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