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