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