setTimeout and setInterval callback parameters	2
238. dns.resolve	2
239. SVG symbols in CSS	2
240. Loading Signed Exchanges	2
241. Add chrome.webrequests	2
242. Add information on context-stroke and context-fill	2
243. CSS word-break: 'auto-phrase' and 'manual'	2
244. Add block-step-size property for CSS	2
245. Add support for HTTP header X-Permitted-Cross-Domain-Policies	2
246. Track adoption of DOMFrameContentLoaded event	2
247. CSS touch-action level 2 values	2
248. Add Web Neural Network (WebNN)	2
249. "GeometryUtils" - part of the CSSOM. Provides much better position information than existi...	2
250. Let's add a page for box alignment	2
251. Add Date.prototype.toTemporalInstant()	2
252. UTF-8 Dingbats	2
253. Add TPG image file format	2
254. track support for the media query feature -ms-high-contrast	2
255. Show which browsers have a native CSV viewer	2
256. Add server-timing as a trailer	2
257. rel="ar" support	2
258. srcset/sizes attribute / picture element support in SVG	2
259. Add the Javascript double asterisk power operator (**) to the list of supported features	2
260. String.prototype.split() with a regex with grouping ( parentheses ).	2
261. Request: nav-up, nav-down, nav-left, nav-right css3 properties	2
262. Input type=range with "multiple" attribute	2
263. add RTSP and RTSP 2.0 (Real Time Streaming Protocol)	2
264. Support of sms: and mms: in mobile browsers is not clear	2
265. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
266. Please add more detailed WebRTC features	2
267. add secure payment confirmation (W3C)	2
268. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	2
269. x-webkit-speech	2
270. Touch Icons (apple-touch-icon)	2
271. add "unicode property escapes"	2
272. Metadata name: MobileOptimized	2
273. Support for hrefTranslate	2
274. What about showing support for various link attributes, like "subresource" or "dns-pr...	2
275. add captureVisibleTab	2
276. Animating SVG paths using CSS	2
277. text-space-collapse	2
278. HTTP Trailers	2
279. Spatial Navigation support	2
280. SVG image auto height	2
281. getFilesAndDirectories	2
282. Drag and Drop API - ghost image with customizable opacity	2
283. WebXR Hand Input Module - Level 1	2
284. Tooltip display on focus	2
285. console.assert(boolean_expression)	2
286. add csp lv2 violation event	2
287. Add PNG cursor	2
288. DNS-over-HTTPS (DoH)	2
289. Add Container Units aka. Container Relative Lengths	2
290. SSML	2
291. onerror event on iframe	2
292. Metadata name: HandheldFriendly	2
293. Add "Scheduled Task API"	2
294. Add CSS4 Grid structural selectors	2
295. Add CMYK Color Space	2
296. Add support for iterator helpers	2
297. Support KV Storage build-in module	2
298. Video media in image contexts	2
299. stroke-linejoin support	2
300. Add auto-expand `<details>` for find-in-page and fragment navigations	2
301. Storage Access API	2
302. support destructuring assignment as separate es feature	2
303. SharedMemory/Atomics	2
304. `from-image` as initial value of `image-orientation`	2
305. A new page for Grid track animation should be added	2
306. Can I use X3D?	2
307. Add VisualViewport.segments support data	2
308. Basic Authentication: AuthName directive	2
309. EventTarget Constructor	2
310. 32-bit HDR PNG	1
311. mediacapture-region	1
312. nested calc() and var()	1
313. Add MathML Core	1
314. Please add TLS certificate algorithms to caniuse	1
315. View Transitions Module Level 2	1
316. Browser support for Running elements	1
317. Add compatibility data for QuickTime video format	1
318. Add Notification Triggers	1
319. prefers-reduced-transparency CSS Media Query	1
320. viewport-fit	1
321. feature request: video/MP2T	1
322. Add "Scoped Custom Element Registry" as it is now behind an experimental feature flag in Chrome	1
323. X.509 Name Constraints	1
324. Add Gradient Interpolation Color Spaces	1
325. import reflection for WASM	1
326. Add `blocking=render`	1
327. Add URL.canParse()	1
328. Add IndexedDB 3.0	1
329. Support Experimental "ES Pipe Operator (|>)"	1
330. Add WebDriver BiDi	1
331. Add Payment Request API 1.1	1
332. Add tech() function support (in @font-face src)	1
333. Add Change Array by Copy methods	1
334. Playback of videos with alpha channel	1
335. Add tracking for ASTC hdr profile	1
336. Add `PWA file handlers`	1
337. Please add support data for "CSS property: clip-path: inset()". Thank you!	1
338. Web monetization	1
339. Suggestion: @font-face src OpenType collection support	1
340. CAA DNS record	1
341. Add selection.getComposedRange() feature check	1
342. SVG 2: inline-size property for text	1
343. viewport meta tag	1
344. WebSerial	1
345. Add `new Intl.DateTimeFormat().resolvedOptions().hour12`	1
346. Add Web MIDI 2.0 …maybe eventually	1
347. Audio format: AC-3, eac3	1
348. Add CSS Toggles …maybe eventually	1
349. 'font-size' descriptor for '@font-face'	1
350. Support of webkitAudioDecodedByteCount	1
351. Adding Managed Media Source	1
352. MPNG	1
353. Content-Security-Policy: navigate-to	1
354. Support HTJ2K	1
355. TLS Encrypted Client Hello (ECH)	1
356. Add optional type syntax for JavaScript …maybe eventually	1
357. Add `Notification.prototype​.showTrigger️`	1
358. sec-ch-prefers headers	1
359. Add Background Blur API	1
360. Opus: Need data for MP4 and WebM containers	1
361. Sec-Ch-wow64	1
362. Add `@font-feature-values`	1
363. Add Capture Handle	1
364. Add `font-variant-emoji`	1
365. Add `target="_new"`	1
366. Add Memory64 browser feature	1
367. Add variable units	1
368. Add CSS Scroll Snap Module Level 2	1
369. Add "method of opting into following the visual order", currently `focus-order` …maybe eventually	1
370. stroke-linecap support	1
371. OfflineAudioContext	1
372. Can you please add the Stack trace API that exists in V8	1
373. Missing `StorageQuota` support	1
374. document type	1
375. Add box-suppress	1
376. string-set	1
377. Internationalized Domain Name	1
378. column combination	1
379. SHA2 certificates	1
380. event.path	1
381. Add "Named function expressions"	1
382. Open search autodiscovery	1
383. add mouse event positions event.offsetX and event.offsetY	1
384. reflected-xss missing	1
385. Add XSL to caniuse	1
386. Add support for CSS3 move-to property	1
387. aria-labelledby	1
388. DeviceOrientation and DeviceMotion events on insecure origins	1
389. SHA1 certificates	1
390. Add support for the HTTP header X-Download-Options	1
391. add micropub	1
392. support data suggestion: DOM event constructors ?	1
393. [Suggestion] display: fullscreen	1
394. Add High Resolution Time Level 3	1
395. Add css-timing	1
396. aria-current	1
397. add aria-required to caniuse, if not already there	1
398. Add app-region?	1
399. URLSearchParams.prototype.sort	1
400. Add "Controlling Font Display Per Font-Family via @font-feature-values"	1
401. Please add support for supported x509 extensions for ʜᴛᴛᴘꜱ certificates	1
402. Chained selectors	1
403. Add Range.getBoundingClientRect browser support table	1
404. Audio Output Devices API: wd	1
405. Browser support for displaying the unicode block "Combining Diacritical Marks for Symbols"	1
406. CSS Inline Layout	1
407. I suggest adding information about support for alternate HTTP methods such as PUT and PATCH.	1
408. Textarea wrap attribute (off, soft, hard, virtual, physical)	1
409. Web intents/Web Activities	1
410. Support for XPath 2.0 (interesting for a lot of new functions, like base-uri(), matches() etc.)	1
411. <meta name="apple-mobile-web-app-capable" content="yes" />	1
412. accesskey attribute on non-focusable elements (should cause a click element to fire	1
413. MediaStream Recording (	1
414. The hanging-punctuation property: Currently unsupported by any browser, but it would be nice to ...	1
415. image-resolution. I've seen this as a good alternative for retina images as opposed to backgro...	1
416. script tag onerror attribute	1
417. Suggestion for caniuse.com: Which browsers.versions support multiple tbody elements in a single table?	1
418. create @Media Types	1
419. longdesc attribute support	1
420. IETF RFCs	1
421. Drag and Drop API - move constraints	1
422. Feature request: Token Binding Protocol	1
423. add onstorage	1
424. background-composite	1
425. Add WebKit Tap Highlight Color (-webkit-tap-highlight-color)?	1
426. Add windows-theme media query selector	1
427. window.localMediaStream is not listed	1
428. The xml:space attribute	1
429. show support for namespacing; for example <svg: namespace	1
430. Add Object.prototype.watch method	1
431. browserconfig.xml support info	1
432. request support for 'accept-charset'	1
433. add CSS Extensions meant for renaming	1
434. Add a footnote regarding HTMLAudioElement	1
435. Support info for the <track> element	1
436. Javascript pseudoprotocol	1
437. Support for Unicode and spaces in URL	1
438. Add entry for DTLS 1.3	1
439. Streams API: transferable streams	1
440. Clean up css-touch-action	1
441. Add desynchronized (low latency canvas contexts)	1
442. @top-left @bottom-center ? can you test for compatibility	1
443. Add Support for MPEG-4 Part 2 SP/ASP	1
444. x-webkit-airplay	1
445. What is the browser support for the newly proposed "page-orientation" property?	1
446. Add layout-instability support	1
447. Information about WavPack audio format	1
448. InsertKey Behaviour Overwrite/Normal Mode	1
449. Add support for svg fill-rule	1
450. CMAF	1
451. css animation on “content:” - works on chrome, doesn't work on Safari and Firefox	1
452. Adding contain-intrinsic-size (suggestion)	1
453. iframe disallowdocumentaccess property	1
454. Support for calc() in polygon and other shapes	1
455. performance.measureMemory()	1
456. auto Picture-in-Picture	1
457. No information about the `unselectable` HTML attribute.	1
458. Add support information for font metric override descriptors	1
459. bidi algorithm (for right-to-left Unicode characters)	1
460. FLoC support	1
461. Add `::-webkit-details-marker`	1
462. Add: "color" and "background-color" CSS on <option> elements	1
463. Add URL Protocol Handler Registration for PWAs	1
464. requestPostAnimationFrame browser support?	1
465. E4X: ECMAScript for XML	1
466. Add `media` attribute for `<meta>` element (for `<meta name="theme-color">`)	1
467. Add "specifying a color profile: the `@color-profile` at-rule"	1
468. missing HTTP TRACE method	1
469. Request: IPv6 proxy functions (myIpAddressEx and friends)	1
470. Please add JavaScript string functions trimStart, trimEnd, trimRight, trimLeft	1
471. Support data for Unicode flag on HTML pattern attribute	1
472. online/offline can also be used as events and are not covered by caniuse.com (only boolean property is covered)	1
473. HTTP Content-encoding: LZFSE	1
474. IPv6 support in web browsers	1
475. Suggestion: support for margin-collapse?	1
476. Add: Tracking Preference Expression APIs	1
477. Missing computed property names	1
478. Character-based alignment in a table column using text-align	1
479. [Feature Policy: sub-feature] Sandbox features	1
480. window.watchMedia()	1
481. Add compatibility for FormData	1
482. Add H2 ORIGIN frame support	1
483. Add a matrix entyre for opentype-with-cff2	1
484. Support for Service Worker Life Cycle Events	1
485. Suggested addition: navigator.cpuClass	1
486. Report Retry-After header support	1
487. baseline-middle	1
488. date.toLocaleString support tracking plz?	1
489. https mixed mode	1
490. Add page for relative path in HTTP Location	1
491. line-height support and the differences in rendering between webkit&trident and other engines.	1
492. DownloadURL	1
493. Use of es6 import statements in workers	1
494. CSS3 new text-transform keywords	1
495. step property of input field with type datetime-local and time	1
496. please add the onsearch event	1
497. supported-color-schemes & prefers-color-scheme	1
498. <object>.contentWindow Support	1
499. Refresh	1
500. How to show support for font-variation-settings within @font-face?	1
501. The event handler window.onscroll is missing	1
502. Add "CICP in images"	1