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. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	26
12. Can I use Reporting API	25
13. Show Support for JSON Modules	24
14. JavaScript: Tail Call Support information missing	23
15. Priority hints API	23
16. XSLT Support table	21
17. Add ES7/2016 SIMD	21
18. External import maps	21
19. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	21
20. border-corner-shape	21
21. New feature: CSS Typed Object Model (CSS Typed OM)	20
22. Add CSS property `caret-shape` and shorthand `caret`	20
23. Add CSS Grid Layout Module Level 3 (Masonry!)	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. Add ShadowRealm API	16
30. Geo URI scheme	16
31. `content: leader('.');`	15
32. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	15
33. SVGZ-specific support table since iOS < 4.2 doesn't support it, but does support SVG. Not su...	15
34. ElementInternals/form-associated custom element	15
35. Support Intrinsic Size Attribute	15
36. Add Webassembly Threads / Threaded Webassembly	14
37. Color Fonts including SVG-in-OT fonts	13
38. input-security	13
39. New feature request: OCSP must-staple	13
40. Add the Popover API (ex: Pop Up API aka. the `popup` attribute plus more)	13
41. Async iterators / for await of	13
42. I suggest support for TransferableObject types (of which there are several)	13
43. Support for SVG's "shape-rendering" CSS property.	12
44. Soft hyphen: html entity &shy;	12
45. Page-margin boxes (@top-center, etc)	12
46. Add Web Share Target API	12
47. webcl?	11
48. Add WebRTC insertable streams	11
49. Add the `<search>` element	11
50. Add "outline follows border-radius"	11
51. CSS Box Alignment Module Level 3	11
52. Add float: footnote to CSS3	11
53. Add the Quite OK Image Format (QOI) …maybe eventually	11
54. Add caniuse data for Contact Picker API	11
55. CSS3 Speech Module Which browsers support it? See	11
56. webM alpha transparency	11
57. one-time-code	10
58. SVG viewport-fill property support	10
59. Add Web Share Level 2	10
60. queueMicrotask support	10
61. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	10
62. @font-face descriptors to override font metrics	10
63. Add Report-To API (Intervention Reports)	10
64. Badging API	10
65. Track Intl.Segmenter	10
66. Add CSS Custom Highlight API	10
67. Add: Webassembly Garbage Collection	10
68. Add `WebOTP` to list of apis	10
69. Support CSS two-value display syntax	10
70. Include `baseline-shift` CSS property	10
71. caniuse : Constructable Stylesheet	10
72. List support for the window.fetch keepalive option	9
73. Add CSS animation timing function spring()	9
74. HTTP2 Server Push	9
75. Tiff image format	9
76. Cookies: max-age	9
77. CSS 3 property: text-autospace and text-spacing	9
78. Add supported elliptical curves (HTTPS/TLS)	9
79. Add SVG `use` with external reference	9
80. SVG viewport-fill-opacity property support	9
81. [Request] Please add Web Assembly Garbage Collection (WasmGC)	9
82. Quota Management API	9
83. Add support for @starting-style rule	8
84. Add Versatile Video Coding (VVC) … somewhen	8
85. User-Agent Client Hints (UA-CH)	8
86. Add CSS property -- `object-view-box`	8
87. Add "HDR AVIF" image support	8
88. Add text-wrap: pretty	8
89. WebGL extensions	8
90. input[autocomplete] (values besides on/off)	8
91. Add `WebSocketStream` API	7
92. Add 'require-sri-for' CSP Directive	7
93. Please add "isInputPending()"	7
94. Audio codec - xHE-AAC / USAC	7
95. Add Fetch upload streaming	7
96. autocorrect for input fileds	7
97. Add support for Private State Tokens	7
98. HTML Modules	7
99. RFC7692 Compression Extensions for WebSocket	7
100. Feature: Origin-bound one-time codes delivered via SMS	7
101. Alt-Svc header browser support info: consider adding	7
102. -ms-overflow-style	7
103. Secure Cookie flag	7
104. Support for the frame-ancestors directive	7
105. Add `multipart/x-mixed-replace`	7
106. New feature request: x25519 Key Exchange	7
107. This regards adding support for the navigator.userAgentData	7
108. Module Worker support	6
109. MediaStream Image Capture	6
110. Observable	6
111. Accelerated Shape Detection in Images	6
112. Add System Colors item	6
113. USDZ file format	6
114. Add ECC certificates	6
115. Add Web Share Target API Level 2	6
116. add Accessibility Object Model	6
117. CSS tag {content: url()}	6
118. Add the `:modal` pseudo-class	6
119. new CSS trigonometry functions	6
120. WebCrypto Key Discovery	6
121. Add autocorrect, autocapitalize, autocomplete attributes	6
122. Cannot see |ImageCapture| entry in the web interface.	6
123. Window Placement API	6
124. Embedded color profiles in JPEG images.	6
125. Add `enterkeyhint` attribute ("Enter Key Hint")	6
126. CanIUse OpenSearch	6
127. Support for MHTML	6
128. Flag storage that is not available under private mode	6
129. Support 'name' attribute on <details> ("Accordion pattern using name attribute on <details> elements")	6
130. Add Web Neural Network (WebNN)	6
131. Geofencing API	6
132. Add support for iterator helpers	6
133. Add tracking for Explicit Resource Management (`using` and `await using`)	6
134. Add CSS Values and Units Module Level 4 Mathematical Expressions	6
135. add window-inactive pseudo-class	5
136. Add Intl.DurationFormat	5
137. Add the HTML focusgroup attribute	5
138. Add raw sockets API	5
139. Popover API	5
140. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	5
141. Add the `<model>` element	5
142. webp2 support	5
143. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	5
144. Add supports() queries on @import	5
145. Add HTTP method: QUERY	5
146. Adding Khronos gITF 2.0 for 3D models	5
147. CSS Round Display	5
148. CSS Shaders -	5
149. roundRect	5
150. Add support tables for document.documentElement.clientWidth	5
151. Global Privacy Control (GPC) "Sec-GPC" HTTP header	5
152. Input type=email with "multiple" attribute	5
153. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
154. Add font-palette-values	5
155. Tracking various WebAuthn features	5
156. Bundled HTTP Exchanges	5
157. WebP & AVIF favicons	5
158. Please track the various HTTP Set-Cookie options supported by browsers	5
159. Add Incremental Font Transfer	5
160. audio / video autoplay attribute and play function	5
161. Input Events Level 1 and 2	5
162. Feature: A Well-Known URL for Changing Passwords	5
163. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
164. Payment Handler API	5
165. Support individual CSP rules	5
166. Add "page based counters"	5
167. HTTP Strict Transport Security Preload	5
168. JS Self-Profiling API	5
169. Add tracking for "Ultra HDR JPG"	5
170. Add meta "format-detection"	4
171. Screen Capture	4
172. Graphite font support	4
173. Web locks	4
174. Add gRPC support	4
175. Support for Digital Goods API	4
176. SameParty cookie attribute	4
177. Add Intl.DisplayNames	4
178. Accessibility of in-browser PDF Viewer	4
179. Support information for horizontal-viewport-segments and vertical-viewport-segments	4
180. Add Local Font Access API	4
181. Support aria-hidden html property	4
182. Add IPFS (Interplanetary File System) protocol to Caniuse	4
183. Add Cookie Store API	4
184. webkit-calendar-picker-indicator	4
185. File Handling API	4
186. ::-webkit-file-upload-button	4
187. documentMode	4
188. Cache-Control	4
189. SVG sprites with <symbol> and <use>	4
190. The !important css thing. It's very !important ;).	4
191. Support the W3 Web Annotation standard (W3C Recommendation)	4
192. CSS image() functional notation (e.g. for background-images etc). See	4
193. Support for Geometry Property (SVG 2.0) `r` in CSS	4
194. Arithmetic coded JPEG support	4
195. New top level domains (TLD)	4
196. filename*=UTF-8''...	4
197. [CSS Level 4 pseudo-class] :user-error	4
198. Support SVG width/height = auto	4
199. Add support for passwordrules input attribute	4
200. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
201. Add Invokers, currently `invoketarget` & `invokeaction`	4
202. Snap Events: scrollsnapchange and scrollsnapchanging	4
203. Add Media Session API Coverage Information	4
204. Private Click Measurement (PCM)	3
205. CSS view-timeline supports	3
206. Add "CICP in images"	3
207. Support new global attribute: writingsuggestions	3
208. Add support for HTTP header X-Permitted-Cross-Domain-Policies	3
209. Add information for the webcal and webcals protocols for subscribing to iCalendars	3
210. Public class properties	3
211. Add support for addHitRegion	3
212. CSS multicol data is mixed with fragmentation	3
213. Content-Security-Policy: script-nonce	3
214. Missing feature: Clipboard API supported mimetypes	3
215. Add `dynamic-range` media query	3
216. New browser feature: rest/spread in object literals	3
217. Add 'animated GIF as favicon'?	3
218. justify-content: space-around	3
219. Add "Responsive Video" aka. `media` attribute for `<source>` element in `<video>`	3
220. Show ANSI escape code for console.log.	3
221. Add support for requestSubmit	3
222. ECMAscript - static properties	3
223. Add server-timing as a trailer	3
224. No information about the `unselectable` HTML attribute.	3
225. IPv6 support in web browsers	3
226. Can I Use m4a?	3
227. Support for CSS3 background-repeat-x and background-repeat-y properties	3
228. add iframe.csp	3
229. Add "Window Controls Overlay"	3
230. place-items shorthand for justify and align	3
231. getEventListeners not listed	3
232. video codecs	3
233. Add Wide Color Gamut in 2D Canvas	3
234. Web bundles	3
235. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	3
236. X25519Kyber768 Hybrid Post-Quantum Key Exchange for HTTPS	3
237. Video media in image contexts	3
238. display: table-caption?	3
239. Add CMYK Color Space	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. Basic Authentication: AuthName directive	2
244. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
245. CSS word-break: 'auto-phrase' and 'manual'	2
246. Add browser support for toggle()	2
247. Add the Javascript double asterisk power operator (**) to the list of supported features	2
248. Can I use X3D?	2
249. onerror event on iframe	2
250. Add CSS4 Grid structural selectors	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. Please add more detailed WebRTC features	2
258. add RTSP and RTSP 2.0 (Real Time Streaming Protocol)	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. Add Date.prototype.toTemporalInstant()	2
266. Request: nav-up, nav-down, nav-left, nav-right css3 properties	2
267. add secure payment confirmation (W3C)	2
268. Input type=range with "multiple" attribute	2
269. Support of sms: and mms: in mobile browsers is not clear	2
270. Support for hrefTranslate	2
271. Metadata name: HandheldFriendly	2
272. Track adoption of DOMFrameContentLoaded event	2
273. Track the status of the JavaScript Promise Integration specification	2
274. `from-image` as initial value of `image-orientation`	2
275. Show which browsers have a native CSV viewer	2
276. support destructuring assignment as separate es feature	2
277. Touch Icons (apple-touch-icon)	2
278. stroke-linejoin support	2
279. Add chrome.webrequests	2
280. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	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. Add Geolocation Sensor	2
285. <semantics> element in MathML is not found in caniuse.com	2
286. Spatial Navigation support	2
287. HTTP immutable responses	2
288. text-space-collapse	2
289. Add app-region?	2
290. CSS touch-action level 2 values	2
291. Tooltip display on focus	2
292. Support KV Storage build-in module	2
293. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
294. DNS-over-HTTPS (DoH)	2
295. SSML	2
296. String.prototype.split() with a regex with grouping ( parentheses ).	2
297. Storage Access API	2
298. Support Experimental "ES Pipe Operator (|>)"	2
299. console.assert(boolean_expression)	2
300. srcset/sizes attribute / picture element support in SVG	2
301. EventTarget Constructor	2
302. Add auto-expand `<details>` for find-in-page and fragment navigations	2
303. Device-Memory Client Hint & navigator.deviceMemory JS API	2
304. viewport meta tag	2
305. setTimeout and setInterval callback parameters	2
306. dns.resolve	2
307. Add HTTP_ORIGIN feature	2
308. Add block-step-size property for CSS	2
309. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	2
310. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
311. A new page for Grid track animation should be added	2
312. Add "Scheduled Task API"	2
313. SharedMemory/Atomics	2
314. getFilesAndDirectories	2
315. add captureVisibleTab	2
316. Loading Signed Exchanges	2
317. SVG image auto height	2
318. Add PNG cursor	2
319. SVG symbols in CSS	2
320. add csp lv2 violation event	2
321. add "unicode property escapes"	2
322. Add Change Array by Copy methods	1
323. CAA DNS record	1
324. Add CSS `@property`	1
325. Add URL.canParse()	1
326. Add WebDriver BiDi	1
327. Add `PWA file handlers`	1
328. Please add support data for "CSS property: clip-path: inset()". Thank you!	1
329. Add Gradient Interpolation Color Spaces	1
330. MPNG	1
331. Add Web Translation API …maybe eventually	1
332. SVG 2: inline-size property for text	1
333. Add Web Preferences API …maybe eventually	1
334. Web monetization	1
335. Add selection.getComposedRange() feature check	1
336. CSS property media-controls-panel	1
337. Feature request: tc39 Explicit Resource Management	1
338. Suggestion: @font-face src OpenType collection support	1
339. WebSerial	1
340. Support for CSS Color Module Level 5	1
341. Add IndexedDB 3.0	1
342. Playback of videos with alpha channel	1
343. Add "method of opting into following the visual order", currently `focus-order` …maybe eventually	1
344. Add Web MIDI 2.0 …maybe eventually	1
345. sec-ch-prefers headers	1
346. Sec-Ch-wow64	1
347. Opus: Need data for MP4 and WebM containers	1
348. Add Background Blur API	1
349. Audio format: AC-3, eac3	1
350. 'font-size' descriptor for '@font-face'	1
351. Add CSS Scroll Snap Module Level 2	1
352. X.509 Name Constraints	1
353. Add "Scoped Custom Element Registry" as it is now behind an experimental feature flag in Chrome	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. Add `@font-feature-values`	1
363. Add tech() function support (in @font-face src)	1
364. TLS Encrypted Client Hello (ECH)	1
365. Add Payment Request API 1.1	1
366. Add `new Intl.DateTimeFormat().resolvedOptions().hour12`	1
367. Add tracking for ASTC hdr profile	1
368. Add `blocking=render`	1
369. Add variable units	1
370. import reflection for WASM	1
371. Support HTJ2K	1
372. View Transitions Module Level 2	1
373. viewport-fit	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. 32-bit HDR PNG	1
379. Add optional type syntax for JavaScript …maybe eventually	1
380. Add `Notification.prototype​.showTrigger️`	1
381. Browser support for Running elements	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