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