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