Suggestion	Votes
1. HTTP content-encoding: zstd	49
2. Add HTTP 103 Early Hints	43
3. css/svg property dominant-baseline	37
4. Add CSS Color Module Level 5 (color-mix(), color-contrast(), Relative color)	36
5. Add support table for CSP 3.0 compliance	32
6. Suggestion: MediaRecorder.isTypeSupported supported types/codecs	29
7. Entries for href values including `tel:1234567` and `sms:1234567`	26
8. + WASM SIMD	25
9. Track support for newly added spec: Dimensions (width/height) in <source> tags	25
10. text-wrap	24
11. Hyphenation Options	24
12. Add WebDriver	24
13. Can I use Reporting API	24
14. Priority hints API	23
15. Add customizable select element, currently `<selectmenu>`	22
16. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	22
17. Add ES7/2016 SIMD	21
18. TLS ECH (Encrypted Client Hello), formerly known as ESNI (Encrypted Server Name Indication)	21
19. WebExtensions (browser extensions)	20
20. JavaScript: Tail Call Support information missing	20
21. Show Support for JSON Modules	20
22. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	19
23. New feature: CSS Typed Object Model (CSS Typed OM)	19
24. XSLT Support table	19
25. Support constructible stylesheets / adoptedStyleSheets	18
26. Add CSS Grid Layout Module Level 3 (Masonry!)	17
27. device-cmyk css feature	17
28. Page Lifecycle API	16
29. border-corner-shape	16
30. Support Intrinsic Size Attribute	15
31. `content: leader('.');`	14
32. Async iterators / for await of	13
33. Geo URI scheme	13
34. ElementInternals/form-associated custom element	13
35. I suggest support for TransferableObject types (of which there are several)	13
36. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	13
37. input-security	13
38. Color Fonts including SVG-in-OT fonts	12
39. New feature request: OCSP must-staple	12
40. SVGZ-specific support table since iOS < 4.2 doesn't support it, but does support SVG. Not su...	12
41. Support for SVG's "shape-rendering" CSS property.	11
42. Add Webassembly Threads / Threaded Webassembly	11
43. webcl?	11
44. Soft hyphen: html entity &shy;	11
45. CSS3 Speech Module Which browsers support it? See	11
46. Add WebRTC insertable streams	11
47. Add float: footnote to CSS3	11
48. Track Intl.Segmenter	10
49. CSS Box Alignment Module Level 3	10
50. caniuse : Constructable Stylesheet	10
51. one-time-code	10
52. @font-face descriptors to override font metrics	10
53. Add Report-To API (Intervention Reports)	10
54. Add Web Share Level 2	10
55. queueMicrotask support	10
56. Add caniuse data for Contact Picker API	10
57. List support for the window.fetch keepalive option	9
58. Quota Management API	9
59. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	9
60. Add oklab() and oklch()	9
61. Cookies: max-age	9
62. Add CSS animation timing function spring()	9
63. Include `baseline-shift` CSS property	9
64. Add Web Share Target API	9
65. Support CSS two-value display syntax	9
66. webM alpha transparency	9
67. HTTP2 Server Push	9
68. WebGL extensions	8
69. HTMLVideoElement.requestVideoFrameCallback()	8
70. Badging API	8
71. SVG viewport-fill-opacity property support	8
72. SVG viewport-fill property support	8
73. Add supported elliptical curves (HTTPS/TLS)	8
74. Add CSS property `caret-shape` and shorthand `caret`	8
75. Add ShadowRealm API	8
76. Add SVG `use` with external reference	8
77. RFC7692 Compression Extensions for WebSocket	7
78. Secure Cookie flag	7
79. User-Agent Client Hints (UA-CH)	7
80. HTML Modules	7
81. Add `WebOTP` to list of apis	7
82. Alt-Svc header browser support info: consider adding	7
83. autocorrect for input fileds	7
84. Support for the frame-ancestors directive	7
85. Please add "isInputPending()"	7
86. Tiff image format	7
87. Feature: Origin-bound one-time codes delivered via SMS	7
88. input[autocomplete] (values besides on/off)	7
89. Page-margin boxes (@top-center, etc)	7
90. This regards adding support for the navigator.userAgentData	7
91. New feature request: x25519 Key Exchange	6
92. Flag storage that is not available under private mode	6
93. WebCrypto Key Discovery	6
94. Add System Colors item	6
95. CSS tag {content: url()}	6
96. Accelerated Shape Detection in Images	6
97. Observable	6
98. Cannot see |ImageCapture| entry in the web interface.	6
99. CSS 3 property: text-autospace and text-spacing	6
100. Add 'require-sri-for' CSP Directive	6
101. Module Worker support	6
102. Add Web Share Target API Level 2	6
103. MediaStream Image Capture	6
104. Add `enterkeyhint` attribute ("Enter Key Hint")	6
105. Audio codec - xHE-AAC / USAC	6
106. Add support for Trust Tokens API	6
107. Add autocorrect, autocapitalize, autocomplete attributes	6
108. Add CSS Custom Highlight API	6
109. Add "outline follows border-radius"	6
110. Add `multipart/x-mixed-replace`	6
111. Geofencing API	6
112. Add CSS module script/CSS modules	6
113. Add CSS Values and Units Module Level 4 Mathematical Expressions	6
114. -ms-overflow-style	6
115. Support individual CSP rules	5
116. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	5
117. Please track the various HTTP Set-Cookie options supported by browsers	5
118. Add ECC certificates	5
119. Add support tables for document.documentElement.clientWidth	5
120. External import maps	5
121. roundRect	5
122. Add support for DNS RRs, like HTTPS and SVCB	5
123. USDZ file format	5
124. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
125. Embedded color profiles in JPEG images.	5
126. Add supports() queries on @import	5
127. Adding Khronos gITF 2.0 for 3D models	5
128. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	5
129. new CSS trigonometry functions	5
130. audio / video autoplay attribute and play function	5
131. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
132. HTTP Strict Transport Security Preload	5
133. Add Versatile Video Coding (VVC) … somewhen	5
134. Add font-palette-values	5
135. allowtransparency	5
136. Feature: A Well-Known URL for Changing Passwords	5
137. Bundled HTTP Exchanges	5
138. Add the Quite OK Image Format (QOI) …maybe eventually	5
139. Cache-Control	4
140. CSS image() functional notation (e.g. for background-images etc). See	4
141. Screen Capture	4
142. add Accessibility Object Model	4
143. Arithmetic coded JPEG support	4
144. Add the `<model>` element	4
145. Support aria-hidden html property	4
146. Global Privacy Control (GPC) "Sec-GPC" HTTP header	4
147. Add Intl.DisplayNames	4
148. The !important css thing. It's very !important ;).	4
149. Add the `:modal` pseudo-class	4
150. ::-webkit-file-upload-button	4
151. CSS Round Display	4
152. Support for MHTML	4
153. New top level domains (TLD)	4
154. Add raw sockets API	4
155. Payment Handler API	4
156. CanIUse OpenSearch	4
157. Support for Digital Goods API	4
158. [CSS Level 4 pseudo-class] :user-error	4
159. JS Self-Profiling API	4
160. Input type=email with "multiple" attribute	4
161. Add Cookie Store API	4
162. CSS Shaders -	4
163. Input Events Level 1 and 2	4
164. Support SVG width/height = auto	4
165. Window Placement API	4
166. Support the W3 Web Annotation standard (W3C Recommendation)	4
167. Tracking various WebAuthn features	4
168. SVG sprites with <symbol> and <use>	4
169. Web locks	4
170. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
171. CSS page property (for printing)	3
172. Add information for the webcal and webcals protocols for subscribing to iCalendars	3
173. Add the HTML focusgroup attribute	3
174. Add "page based counters"	3
175. Accessibility of in-browser PDF Viewer	3
176. Add meta "format-detection"	3
177. place-items shorthand for justify and align	3
178. New browser feature: rest/spread in object literals	3
179. justify-content: space-around	3
180. ECMAscript - static properties	3
181. Add Media Session API Coverage Information	3
182. Add `dynamic-range` media query	3
183. Add support for requestSubmit	3
184. Private Click Measurement (PCM)	3
185. CSS multicol data is mixed with fragmentation	3
186. add iframe.csp	3
187. Public class properties	3
188. Can I Use m4a?	3
189. Add Scoped Styles aka. CSS Scoping	3
190. getEventListeners not listed	3
191. add window-inactive pseudo-class	3
192. webp2 support	3
193. Web bundles	3
194. Add passkeys	3
195. Add support for addHitRegion	3
196. documentMode	3
197. getTotalLength()	3
198. Add <data> element	3
199. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	3
200. http://www.w3.org/TR/web-alarms/	3
201. display: table-caption?	3
202. Drag and Drop API - ghost image with customizable opacity	2
203. Add IPFS (Interplanetary File System) protocol to Caniuse	2
204. Support KV Storage build-in module	2
205. Add Date.prototype.toTemporalInstant()	2
206. SharedMemory/Atomics	2
207. Basic Authentication: AuthName directive	2
208. Storage Access API	2
209. Add TPG image file format	2
210. Touch Icons (apple-touch-icon)	2
211. Missing feature: Clipboard API supported mimetypes	2
212. Add CSS4 Grid structural selectors	2
213. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
214. What about showing support for various link attributes, like "subresource" or "dns-pr...	2
215. Request: nav-up, nav-down, nav-left, nav-right css3 properties	2
216. Content-Security-Policy: script-nonce	2
217. Add gRPC support	2
218. File Handling API	2
219. Add chrome.webrequests	2
220. Input type=range with "multiple" attribute	2
221. add "unicode property escapes"	2
222. Add "Window Controls Overlay"	2
223. Graphite font support	2
224. Add Wide Color Gamut in 2D Canvas	2
225. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
226. voice-* properties aren't listed	2
227. Add information on context-stroke and context-fill	2
228. UTF-8 Dingbats	2
229. Add Integrated Windows Authentication	2
230. Add Geolocation Sensor	2
231. <semantics> element in MathML is not found in caniuse.com	2
232. stroke-linejoin support	2
233. console.assert(boolean_expression)	2
234. HTTP Trailers	2
235. "GeometryUtils" - part of the CSSOM. Provides much better position information than existi...	2
236. Add 'animated GIF as favicon'?	2
237. Animating SVG paths using CSS	2
238. dns.resolve	2
239. Loading Signed Exchanges	2
240. Add the Javascript double asterisk power operator (**) to the list of supported features	2
241. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
242. onerror event on iframe	2
243. Can I use X3D?	2
244. rel="ar" support	2
245. SameParty cookie attribute	2
246. Show ANSI escape code for console.log.	2
247. Bitmap images inside SVG files. Some browsers that support SVG, will not show embedded bitmap image...	2
248. text-space-collapse	2
249. WebXR Hand Input Module - Level 1	2
250. Device-Memory Client Hint & navigator.deviceMemory JS API	2
251. webkit-calendar-picker-indicator	2
252. x-webkit-speech	2
253. MediaDevices.selectAudioOutput	2
254. `from-image` as initial value of `image-orientation`	2
255. HTTP immutable responses	2
256. SSML	2
257. support destructuring assignment as separate es feature	2
258. Add other values of `user-select` property	2
259. Add PNG cursor	2
260. add captureVisibleTab	2
261. Tooltip display on focus	2
262. add csp lv2 violation event	2
263. Add the Pop Up API aka. the `popup` attribute plus more	2
264. SVG image auto height	2
265. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	2
266. String.prototype.split() with a regex with grouping ( parentheses ).	2
267. A new page for Grid track animation should be added	2
268. srcset/sizes attribute / picture element support in SVG	2
269. EventTarget Constructor	2
270. Please add ES3 support	2
271. Add browser support for toggle()	2
272. Track adoption of DOMFrameContentLoaded event	2
273. Support of sms: and mms: in mobile browsers is not clear	2
274. Add Local Font Access API	2
275. Support for hrefTranslate	2
276. Spatial Navigation support	2
277. CSS touch-action level 2 values	2
278. getFilesAndDirectories	2
279. SVG symbols in CSS	2
280. track support for the media query feature -ms-high-contrast	2
281. setTimeout and setInterval callback parameters	2
282. filename*=UTF-8''...	2
283. Container Queries should be broken out into three pages	2
284. Support for CSS3 background-repeat-x and background-repeat-y properties	2
285. Add support information for font metric override descriptors	1
286. Can you please add the Stack trace API that exists in V8	1
287. Feature request: Token Binding Protocol	1
288. add onstorage	1
289. longdesc attribute support	1
290. create @Media Types	1
291. Show which browsers have a native CSV viewer	1
292. IETF RFCs	1
293. Add entry for DTLS 1.3	1
294. missing HTTP TRACE method	1
295. requestPostAnimationFrame browser support?	1
296. bidi algorithm (for right-to-left Unicode characters)	1
297. Add "specifying a color profile: the `@color-profile` at-rule"	1
298. FLoC support	1
299. Add `media` attribute for `<meta>` element (for `<meta name="theme-color">`)	1
300. CSS Inline Layout	1
301. Add `::-webkit-details-marker`	1
302. Add: "color" and "background-color" CSS on <option> elements	1
303. E4X: ECMAScript for XML	1
304. Add URL Protocol Handler Registration for PWAs	1
305. Video media in image contexts	1
306. MediaStream Recording (	1
307. stroke-linecap support	1
308. Add CSS Scroll Snap Module Level 2	1
309. Add CSS Toggles …maybe eventually	1
310. sec-ch-prefers headers	1
311. Sec-Ch-wow64	1
312. Support information for horizontal-viewport-segments and vertical-viewport-segments	1
313. I suggest adding information about support for alternate HTTP methods such as PUT and PATCH.	1
314. Add VisualViewport.segments support data	1
315. Add Capture Handle	1
316. Add "Scheduled Task API"	1
317. Add `font-variant-emoji`	1
318. Add `target="_new"`	1
319. Add "method of opting into following the visual order", currently `focus-order` …maybe eventually	1
320. Add `Notification.prototype​.showTrigger️`	1
321. Add Background Blur API	1
322. Add Web MIDI 2.0 …maybe eventually	1
323. line-height support and the differences in rendering between webkit&trident and other engines.	1
324. Add Fetch upload streaming	1
325. import reflection for WASM	1
326. Add `blocking=render`	1
327. Add IndexedDB 3.0	1
328. Add `WebSocketStream` API	1
329. Add Payment Request API 1.1	1
330. Add tech() function support (in @font-face src)	1
331. Browser support for RTP streams?	1
332. Add optional type syntax for JavaScript …maybe eventually	1
333. add RTSP and RTSP 2.0 (Real Time Streaming Protocol)	1
334. The hanging-punctuation property: Currently unsupported by any browser, but it would be nice to ...	1
335. Please add more detailed WebRTC features	1
336. nested calc() and var()	1
337. Suggestion for caniuse.com: Which browsers.versions support multiple tbody elements in a single table?	1
338. Can I use windowtext.	1
339. feature request: video/MP2T	1
340. script tag onerror attribute	1
341. image-resolution. I've seen this as a good alternative for retina images as opposed to backgro...	1
342. Add Container Units aka. Container Relative Lengths	1
343. Add MathML Core	1
344. Add compatibility data for QuickTime video format	1
345. Add Notification Triggers	1
346. TLS Encrypted Client Hello (ECH)	1
347. Add CMYK Color Space	1
348. Add Web Neural Network (WebNN)	1
349. accesskey attribute on non-focusable elements (should cause a click element to fire	1
350. <meta name="apple-mobile-web-app-capable" content="yes" />	1
351. Support for XPath 2.0 (interesting for a lot of new functions, like base-uri(), matches() etc.)	1
352. Add server-timing as a trailer	1
353. Web intents/Web Activities	1
354. Textarea wrap attribute (off, soft, hard, virtual, physical)	1
355. MPNG	1
356. Support HTJ2K	1
357. No information about the `unselectable` HTML attribute.	1
358. browserconfig.xml support info	1
359. device-pixel-content-box for ResizeObserver	1
360. Report Retry-After header support	1
361. window.watchMedia()	1
362. Missing `StorageQuota` support	1
363. Add compatibility for FormData	1
364. Add H2 ORIGIN frame support	1
365. Add support for CSS3 move-to property	1
366. Add XSL to caniuse	1
367. Add a matrix entyre for opentype-with-cff2	1
368. Support for Service Worker Life Cycle Events	1
369. Suggested addition: navigator.cpuClass	1
370. online/offline can also be used as events and are not covered by caniuse.com (only boolean property is covered)	1
371. date.toLocaleString support tracking plz?	1
372. aria-labelledby	1
373. reflected-xss missing	1
374. https mixed mode	1
375. Add page for relative path in HTTP Location	1
376. OfflineAudioContext	1
377. add mouse event positions event.offsetX and event.offsetY	1
378. Open search autodiscovery	1
379. Add "Named function expressions"	1
380. DownloadURL	1
381. event.path	1
382. Use of es6 import statements in workers	1
383. CSS3 new text-transform keywords	1
384. [Feature Policy: sub-feature] Sandbox features	1
385. Character-based alignment in a table column using text-align	1
386. please add the onsearch event	1
387. Add High Resolution Time Level 3	1
388. Please add support for supported x509 extensions for ʜᴛᴛᴘꜱ certificates	1
389. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	1
390. URLSearchParams.prototype.sort	1
391. Chained selectors	1
392. Javascript pseudoprotocol	1
393. Add app-region?	1
394. add aria-required to caniuse, if not already there	1
395. aria-current	1
396. Add css-timing	1
397. Add: Task Scheduler API Specification	1
398. Browser support for displaying the unicode block "Combining Diacritical Marks for Symbols"	1
399. SHA1 certificates	1
400. [Suggestion] display: fullscreen	1
401. Support for Unicode and spaces in URL	1
402. support data suggestion: DOM event constructors ?	1
403. Support data for Unicode flag on HTML pattern attribute	1
404. HTTP Content-encoding: LZFSE	1
405. IPv6 support in web browsers	1
406. add micropub	1
407. Suggestion: support for margin-collapse?	1
408. Add: Tracking Preference Expression APIs	1
409. Add support for the HTTP header X-Download-Options	1
410. Add support for HTTP header X-Permitted-Cross-Domain-Policies	1
411. step property of input field with type datetime-local and time	1
412. supported-color-schemes & prefers-color-scheme	1
413. background-composite	1
414. Adding contain-intrinsic-size (suggestion)	1
415. x-webkit-airplay	1
416. What is the browser support for the newly proposed "page-orientation" property?	1
417. Add layout-instability support	1
418. Information about WavPack audio format	1
419. InsertKey Behaviour Overwrite/Normal Mode	1
420. Add "Controlling Font Display Per Font-Family via @font-feature-values"	1
421. Please add support for getTimezoneOffset()	1
422. Add support for svg fill-rule	1
423. CMAF	1
424. css animation on “content:” - works on chrome, doesn't work on Safari and Firefox	1
425. Add Object.prototype.watch method	1
426. add CSS Extensions meant for renaming	1
427. show support for namespacing; for example <svg: namespace	1
428. The xml:space attribute	1
429. window.localMediaStream is not listed	1
430. Streams API: transferable streams	1
431. iframe disallowdocumentaccess property	1
432. performance.measureMemory()	1
433. Add windows-theme media query selector	1
434. Add WebKit Tap Highlight Color (-webkit-tap-highlight-color)?	1
435. auto Picture-in-Picture	1
436. Metadata name: HandheldFriendly	1
437. Metadata name: MobileOptimized	1
438. request support for 'accept-charset'	1
439. Add a footnote regarding HTMLAudioElement	1
440. <object>.contentWindow Support	1
441. Please add JavaScript string functions trimStart, trimEnd, trimRight, trimLeft	1
442. SHA2 certificates	1
443. column combination	1
444. Internationalized Domain Name	1
445. string-set	1
446. Refresh	1
447. How to show support for font-variation-settings within @font-face?	1
448. Add box-suppress	1
449. The event handler window.onscroll is missing	1
450. Add HTTP_ORIGIN feature	1
451. baseline-middle	1
452. Support for calc() in polygon and other shapes	1
453. Support info for the <track> element	1
454. document type	1
455. Add support for mediacapture-output API's sinkID	1
456. Add Range.getBoundingClientRect browser support table	1
457. Request: IPv6 proxy functions (myIpAddressEx and friends)	1
458. Clean up css-touch-action	1
459. DeviceOrientation and DeviceMotion events on insecure origins	1
460. Add desynchronized (low latency canvas contexts)	1
461. Audio Output Devices API: wd	1
462. @top-left @bottom-center ? can you test for compatibility	1
463. Drag and Drop API - move constraints	1
464. Add Support for MPEG-4 Part 2 SP/ASP	1
465. Missing computed property names	1