Suggestion	Votes
1. Add HTTP 103 Early Hints	54
2. css/svg property dominant-baseline	43
3. Suggestion: MediaRecorder.isTypeSupported supported types/codecs	38
4. + WASM SIMD	33
5. WebExtensions (browser extensions)	31
6. TLS ECH (Encrypted Client Hello), formerly known as ESNI (Encrypted Server Name Indication)	31
7. Entries for href values including `tel:1234567` and `sms:1234567`	31
8. Hyphenation Options	27
9. Add WebDriver	25
10. Can I use Reporting API	25
11. Add support for DNS RRs, like HTTPS and SVCB	25
12. Show Support for JSON Modules	24
13. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	24
14. Priority hints API	23
15. JavaScript: Tail Call Support information missing	22
16. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	21
17. XSLT Support table	21
18. Add ES7/2016 SIMD	21
19. New feature: CSS Typed Object Model (CSS Typed OM)	20
20. Add CSS property `caret-shape` and shorthand `caret`	20
21. Add CSS Grid Layout Module Level 3 (Masonry!)	20
22. device-cmyk css feature	19
23. External import maps	19
24. border-corner-shape	19
25. Support constructible stylesheets / adoptedStyleSheets	18
26. Add CSS `field-sizing` (previously `form-sizing`)	17
27. Page Lifecycle API	17
28. Geo URI scheme	16
29. Support Intrinsic Size Attribute	15
30. ElementInternals/form-associated custom element	15
31. `content: leader('.');`	15
32. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	14
33. Add Webassembly Threads / Threaded Webassembly	14
34. Add ShadowRealm API	14
35. SVGZ-specific support table since iOS < 4.2 doesn't support it, but does support SVG. Not su...	14
36. Color Fonts including SVG-in-OT fonts	13
37. Async iterators / for await of	13
38. Add the Popover API (ex: Pop Up API aka. the `popup` attribute plus more)	13
39. New feature request: OCSP must-staple	13
40. input-security	13
41. Native HTML Switches	13
42. I suggest support for TransferableObject types (of which there are several)	13
43. Support for SVG's "shape-rendering" CSS property.	12
44. Add Web Share Target API	12
45. Soft hyphen: html entity &shy;	12
46. Add caniuse data for Contact Picker API	11
47. CSS3 Speech Module Which browsers support it? See	11
48. Page-margin boxes (@top-center, etc)	11
49. Add WebRTC insertable streams	11
50. CSS Box Alignment Module Level 3	11
51. Add float: footnote to CSS3	11
52. Add the `<search>` element	11
53. Add the Quite OK Image Format (QOI) …maybe eventually	11
54. Add "outline follows border-radius"	11
55. webcl?	11
56. @font-face descriptors to override font metrics	10
57. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	10
58. Add: Webassembly Garbage Collection	10
59. Track Intl.Segmenter	10
60. Support CSS two-value display syntax	10
61. Badging API	10
62. Add CSS Custom Highlight API	10
63. SVG viewport-fill property support	10
64. queueMicrotask support	10
65. caniuse : Constructable Stylesheet	10
66. Add Web Share Level 2	10
67. one-time-code	10
68. Include `baseline-shift` CSS property	10
69. Add Report-To API (Intervention Reports)	10
70. webM alpha transparency	10
71. Cookies: max-age	9
72. Add SVG `use` with external reference	9
73. List support for the window.fetch keepalive option	9
74. HTTP2 Server Push	9
75. CSS 3 property: text-autospace and text-spacing	9
76. Add supported elliptical curves (HTTPS/TLS)	9
77. Add CSS animation timing function spring()	9
78. SVG viewport-fill-opacity property support	9
79. Add `WebOTP` to list of apis	9
80. Quota Management API	9
81. input[autocomplete] (values besides on/off)	8
82. Add support for @starting-style rule	8
83. Add Versatile Video Coding (VVC) … somewhen	8
84. Tiff image format	8
85. User-Agent Client Hints (UA-CH)	8
86. WebGL extensions	8
87. Add text-wrap: pretty	8
88. Alt-Svc header browser support info: consider adding	7
89. New feature request: x25519 Key Exchange	7
90. Add `WebSocketStream` API	7
91. HTML Modules	7
92. Please add "isInputPending()"	7
93. autocorrect for input fileds	7
94. Feature: Origin-bound one-time codes delivered via SMS	7
95. -ms-overflow-style	7
96. RFC7692 Compression Extensions for WebSocket	7
97. Add `multipart/x-mixed-replace`	7
98. Support for the frame-ancestors directive	7
99. Audio codec - xHE-AAC / USAC	7
100. Secure Cookie flag	7
101. This regards adding support for the navigator.userAgentData	7
102. Add support for Private State Tokens	7
103. WebCrypto Key Discovery	6
104. Add `enterkeyhint` attribute ("Enter Key Hint")	6
105. Module Worker support	6
106. Add tracking for Explicit Resource Management (`using` and `await using`)	6
107. Add "HDR AVIF" image support	6
108. Accelerated Shape Detection in Images	6
109. MediaStream Image Capture	6
110. Observable	6
111. Add System Colors item	6
112. Add ECC certificates	6
113. add Accessibility Object Model	6
114. USDZ file format	6
115. CSS tag {content: url()}	6
116. Add autocorrect, autocapitalize, autocomplete attributes	6
117. Cannot see |ImageCapture| entry in the web interface.	6
118. Add CSS Values and Units Module Level 4 Mathematical Expressions	6
119. Support for MHTML	6
120. Add Web Share Target API Level 2	6
121. Geofencing API	6
122. Embedded color profiles in JPEG images.	6
123. new CSS trigonometry functions	6
124. Flag storage that is not available under private mode	6
125. Add 'require-sri-for' CSP Directive	6
126. Window Placement API	6
127. Add the `:modal` pseudo-class	6
128. Bundled HTTP Exchanges	5
129. Add font-palette-values	5
130. Add support tables for document.documentElement.clientWidth	5
131. roundRect	5
132. Input Events Level 1 and 2	5
133. Support 'name' attribute on <details> ("Accordion pattern using name attribute on <details> elements")	5
134. Add HTTP method: QUERY	5
135. CSS Round Display	5
136. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	5
137. Add raw sockets API	5
138. Tracking various WebAuthn features	5
139. Global Privacy Control (GPC) "Sec-GPC" HTTP header	5
140. Adding Khronos gITF 2.0 for 3D models	5
141. JS Self-Profiling API	5
142. Add the `<model>` element	5
143. Support individual CSP rules	5
144. add window-inactive pseudo-class	5
145. CanIUse OpenSearch	5
146. Add supports() queries on @import	5
147. webp2 support	5
148. Add tracking for "Ultra HDR JPG"	5
149. Feature: A Well-Known URL for Changing Passwords	5
150. Add Fetch upload streaming	5
151. Payment Handler API	5
152. Popover API	5
153. Add Intl.DurationFormat	5
154. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
155. audio / video autoplay attribute and play function	5
156. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
157. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	5
158. HTTP Strict Transport Security Preload	5
159. CSS Shaders -	5
160. Please track the various HTTP Set-Cookie options supported by browsers	5
161. Input type=email with "multiple" attribute	5
162. Support for Digital Goods API	4
163. Screen Capture	4
164. Add Media Session API Coverage Information	4
165. Support the W3 Web Annotation standard (W3C Recommendation)	4
166. Add Cookie Store API	4
167. webkit-calendar-picker-indicator	4
168. Add Intl.DisplayNames	4
169. SVG sprites with <symbol> and <use>	4
170. New top level domains (TLD)	4
171. ::-webkit-file-upload-button	4
172. Add IPFS (Interplanetary File System) protocol to Caniuse	4
173. Accessibility of in-browser PDF Viewer	4
174. Add the HTML focusgroup attribute	4
175. Support aria-hidden html property	4
176. File Handling API	4
177. Add "page based counters"	4
178. Add meta "format-detection"	4
179. The !important css thing. It's very !important ;).	4
180. Add Local Font Access API	4
181. WebP & AVIF favicons	4
182. Cache-Control	4
183. filename*=UTF-8''...	4
184. SameParty cookie attribute	4
185. Graphite font support	4
186. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
187. Web locks	4
188. Support for Geometry Property (SVG 2.0) `r` in CSS	4
189. Support information for horizontal-viewport-segments and vertical-viewport-segments	4
190. Support SVG width/height = auto	4
191. [CSS Level 4 pseudo-class] :user-error	4
192. CSS image() functional notation (e.g. for background-images etc). See	4
193. Add Web Neural Network (WebNN)	4
194. Arithmetic coded JPEG support	4
195. Web bundles	3
196. Can I Use m4a?	3
197. Add 'animated GIF as favicon'?	3
198. Public class properties	3
199. Add "Window Controls Overlay"	3
200. Add gRPC support	3
201. Add Wide Color Gamut in 2D Canvas	3
202. CSS multicol data is mixed with fragmentation	3
203. getEventListeners not listed	3
204. Add support for requestSubmit	3
205. Content-Security-Policy: script-nonce	3
206. Add information for the webcal and webcals protocols for subscribing to iCalendars	3
207. display: table-caption?	3
208. Support new global attribute: writingsuggestions	3
209. Add support for iterator helpers	3
210. Support for CSS3 background-repeat-x and background-repeat-y properties	3
211. Add Invokers, currently `invoketarget` & `invokeaction`	3
212. Add "Responsive Video" aka. `media` attribute for `<source>` element in `<video>`	3
213. ECMAscript - static properties	3
214. Show ANSI escape code for console.log.	3
215. Private Click Measurement (PCM)	3
216. Add support for passwordrules input attribute	3
217. video codecs	3
218. CSS view-timeline supports	3
219. Missing feature: Clipboard API supported mimetypes	3
220. justify-content: space-around	3
221. documentMode	3
222. add iframe.csp	3
223. Add support for addHitRegion	3
224. New browser feature: rest/spread in object literals	3
225. Add `dynamic-range` media query	3
226. place-items shorthand for justify and align	3
227. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	3
228. Track adoption of DOMFrameContentLoaded event	2
229. <semantics> element in MathML is not found in caniuse.com	2
230. Add Geolocation Sensor	2
231. No information about the `unselectable` HTML attribute.	2
232. Add Integrated Windows Authentication	2
233. Support for hrefTranslate	2
234. Metadata name: MobileOptimized	2
235. Can I use X3D?	2
236. Add information on context-stroke and context-fill	2
237. Metadata name: HandheldFriendly	2
238. `from-image` as initial value of `image-orientation`	2
239. track support for the media query feature -ms-high-contrast	2
240. Basic Authentication: AuthName directive	2
241. rel="ar" support	2
242. x-webkit-speech	2
243. Add the Javascript double asterisk power operator (**) to the list of supported features	2
244. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	2
245. Add CSS4 Grid structural selectors	2
246. String.prototype.split() with a regex with grouping ( parentheses ).	2
247. WebXR Hand Input Module - Level 1	2
248. DNS-over-HTTPS (DoH)	2
249. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
250. Tooltip display on focus	2
251. Add auto-expand `<details>` for find-in-page and fragment navigations	2
252. Add block-step-size property for CSS	2
253. add secure payment confirmation (W3C)	2
254. Touch Icons (apple-touch-icon)	2
255. What about showing support for various link attributes, like "subresource" or "dns-pr...	2
256. Add "Scheduled Task API"	2
257. Bitmap images inside SVG files. Some browsers that support SVG, will not show embedded bitmap image...	2
258. Add browser support for toggle()	2
259. CSS word-break: 'auto-phrase' and 'manual'	2
260. Let's add a page for box alignment	2
261. Add "CICP in images"	2
262. [Request] Please add Web Assembly Garbage Collection (WasmGC)	2
263. text-space-collapse	2
264. A new page for Grid track animation should be added	2
265. Show which browsers have a native CSV viewer	2
266. Request: nav-up, nav-down, nav-left, nav-right css3 properties	2
267. stroke-linejoin support	2
268. add RTSP and RTSP 2.0 (Real Time Streaming Protocol)	2
269. Please add more detailed WebRTC features	2
270. Support of sms: and mms: in mobile browsers is not clear	2
271. Input type=range with "multiple" attribute	2
272. Add Container Units aka. Container Relative Lengths	2
273. Add CMYK Color Space	2
274. Add VisualViewport.segments support data	2
275. UTF-8 Dingbats	2
276. onerror event on iframe	2
277. Add TPG image file format	2
278. "GeometryUtils" - part of the CSSOM. Provides much better position information than existi...	2
279. Add server-timing as a trailer	2
280. Add chrome.webrequests	2
281. Add Date.prototype.toTemporalInstant()	2
282. support destructuring assignment as separate es feature	2
283. Video media in image contexts	2
284. Add support for HTTP header X-Permitted-Cross-Domain-Policies	2
285. SVG image auto height	2
286. Spatial Navigation support	2
287. CSS touch-action level 2 values	2
288. console.assert(boolean_expression)	2
289. add captureVisibleTab	2
290. Storage Access API	2
291. srcset/sizes attribute / picture element support in SVG	2
292. HTTP Trailers	2
293. EventTarget Constructor	2
294. SVG symbols in CSS	2
295. HTTP immutable responses	2
296. setTimeout and setInterval callback parameters	2
297. add "unicode property escapes"	2
298. Device-Memory Client Hint & navigator.deviceMemory JS API	2
299. add csp lv2 violation event	2
300. Drag and Drop API - ghost image with customizable opacity	2
301. Support KV Storage build-in module	2
302. SharedMemory/Atomics	2
303. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
304. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	2
305. SSML	2
306. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
307. Add HTTP_ORIGIN feature	2
308. Animating SVG paths using CSS	2
309. dns.resolve	2
310. getFilesAndDirectories	2
311. Add PNG cursor	2
312. Loading Signed Exchanges	2
313. accesskey attribute on non-focusable elements (should cause a click element to fire	1
314. Please add support for supported x509 extensions for ʜᴛᴛᴘꜱ certificates	1
315. WebSerial	1
316. viewport meta tag	1
317. Add support for CSS3 move-to property	1
318. Add `PWA file handlers`	1
319. Playback of videos with alpha channel	1
320. Web monetization	1
321. Add tech() function support (in @font-face src)	1
322. Missing `StorageQuota` support	1
323. CAA DNS record	1
324. SVG 2: inline-size property for text	1
325. Suggestion: @font-face src OpenType collection support	1
326. Add selection.getComposedRange() feature check	1
327. Add a footnote regarding HTMLAudioElement	1
328. Add Payment Request API 1.1	1
329. Add `target="_new"`	1
330. Add optional type syntax for JavaScript …maybe eventually	1
331. Add `Notification.prototype​.showTrigger️`	1
332. Browser support for displaying the unicode block "Combining Diacritical Marks for Symbols"	1
333. Add CSS Toggles …maybe eventually	1
334. sec-ch-prefers headers	1
335. Sec-Ch-wow64	1
336. image-resolution. I've seen this as a good alternative for retina images as opposed to backgro...	1
337. reflected-xss missing	1
338. Add Capture Handle	1
339. Add `font-variant-emoji`	1
340. Add CSS Scroll Snap Module Level 2	1
341. MediaStream Recording (	1
342. Add "method of opting into following the visual order", currently `focus-order` …maybe eventually	1
343. Add Background Blur API	1
344. Add Web MIDI 2.0 …maybe eventually	1
345. Javascript pseudoprotocol	1
346. Chained selectors	1
347. <meta name="apple-mobile-web-app-capable" content="yes" />	1
348. The hanging-punctuation property: Currently unsupported by any browser, but it would be nice to ...	1
349. import reflection for WASM	1
350. Add `blocking=render`	1
351. Add IndexedDB 3.0	1
352. Add XSL to caniuse	1
353. aria-labelledby	1
354. Support for XPath 2.0 (interesting for a lot of new functions, like base-uri(), matches() etc.)	1
355. View Transitions Module Level 2	1
356. X.509 Name Constraints	1
357. aria-current	1
358. viewport-fit	1
359. Browser support for Running elements	1
360. 32-bit HDR PNG	1
361. Please add TLS certificate algorithms to caniuse	1
362. mediacapture-region	1
363. prefers-reduced-transparency CSS Media Query	1
364. add micropub	1
365. Add css-timing	1
366. 'font-size' descriptor for '@font-face'	1
367. I suggest adding information about support for alternate HTTP methods such as PUT and PATCH.	1
368. Add High Resolution Time Level 3	1
369. Add Web Translation API …maybe eventually	1
370. Support for CSS Color Module Level 5	1
371. CSS property media-controls-panel	1
372. Add Web Preferences API …maybe eventually	1
373. [Suggestion] display: fullscreen	1
374. Snap Events: scrollsnapchange and scrollsnapchanging	1
375. X25519Kyber768 Hybrid Post-Quantum Key Exchange for HTTPS	1
376. Track the status of the JavaScript Promise Integration specification	1
377. Audio format: AC-3, eac3	1
378. add aria-required to caniuse, if not already there	1
379. Please add support data for "CSS property: clip-path: inset()". Thank you!	1
380. Add variable units	1
381. Add "Controlling Font Display Per Font-Family via @font-feature-values"	1
382. Add Gradient Interpolation Color Spaces	1
383. Add Change Array by Copy methods	1
384. Add WebDriver BiDi	1
385. Support HTJ2K	1
386. SHA1 certificates	1
387. Support Experimental "ES Pipe Operator (|>)"	1
388. Add URL.canParse()	1
389. Add `new Intl.DateTimeFormat().resolvedOptions().hour12`	1
390. Add tracking for ASTC hdr profile	1
391. Add Memory64 browser feature	1
392. Support of webkitAudioDecodedByteCount	1
393. Add `@font-feature-values`	1
394. Opus: Need data for MP4 and WebM containers	1
395. Textarea wrap attribute (off, soft, hard, virtual, physical)	1
396. Add "Scoped Custom Element Registry" as it is now behind an experimental feature flag in Chrome	1
397. URLSearchParams.prototype.sort	1
398. Content-Security-Policy: navigate-to	1
399. Add app-region?	1
400. Add support for the HTTP header X-Download-Options	1
401. Adding Managed Media Source	1
402. CSS generated images: Stripes	1
403. TLS Encrypted Client Hello (ECH)	1
404. IPv6 support in web browsers	1
405. add mouse event positions event.offsetX and event.offsetY	1
406. Streams API: transferable streams	1
407. CMAF	1
408. css animation on “content:” - works on chrome, doesn't work on Safari and Firefox	1
409. Adding contain-intrinsic-size (suggestion)	1
410. The xml:space attribute	1
411. please add the onsearch event	1
412. window.localMediaStream is not listed	1
413. step property of input field with type datetime-local and time	1
414. CSS3 new text-transform keywords	1
415. Use of es6 import statements in workers	1
416. line-height support and the differences in rendering between webkit&trident and other engines.	1
417. iframe disallowdocumentaccess property	1
418. Add support for svg fill-rule	1
419. performance.measureMemory()	1
420. Add windows-theme media query selector	1
421. support data suggestion: DOM event constructors ?	1
422. Add WebKit Tap Highlight Color (-webkit-tap-highlight-color)?	1
423. DownloadURL	1
424. auto Picture-in-Picture	1
425. Add Range.getBoundingClientRect browser support table	1
426. background-composite	1
427. OfflineAudioContext	1
428. document type	1
429. Add support information for font metric override descriptors	1
430. supported-color-schemes & prefers-color-scheme	1
431. show support for namespacing; for example <svg: namespace	1
432. Add page for relative path in HTTP Location	1
433. The event handler window.onscroll is missing	1
434. Support info for the <track> element	1
435. Support for calc() in polygon and other shapes	1
436. Clean up css-touch-action	1
437. Please add JavaScript string functions trimStart, trimEnd, trimRight, trimLeft	1
438. baseline-middle	1
439. Add desynchronized (low latency canvas contexts)	1
440. @top-left @bottom-center ? can you test for compatibility	1
441. add CSS Extensions meant for renaming	1
442. request support for 'accept-charset'	1
443. Add Support for MPEG-4 Part 2 SP/ASP	1
444. browserconfig.xml support info	1
445. DeviceOrientation and DeviceMotion events on insecure origins	1
446. How to show support for font-variation-settings within @font-face?	1
447. Refresh	1
448. Drag and Drop API - move constraints	1
449. Add Object.prototype.watch method	1
450. Audio Output Devices API: wd	1
451. x-webkit-airplay	1
452. What is the browser support for the newly proposed "page-orientation" property?	1
453. Add layout-instability support	1
454. <object>.contentWindow Support	1
455. Information about WavPack audio format	1
456. InsertKey Behaviour Overwrite/Normal Mode	1
457. add onstorage	1
458. https mixed mode	1
459. Support for Unicode and spaces in URL	1
460. Character-based alignment in a table column using text-align	1
461. feature request: video/MP2T	1
462. Add H2 ORIGIN frame support	1
463. Add compatibility for FormData	1
464. Add MathML Core	1
465. SHA2 certificates	1
466. Add compatibility data for QuickTime video format	1
467. window.watchMedia()	1
468. Add Notification Triggers	1
469. [Feature Policy: sub-feature] Sandbox features	1
470. create @Media Types	1
471. event.path	1
472. longdesc attribute support	1
473. Missing computed property names	1
474. Add: Tracking Preference Expression APIs	1
475. Suggestion for caniuse.com: Which browsers.versions support multiple tbody elements in a single table?	1
476. Suggestion: support for margin-collapse?	1
477. Add "Named function expressions"	1
478. Request: IPv6 proxy functions (myIpAddressEx and friends)	1
479. script tag onerror attribute	1
480. HTTP Content-encoding: LZFSE	1
481. Support data for Unicode flag on HTML pattern attribute	1
482. MPNG	1
483. Open search autodiscovery	1
484. column combination	1
485. Internationalized Domain Name	1
486. bidi algorithm (for right-to-left Unicode characters)	1
487. E4X: ECMAScript for XML	1
488. FLoC support	1
489. Feature request: Token Binding Protocol	1
490. IETF RFCs	1
491. Add `::-webkit-details-marker`	1
492. Add: "color" and "background-color" CSS on <option> elements	1
493. Add URL Protocol Handler Registration for PWAs	1
494. date.toLocaleString support tracking plz?	1
495. requestPostAnimationFrame browser support?	1
496. Add box-suppress	1
497. Report Retry-After header support	1
498. Add `media` attribute for `<meta>` element (for `<meta name="theme-color">`)	1
499. nested calc() and var()	1
500. Add "specifying a color profile: the `@color-profile` at-rule"	1
501. missing HTTP TRACE method	1
502. Add entry for DTLS 1.3	1
503. online/offline can also be used as events and are not covered by caniuse.com (only boolean property is covered)	1
504. Suggested addition: navigator.cpuClass	1
505. CSS Inline Layout	1
506. Can you please add the Stack trace API that exists in V8	1
507. Support for Service Worker Life Cycle Events	1
508. stroke-linecap support	1
509. string-set	1
510. Add a matrix entyre for opentype-with-cff2	1
511. Feature request: tc39 Explicit Resource Management	1