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