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