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