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