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. + WASM SIMD	33
5. Entries for href values including `tel:1234567` and `sms:1234567`	32
6. TLS ECH (Encrypted Client Hello), formerly known as ESNI (Encrypted Server Name Indication)	32
7. WebExtensions (browser extensions)	31
8. Add support for DNS RRs, like HTTPS and SVCB	30
9. Hyphenation Options	27
10. Can I use Reporting API	25
11. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	25
12. Add WebDriver	25
13. Show Support for JSON Modules	24
14. JavaScript: Tail Call Support information missing	23
15. Priority hints API	23
16. Add ES7/2016 SIMD	21
17. border-corner-shape	21
18. XSLT Support table	21
19. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	21
20. External import maps	21
21. Add CSS property `caret-shape` and shorthand `caret`	20
22. Add CSS Grid Layout Module Level 3 (Masonry!)	20
23. New feature: CSS Typed Object Model (CSS Typed OM)	20
24. Native HTML Switches	19
25. device-cmyk css feature	19
26. Add CSS `field-sizing` (previously `form-sizing`)	18
27. Support constructible stylesheets / adoptedStyleSheets	18
28. Page Lifecycle API	17
29. Geo URI scheme	16
30. Add ShadowRealm API	16
31. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	15
32. ElementInternals/form-associated custom element	15
33. `content: leader('.');`	15
34. Support Intrinsic Size Attribute	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. Add the Popover API (ex: Pop Up API aka. the `popup` attribute plus more)	13
38. New feature request: OCSP must-staple	13
39. Color Fonts including SVG-in-OT fonts	13
40. input-security	13
41. Async iterators / for await of	13
42. I suggest support for TransferableObject types (of which there are several)	13
43. Add Web Share Target API	12
44. Soft hyphen: html entity &shy;	12
45. Support for SVG's "shape-rendering" CSS property.	12
46. Add the `<search>` element	11
47. Add WebRTC insertable streams	11
48. Page-margin boxes (@top-center, etc)	11
49. Add float: footnote to CSS3	11
50. Add the Quite OK Image Format (QOI) …maybe eventually	11
51. Add "outline follows border-radius"	11
52. CSS Box Alignment Module Level 3	11
53. Add caniuse data for Contact Picker API	11
54. CSS3 Speech Module Which browsers support it? See	11
55. webcl?	11
56. webM alpha transparency	11
57. Add Web Share Level 2	10
58. Badging API	10
59. SVG viewport-fill property support	10
60. queueMicrotask support	10
61. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	10
62. one-time-code	10
63. Add CSS Custom Highlight API	10
64. @font-face descriptors to override font metrics	10
65. Add `WebOTP` to list of apis	10
66. Support CSS two-value display syntax	10
67. Track Intl.Segmenter	10
68. Add Report-To API (Intervention Reports)	10
69. Include `baseline-shift` CSS property	10
70. caniuse : Constructable Stylesheet	10
71. Add: Webassembly Garbage Collection	10
72. CSS 3 property: text-autospace and text-spacing	9
73. Cookies: max-age	9
74. Tiff image format	9
75. HTTP2 Server Push	9
76. Add supported elliptical curves (HTTPS/TLS)	9
77. Add CSS animation timing function spring()	9
78. Quota Management API	9
79. List support for the window.fetch keepalive option	9
80. Add SVG `use` with external reference	9
81. SVG viewport-fill-opacity property support	9
82. Add Versatile Video Coding (VVC) … somewhen	8
83. User-Agent Client Hints (UA-CH)	8
84. Add CSS property -- `object-view-box`	8
85. Add support for @starting-style rule	8
86. Add text-wrap: pretty	8
87. Add "HDR AVIF" image support	8
88. [Request] Please add Web Assembly Garbage Collection (WasmGC)	8
89. WebGL extensions	8
90. input[autocomplete] (values besides on/off)	8
91. Feature: Origin-bound one-time codes delivered via SMS	7
92. Add 'require-sri-for' CSP Directive	7
93. Please add "isInputPending()"	7
94. Secure Cookie flag	7
95. RFC7692 Compression Extensions for WebSocket	7
96. This regards adding support for the navigator.userAgentData	7
97. Audio codec - xHE-AAC / USAC	7
98. autocorrect for input fileds	7
99. Add support for Private State Tokens	7
100. New feature request: x25519 Key Exchange	7
101. Support for the frame-ancestors directive	7
102. -ms-overflow-style	7
103. HTML Modules	7
104. Add `multipart/x-mixed-replace`	7
105. Add `WebSocketStream` API	7
106. Alt-Svc header browser support info: consider adding	7
107. Cannot see |ImageCapture| entry in the web interface.	6
108. Add Web Share Target API Level 2	6
109. Add tracking for Explicit Resource Management (`using` and `await using`)	6
110. CSS tag {content: url()}	6
111. Add the `:modal` pseudo-class	6
112. new CSS trigonometry functions	6
113. Add Fetch upload streaming	6
114. Embedded color profiles in JPEG images.	6
115. Window Placement API	6
116. Add ECC certificates	6
117. Add Web Neural Network (WebNN)	6
118. add Accessibility Object Model	6
119. MediaStream Image Capture	6
120. Accelerated Shape Detection in Images	6
121. USDZ file format	6
122. Add `enterkeyhint` attribute ("Enter Key Hint")	6
123. Add System Colors item	6
124. CanIUse OpenSearch	6
125. Add support for iterator helpers	6
126. WebCrypto Key Discovery	6
127. Add autocorrect, autocapitalize, autocomplete attributes	6
128. Support for MHTML	6
129. Flag storage that is not available under private mode	6
130. Geofencing API	6
131. Module Worker support	6
132. Support 'name' attribute on <details> ("Accordion pattern using name attribute on <details> elements")	6
133. Observable	6
134. Add Intl.DurationFormat	5
135. CSS Round Display	5
136. Add raw sockets API	5
137. add window-inactive pseudo-class	5
138. Payment Handler API	5
139. Popover API	5
140. Add tracking for "Ultra HDR JPG"	5
141. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	5
142. Input Events Level 1 and 2	5
143. Adding Khronos gITF 2.0 for 3D models	5
144. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
145. Support individual CSP rules	5
146. Add CSS Values and Units Module Level 4 Mathematical Expressions	5
147. Global Privacy Control (GPC) "Sec-GPC" HTTP header	5
148. roundRect	5
149. CSS Shaders -	5
150. Add the `<model>` element	5
151. Add supports() queries on @import	5
152. webp2 support	5
153. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	5
154. Input type=email with "multiple" attribute	5
155. Add HTTP method: QUERY	5
156. JS Self-Profiling API	5
157. Tracking various WebAuthn features	5
158. HTTP Strict Transport Security Preload	5
159. Add support tables for document.documentElement.clientWidth	5
160. Add "page based counters"	5
161. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
162. Feature: A Well-Known URL for Changing Passwords	5
163. Please track the various HTTP Set-Cookie options supported by browsers	5
164. Add font-palette-values	5
165. Bundled HTTP Exchanges	5
166. audio / video autoplay attribute and play function	5
167. Add Incremental Font Transfer	5
168. Add Intl.DisplayNames	4
169. SameParty cookie attribute	4
170. Add IPFS (Interplanetary File System) protocol to Caniuse	4
171. Add meta "format-detection"	4
172. Add the HTML focusgroup attribute	4
173. Accessibility of in-browser PDF Viewer	4
174. Support aria-hidden html property	4
175. Support for Digital Goods API	4
176. Graphite font support	4
177. Screen Capture	4
178. Support information for horizontal-viewport-segments and vertical-viewport-segments	4
179. File Handling API	4
180. Add Local Font Access API	4
181. Add Cookie Store API	4
182. Web locks	4
183. webkit-calendar-picker-indicator	4
184. ::-webkit-file-upload-button	4
185. Snap Events: scrollsnapchange and scrollsnapchanging	4
186. Add Invokers, currently `invoketarget` & `invokeaction`	4
187. Support for Geometry Property (SVG 2.0) `r` in CSS	4
188. The !important css thing. It's very !important ;).	4
189. Support SVG width/height = auto	4
190. filename*=UTF-8''...	4
191. CSS image() functional notation (e.g. for background-images etc). See	4
192. documentMode	4
193. [CSS Level 4 pseudo-class] :user-error	4
194. New top level domains (TLD)	4
195. Arithmetic coded JPEG support	4
196. Add support for passwordrules input attribute	4
197. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
198. Support the W3 Web Annotation standard (W3C Recommendation)	4
199. WebP & AVIF favicons	4
200. SVG sprites with <symbol> and <use>	4
201. Add Media Session API Coverage Information	4
202. Cache-Control	4
203. CSS multicol data is mixed with fragmentation	3
204. Add "Responsive Video" aka. `media` attribute for `<source>` element in `<video>`	3
205. Add server-timing as a trailer	3
206. Add `dynamic-range` media query	3
207. display: table-caption?	3
208. Support new global attribute: writingsuggestions	3
209. Add "CICP in images"	3
210. Private Click Measurement (PCM)	3
211. Add support for HTTP header X-Permitted-Cross-Domain-Policies	3
212. No information about the `unselectable` HTML attribute.	3
213. Add information for the webcal and webcals protocols for subscribing to iCalendars	3
214. New browser feature: rest/spread in object literals	3
215. justify-content: space-around	3
216. CSS view-timeline supports	3
217. Add gRPC support	3
218. X25519Kyber768 Hybrid Post-Quantum Key Exchange for HTTPS	3
219. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	3
220. ECMAscript - static properties	3
221. Video media in image contexts	3
222. Add support for requestSubmit	3
223. Web bundles	3
224. Missing feature: Clipboard API supported mimetypes	3
225. place-items shorthand for justify and align	3
226. Content-Security-Policy: script-nonce	3
227. Can I Use m4a?	3
228. add iframe.csp	3
229. Public class properties	3
230. video codecs	3
231. Add Wide Color Gamut in 2D Canvas	3
232. Show ANSI escape code for console.log.	3
233. Add "Window Controls Overlay"	3
234. Support for CSS3 background-repeat-x and background-repeat-y properties	3
235. Add support for addHitRegion	3
236. getEventListeners not listed	3
237. Add 'animated GIF as favicon'?	3
238. Add CSS4 Grid structural selectors	2
239. Basic Authentication: AuthName directive	2
240. add secure payment confirmation (W3C)	2
241. rel="ar" support	2
242. Add the Javascript double asterisk power operator (**) to the list of supported features	2
243. Can I use X3D?	2
244. onerror event on iframe	2
245. Track adoption of DOMFrameContentLoaded event	2
246. CSS word-break: 'auto-phrase' and 'manual'	2
247. Animating SVG paths using CSS	2
248. HTTP Trailers	2
249. Add VisualViewport.segments support data	2
250. Drag and Drop API - ghost image with customizable opacity	2
251. Add information on context-stroke and context-fill	2
252. Add Integrated Windows Authentication	2
253. Let's add a page for box alignment	2
254. Input type=range with "multiple" attribute	2
255. x-webkit-speech	2
256. Add TPG image file format	2
257. Add CMYK Color Space	2
258. Add Container Units aka. Container Relative Lengths	2
259. Add browser support for toggle()	2
260. Bitmap images inside SVG files. Some browsers that support SVG, will not show embedded bitmap image...	2
261. What about showing support for various link attributes, like "subresource" or "dns-pr...	2
262. Please add more detailed WebRTC features	2
263. add RTSP and RTSP 2.0 (Real Time Streaming Protocol)	2
264. stroke-linejoin support	2
265. Touch Icons (apple-touch-icon)	2
266. Show which browsers have a native CSV viewer	2
267. Add Date.prototype.toTemporalInstant()	2
268. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
269. track support for the media query feature -ms-high-contrast	2
270. "GeometryUtils" - part of the CSSOM. Provides much better position information than existi...	2
271. UTF-8 Dingbats	2
272. WebXR Hand Input Module - Level 1	2
273. Request: nav-up, nav-down, nav-left, nav-right css3 properties	2
274. Support for hrefTranslate	2
275. Metadata name: MobileOptimized	2
276. Metadata name: HandheldFriendly	2
277. Support of sms: and mms: in mobile browsers is not clear	2
278. `from-image` as initial value of `image-orientation`	2
279. support destructuring assignment as separate es feature	2
280. Add chrome.webrequests	2
281. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	2
282. Add Geolocation Sensor	2
283. <semantics> element in MathML is not found in caniuse.com	2
284. CSS touch-action level 2 values	2
285. DNS-over-HTTPS (DoH)	2
286. Tooltip display on focus	2
287. SSML	2
288. Support KV Storage build-in module	2
289. HTTP immutable responses	2
290. EventTarget Constructor	2
291. IPv6 support in web browsers	2
292. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
293. Storage Access API	2
294. Add PNG cursor	2
295. String.prototype.split() with a regex with grouping ( parentheses ).	2
296. Spatial Navigation support	2
297. Support Experimental "ES Pipe Operator (|>)"	2
298. console.assert(boolean_expression)	2
299. srcset/sizes attribute / picture element support in SVG	2
300. Add auto-expand `<details>` for find-in-page and fragment navigations	2
301. add "unicode property escapes"	2
302. SharedMemory/Atomics	2
303. Add app-region?	2
304. text-space-collapse	2
305. Loading Signed Exchanges	2
306. dns.resolve	2
307. Add block-step-size property for CSS	2
308. Device-Memory Client Hint & navigator.deviceMemory JS API	2
309. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	2
310. getFilesAndDirectories	2
311. A new page for Grid track animation should be added	2
312. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
313. Add HTTP_ORIGIN feature	2
314. add captureVisibleTab	2
315. SVG symbols in CSS	2
316. SVG image auto height	2
317. add csp lv2 violation event	2
318. setTimeout and setInterval callback parameters	2
319. Add "Scheduled Task API"	2
320. Add CSS `@property`	1
321. Support for CSS Color Module Level 5	1
322. Suggestion: @font-face src OpenType collection support	1
323. MPNG	1
324. Web monetization	1
325. Add URL.canParse()	1
326. Add Web Translation API …maybe eventually	1
327. Add selection.getComposedRange() feature check	1
328. CSS property media-controls-panel	1
329. Please add support data for "CSS property: clip-path: inset()". Thank you!	1
330. CAA DNS record	1
331. Add Web Preferences API …maybe eventually	1
332. SVG 2: inline-size property for text	1
333. Add WebDriver BiDi	1
334. viewport meta tag	1
335. Track the status of the JavaScript Promise Integration specification	1
336. WebSerial	1
337. Add Change Array by Copy methods	1
338. Feature request: tc39 Explicit Resource Management	1
339. Add Gradient Interpolation Color Spaces	1
340. Adding Managed Media Source	1
341. Add tracking for ASTC hdr profile	1
342. Add `PWA file handlers`	1
343. Add "Scoped Custom Element Registry" as it is now behind an experimental feature flag in Chrome	1
344. Add CSS Toggles …maybe eventually	1
345. X.509 Name Constraints	1
346. sec-ch-prefers headers	1
347. Sec-Ch-wow64	1
348. Add Web MIDI 2.0 …maybe eventually	1
349. Audio format: AC-3, eac3	1
350. Add Background Blur API	1
351. 'font-size' descriptor for '@font-face'	1
352. viewport-fit	1
353. Add "method of opting into following the visual order", currently `focus-order` …maybe eventually	1
354. Add CSS Scroll Snap Module Level 2	1
355. Add `target="_new"`	1
356. Content-Security-Policy: navigate-to	1
357. Support of webkitAudioDecodedByteCount	1
358. Add `font-variant-emoji`	1
359. Add Capture Handle	1
360. CSS generated images: Stripes	1
361. Opus: Need data for MP4 and WebM containers	1
362. Browser support for Running elements	1
363. Add `new Intl.DateTimeFormat().resolvedOptions().hour12`	1
364. TLS Encrypted Client Hello (ECH)	1
365. Playback of videos with alpha channel	1
366. Add tech() function support (in @font-face src)	1
367. Add Payment Request API 1.1	1
368. Add variable units	1
369. Add IndexedDB 3.0	1
370. Add `blocking=render`	1
371. Support HTJ2K	1
372. import reflection for WASM	1
373. Add `@font-feature-values`	1
374. View Transitions Module Level 2	1
375. prefers-reduced-transparency CSS Media Query	1
376. mediacapture-region	1
377. Please add TLS certificate algorithms to caniuse	1
378. Add Memory64 browser feature	1
379. Add optional type syntax for JavaScript …maybe eventually	1
380. Add `Notification.prototype​.showTrigger️`	1
381. 32-bit HDR PNG	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