Suggestion	Votes
1. HTTP content-encoding: zstd	31
2. Add lab() and lch() from CSS Color Module Level 4	28
3. Add support table for CSP 3.0 compliance	28
4. Suggestion: MediaRecorder.isTypeSupported supported types/codecs	28
5. Add HTTP 103 Early Hints	25
6. css/svg property dominant-baseline	24
7. window.onerror - / - particularly mobile browser support	24
8. Can I use Reporting API	23
9. Add WebDriver	22
10. text-wrap	21
11. Add ES7/2016 SIMD	21
12. Add CSS Color Module Level 5 (color-adjust(), color-mix(), color-contrast())	21
13. Entries for href values including `tel:1234567` and `sms:1234567`	21
14. Hyphenation Options	20
15. JavaScript: Tail Call Support information missing	19
16. Track support for newly added spec: Dimensions (width/height) in <source> tags	18
17. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	18
18. Priority hints API	18
19. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	18
20. New feature: CSS Typed Object Model (CSS Typed OM)	17
21. XSLT Support table	17
22. TLS ECH (Encrypted Client Hello), formerly known as ESNI (Encrypted Server Name Indication)	17
23. device-cmyk css feature	16
24. Support constructible stylesheets / adoptedStyleSheets	16
25. WebExtensions (browser extensions)	16
26. + WASM SIMD	15
27. Support Intrinsic Size Attribute	15
28. Add CSS Grid Layout Module Level 3 (Masonry!)	15
29. Page Lifecycle API	15
30. border-corner-shape	15
31. Add Media Queries Ranges	14
32. `content: leader('.');`	14
33. Add beforeinput event	13
34. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	13
35. Geo URI scheme	13
36. I suggest support for TransferableObject types (of which there are several)	12
37. Color Fonts including SVG-in-OT fonts	12
38. WebTransport	12
39. text-security missing in list of features	12
40. SVGZ-specific support table since iOS < 4.2 doesn't support it, but does support SVG. Not su...	12
41. webcl?	11
42. Soft hyphen: html entity &shy;	11
43. Async iterators / for await of	11
44. Add Report-To API (Intervention Reports)	10
45. CSS Box Alignment Module Level 3	10
46. New feature request: OCSP must-staple	10
47. queueMicrotask support	10
48. @font-face descriptors to override font metrics	10
49. Please add iFrame element contentWindow property	9
50. Quota Management API	9
51. CSS3 Speech Module Which browsers support it? See	9
52. Add float: footnote to CSS3	9
53. List support for the window.fetch keepalive option	9
54. Add WebRTC insertable streams	9
55. Support for SVG's "shape-rendering" CSS property.	9
56. Add Web Share Target API	9
57. Cookies: max-age	9
58. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	9
59. Add caniuse data for Contact Picker API	9
60. Include `baseline-shift` CSS property	9
61. ElementInternals/form-associated custom element	9
62. Support CSS two-value display syntax	8
63. SVG viewport-fill property support	8
64. SVG viewport-fill-opacity property support	8
65. HTTP2 Server Push	8
66. Add CSS animation timing function spring()	8
67. Add supported elliptical curves (HTTPS/TLS)	8
68. Show Support for JSON Modules	8
69. Badging API	8
70. webM alpha transparency	8
71. Add Webassembly Threads / Threaded Webassembly	8
72. Track Intl.Segmenter	8
73. caniuse : Constructable Stylesheet	8
74. Add Web Share Level 2	8
75. Add support for the __Host- and __Secure-	7
76. 'imagesizes' & 'imagesrcset' for <link rel="preload">	7
77. RFC7692 Compression Extensions for WebSocket	7
78. This regards adding support for the navigator.userAgentData	7
79. User-Agent Client Hints (UA-CH)	7
80. Secure Cookie flag	7
81. Feature: Origin-bound one-time codes delivered via SMS	7
82. WebGL extensions	7
83. Alt-Svc header browser support info: consider adding	7
84. autocorrect for input fileds	7
85. HTMLVideoElement.requestVideoFrameCallback()	7
86. one-time-code	7
87. Add SVG `use` with external reference	7
88. Please add "isInputPending()"	7
89. Support for the frame-ancestors directive	7
90. input[autocomplete] (values besides on/off)	7
91. Module Worker support	6
92. Add 'require-sri-for' CSP Directive	6
93. MediaStream Image Capture	6
94. Add `accent-color` property (CSS UI 4)	6
95. New feature request: x25519 Key Exchange	6
96. CSS 3 property: text-autospace and text-spacing	6
97. Flag storage that is not available under private mode	6
98. WebCrypto Key Discovery	6
99. Add `multipart/x-mixed-replace`	6
100. Cannot see |ImageCapture| entry in the web interface.	6
101. Fetch Metadata Request Headers	6
102. Add scroll-padding	6
103. HTML Modules	6
104. Add Web Share Target API Level 2	6
105. CSS tag {content: url()}	6
106. Add `enterkeyhint` attribute ("Enter Key Hint")	6
107. Geofencing API	6
108. Bundled HTTP Exchanges	5
109. Add font-palette-values	5
110. HTTP Strict Transport Security Preload	5
111. Add `text-underline-offset` property	5
112. Embedded color profiles in JPEG images.	5
113. Observable	5
114. audio / video autoplay attribute and play function	5
115. Please track the various HTTP Set-Cookie options supported by browsers	5
116. Add Declarative Shadow DOM	5
117. Add support tables for document.documentElement.clientWidth	5
118. Feature: A Well-Known URL for Changing Passwords	5
119. Support individual CSP rules	5
120. Track support for navigator.getInstalledRelatedApps()	5
121. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
122. Add isSecureContext feature to list	5
123. Tiff image format	5
124. Accelerated Shape Detection in Images	5
125. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
126. Adding Khronos gITF 2.0 for 3D models	5
127. -ms-overflow-style	5
128. Add autocorrect, autocapitalize, autocomplete attributes	5
129. Page-margin boxes (@top-center, etc)	5
130. Arithmetic coded JPEG support	4
131. Support the W3 Web Annotation standard (W3C Recommendation)	4
132. Web locks	4
133. Add Versatile Video Coding (VVC) … somewhen	4
134. Support aria-hidden html property	4
135. Add Eyedropper API to caniuse	4
136. Screen Capture	4
137. [WebCryptoAPI] randomUUID	4
138. Add support for Trust Tokens API	4
139. Support for Digital Goods API	4
140. New top level domains (TLD)	4
141. new CSS trigonometry functions	4
142. Payment Handler API	4
143. Add Cookie Store API	4
144. Add raw sockets API	4
145. Input Events Level 1 and 2	4
146. Add previousSibling and previousElementSibling	4
147. Audio codec - xHE-AAC / USAC	4
148. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	4
149. Add `WebOTP` to list of apis	4
150. ::-webkit-file-upload-button	4
151. USDZ file format	4
152. CSS Round Display	4
153. [CSS Level 4 pseudo-class] :user-error	4
154. CSS image() functional notation (e.g. for background-images etc). See	4
155. Cache-Control	4
156. allowtransparency	4
157. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	4
158. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
159. CSS Shaders -	4
160. Add data for link rel="alternate"	3
161. Support for MHTML	3
162. <virtual-scroller>	3
163. place-items shorthand for justify and align	3
164. Add meta "format-detection"	3
165. Add Intl.DisplayNames	3
166. Network Service Discovery	3
167. display: table-caption?	3
168. Private Click Measurement (PCM)	3
169. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	3
170. Add Media Session API Coverage Information	3
171. Grid-auto-flow	3
172. CSS multicol data is mixed with fragmentation	3
173. Public class properties	3
174. Add <data> element	3
175. Adding Silverlight usage stats	3
176. add window-inactive pseudo-class	3
177. Keyboard Lock	3
178. The !important css thing. It's very !important ;).	3
179. http://www.w3.org/TR/web-alarms/	3
180. Add `dynamic-range` media query	3
181. ActiveX	3
182. SVG sprites with <symbol> and <use>	3
183. Add support for requestSubmit	3
184. Add ECC certificates	3
185. Support SVG width/height = auto	3
186. documentMode	3
187. Add support for addHitRegion	3
188. New browser feature: rest/spread in object literals	3
189. getTotalLength()	3
190. ECMAscript - static properties	3
191. Support KV Storage build-in module	2
192. Support of sms: and mms: in mobile browsers is not clear	2
193. filename*=UTF-8''...	2
194. JS Self-Profiling API	2
195. support destructuring assignment as separate es feature	2
196. SSML	2
197. Add PNG cursor	2
198. Can I use X3D?	2
199. Input type=email with "multiple" attribute	2
200. add csp lv2 violation event	2
201. Loading Signed Exchanges	2
202. Basic Authentication: AuthName directive	2
203. Why not suggests 'setPrototypeOf '	2
204. Storage Access API	2
205. add iframe.csp	2
206. SVG image auto height	2
207. dns.resolve	2
208. for ... of support data	2
209. add captureVisibleTab	2
210. Support for Canvas isPointInPath()	2
211. Add System Colors item	2
212. Add other values of `user-select` property	2
213. justify-content: space-around	2
214. x-webkit-speech	2
215. UTF-8 Dingbats	2
216. add "unicode property escapes"	2
217. Add information on context-stroke and context-fill	2
218. <input type=file>: ability to modify the selected files via JS	2
219. Touch Icons (apple-touch-icon)	2
220. EventTarget Constructor	2
221. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
222. Add information about CSS pseudo selector :defined	2
223. Add Integrated Windows Authentication	2
224. Add Geolocation Sensor	2
225. getEventListeners not listed	2
226. Spatial Navigation support	2
227. Add Sanitizer API	2
228. Please add ES3 support	2
229. Track adoption of DOMFrameContentLoaded event	2
230. add Accessibility Object Model	2
231. Add HTMLInputElement.select()	2
232. <semantics> element in MathML is not found in caniuse.com	2
233. Add 'animated GIF as favicon'?	2
234. track support for the media query feature -ms-high-contrast	2
235. CanIUse OpenSearch	2
236. Show ANSI escape code for console.log.	2
237. onerror event on iframe	2
238. .getPointAtLength()	2
239. Add transitionstart event	2
240. Bitmap images inside SVG files. Some browsers that support SVG, will not show embedded bitmap image...	2
241. Add browser support for toggle()	2
242. setTimeout and setInterval callback parameters	2
243. Device-Memory Client Hint & navigator.deviceMemory JS API	2
244. HTTP immutable responses	2
245. Support for CSS3 background-repeat-x and background-repeat-y properties	2
246. String.prototype.split() with a regex with grouping ( parentheses ).	2
247. srcset/sizes attribute / picture element support in SVG	2
248. CSS touch-action level 2 values	2
249. Add new SVG filter effects	2
250. InputDeviceCapabilities API	2
251. Content-Security-Policy: script-nonce	2
252. External import maps	2
253. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
254. Add `q` (quarter-millimeters) length unit	2
255. Web bundles	2
256. SharedMemory/Atomics	2
257. Add CSS @when/@else	2
258. Content-Security-Policy: block-all-mixed-content	2
259. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
260. MediaDevices.selectAudioOutput	2
261. What about showing support for various link attributes, like "subresource" or "dns-pr...	2
262. Add information for the webcal and webcals protocols for subscribing to iCalendars	2
263. Graphite font support	2
264. [DOM API] `signal` option on EventTarget.protoype.addEventListener	2
265. SVG Foreign Object is a way to combine different XML namespaces elements into the SVG.	2
266. WebXR Hand Input Module - Level 1	2
267. CSS page property (for printing)	2
268. getFilesAndDirectories	2
269. HTTP Trailers	2
270. console.assert(boolean_expression)	2
271. line-height support and the differences in rendering between webkit&trident and other engines.	1
272. Suggestion for caniuse.com: Which browsers.versions support multiple tbody elements in a single table?	1
273. Add desynchronized (low latency canvas contexts)	1
274. Please add more detailed WebRTC features	1
275. add RTSP and RTSP 2.0 (Real Time Streaming Protocol)	1
276. @top-left @bottom-center ? can you test for compatibility	1
277. stroke-linecap support	1
278. stroke-linejoin support	1
279. HTMLInputElement API: select support	1
280. Window Placement API	1
281. MediaTrackConstraints	1
282. Can you please add the Stack trace API that exists in V8	1
283. Add Support for MPEG-4 Part 2 SP/ASP	1
284. Add CSS property `caret-shape` and shorthand `caret`	1
285. grid-row-gap and grid-column-gap	1
286. Show which browsers have a native CSV viewer	1
287. auto Picture-in-Picture	1
288. "GeometryUtils" - part of the CSSOM. Provides much better position information than existi...	1
289. voice-* properties aren't listed	1
290. nested calc() and var()	1
291. Request: nav-up, nav-down, nav-left, nav-right css3 properties	1
292. Web intents/Web Activities	1
293. Add Text.wholeText property	1
294. Support for hrefTranslate	1
295. Add ShadowRealm API	1
296. create @Media Types	1
297. feature request: video/MP2T	1
298. roundRect	1
299. Add Container Units aka. Container Relative Lengths	1
300. Metadata name: MobileOptimized	1
301. Can I Use m4a?	1
302. Request: IPv6 proxy functions (myIpAddressEx and friends)	1
303. Input type=range with "multiple" attribute	1
304. Metadata name: HandheldFriendly	1
305. No information about the `unselectable` HTML attribute.	1
306. Clean up css-touch-action	1
307. Document Policies	1
308. Can I use windowtext.	1
309. script tag onerror attribute	1
310. Add support information for font metric override descriptors	1
311. Add the Javascript double asterisk power operator (**) to the list of supported features	1
312. Add CSS Properties and Values API	1
313. Add URL Protocol Handler Registration for PWAs	1
314. Add: "color" and "background-color" CSS on <option> elements	1
315. Add `::-webkit-details-marker`	1
316. MediaStream Recording (	1
317. CMAF	1
318. css animation on “content:” - works on chrome, doesn't work on Safari and Firefox	1
319. Adding contain-intrinsic-size (suggestion)	1
320. accesskey attribute on non-focusable elements (should cause a click element to fire	1
321. Tracking various WebAuthn features	1
322. Add support for svg fill-rule	1
323. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	1
324. FLoC support	1
325. webkit-calendar-picker-indicator	1
326. <meta name="apple-mobile-web-app-capable" content="yes" />	1
327. Support for XPath 2.0 (interesting for a lot of new functions, like base-uri(), matches() etc.)	1
328. Streams API: transferable streams	1
329. bidi algorithm (for right-to-left Unicode characters)	1
330. iframe disallowdocumentaccess property	1
331. performance.measureMemory()	1
332. `from-image` as initial value of `image-orientation`	1
333. column-break-after atm only via: -webkit-column-break-after	1
334. SameParty cookie attribute	1
335. x-webkit-airplay	1
336. Add Compression Stream API	1
337. Textarea wrap attribute (off, soft, hard, virtual, physical)	1
338. Add entry for DTLS 1.3	1
339. Intl.NumberFormat - notation (scientific, engineering, etc)	1
340. rel="ar" support	1
341. missing HTTP TRACE method	1
342. Add "specifying a color profile: the `@color-profile` at-rule"	1
343. Add `media` attribute for `<meta>` element (for `<meta name="theme-color">`)	1
344. Add CSS module script/CSS modules	1
345. E4X: ECMAScript for XML	1
346. The hanging-punctuation property: Currently unsupported by any browser, but it would be nice to ...	1
347. image-resolution. I've seen this as a good alternative for retina images as opposed to backgro...	1
348. device-pixel-content-box for ResizeObserver	1
349. Add layout-instability support	1
350. I suggest adding information about support for alternate HTTP methods such as PUT and PATCH.	1
351. Browser support for RTP streams?	1
352. requestPostAnimationFrame browser support?	1
353. Missing feature: Clipboard API supported mimetypes	1
354. Information about WavPack audio format	1
355. InsertKey Behaviour Overwrite/Normal Mode	1
356. What is the browser support for the newly proposed "page-orientation" property?	1
357. Add WebKit Tap Highlight Color (-webkit-tap-highlight-color)?	1
358. Support for calc() in polygon and other shapes	1
359. Audio Output Devices API: wd	1
360. Add app-region?	1
361. URLSearchParams.prototype.sort	1
362. SVG symbols in CSS	1
363. Add HTTP_ORIGIN feature	1
364. document type	1
365. Add support for mediacapture-output API's sinkID	1
366. Add Range.getBoundingClientRect browser support table	1
367. Support XMLDocument	1
368. audio / video .canPlayType(MIMEtype)	1
369. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	1
370. DeviceOrientation and DeviceMotion events on insecure origins	1
371. Add "Controlling Font Display Per Font-Family via @font-feature-values"	1
372. Video media in image contexts	1
373. Please add support for supported x509 extensions for ʜᴛᴛᴘꜱ certificates	1
374. attachEvent event handler missing from CanIUse	1
375. Drag and Drop API - ghost image with customizable opacity	1
376. Drag and Drop API - move constraints	1
377. Add support for document.queryCommandState	1
378. Animating SVG paths using CSS	1
379. Support info for the <track> element	1
380. Chained selectors	1
381. Javascript pseudoprotocol	1
382. Add a footnote regarding HTMLAudioElement	1
383. aria-label	1
384. window.event	1
385. JS add oncuechange	1
386. [HTTP Header] Accept-CH-Lifetime	1
387. add CSS Extensions meant for renaming	1
388. Browser support for displaying the unicode block "Combining Diacritical Marks for Symbols"	1
389. Add box-suppress	1
390. CanvasRenderingContext2D.ellipse()	1
391. Support for Unicode and spaces in URL	1
392. Missing `StorageQuota` support	1
393. event.path	1
394. SHA2 certificates	1
395. Missing a check for msConvertURL() on DragEvent	1
396. Support for nested calc expressions in CSS values	1
397. Add "Named function expressions"	1
398. Open search autodiscovery	1
399. add mouse event positions event.offsetX and event.offsetY	1
400. reflected-xss missing	1
401. column combination	1
402. Internationalized Domain Name	1
403. Add XSL to caniuse	1
404. Add support for CSS3 move-to property	1
405. CaretPosition missing	1
406. add "document.contentType"	1
407. add aria-required to caniuse, if not already there	1
408. string-set	1
409. aria-labelledby	1
410. SHA1 certificates	1
411. Add support for HTTP header X-Permitted-Cross-Domain-Policies	1
412. Add support for the HTTP header X-Download-Options	1
413. add micropub	1
414. support data suggestion: DOM event constructors ?	1
415. [Suggestion] display: fullscreen	1
416. min/max-device-width/height	1
417. Add High Resolution Time Level 3	1
418. Add: Task Scheduler API Specification	1
419. Add css-timing	1
420. Suggestion: Int64 UInt64 (Firefox only AFAIK)	1
421. aria-current	1
422. request support for 'accept-charset'	1
423. add for...of loops	1
424. Please add JavaScript string functions trimStart, trimEnd, trimRight, trimLeft	1
425. DownloadURL	1
426. Support for RegExp Named Capture Groups	1
427. Suggested addition: navigator.cpuClass	1
428. online/offline can also be used as events and are not covered by caniuse.com (only boolean property is covered)	1
429. Report Retry-After header support	1
430. Keyboard Map API	1
431. date.toLocaleString support tracking plz?	1
432. Add windows-theme media query selector	1
433. https mixed mode	1
434. Add page for relative path in HTTP Location	1
435. background-composite	1
436. OfflineAudioContext	1
437. add onstorage	1
438. Feature request: Token Binding Protocol	1
439. IETF RFCs	1
440. VTTRegion is not found in caniuse	1
441. Use of es6 import statements in workers	1
442. CSS3 new text-transform keywords	1
443. step property of input field with type datetime-local and time	1
444. please add the onsearch event	1
445. Add support for CSS clip property	1
446. supported-color-schemes & prefers-color-scheme	1
447. <object>.contentWindow Support	1
448. Support Data Suggestion: Clients API	1
449. CSS Inline Layout	1
450. Refresh	1
451. How to show support for font-variation-settings within @font-face?	1
452. The event handler window.onscroll is missing	1
453. longdesc attribute support	1
454. baseline-middle	1
455. Support for Service Worker Life Cycle Events	1
456. Add checking for DataTransfer	1
457. Support data for Unicode flag on HTML pattern attribute	1
458. Edge and IE don't support IndexedDB in web workers	1
459. HTTP Content-encoding: LZFSE	1
460. IPv6 support in web browsers	1
461. add ime-mode	1
462. Add CSS4 Grid structural selectors	1
463. Suggestion: support for margin-collapse?	1
464. Add `onpagehide` support data	1
465. Add: Tracking Preference Expression APIs	1
466. Add KeyboardEvent.repeat compatibility info	1
467. Missing computed property names	1
468. browserconfig.xml support info	1
469. [HTTP Header] Cross-Origin-Opener-Policy	1
470. Node.contains	1
471. Character-based alignment in a table column using text-align	1
472. Add support information for SVG's getIntersectionList	1
473. Please list support for event.eventPhase	1
474. Please add support for getTimezoneOffset()	1
475. user-modify	1
476. [Feature Policy: sub-feature] Sandbox features	1
477. Add Object.prototype.watch method	1
478. support for HTMLTableElement.createTBody	1
479. window.watchMedia()	1
480. show support for namespacing; for example <svg: namespace	1
481. Add compatibility for FormData	1
482. The xml:space attribute	1
483. Add H2 ORIGIN frame support	1
484. Cannot find cancelBubble	1
485. ie behavior	1
486. window.localMediaStream is not listed	1
487. Add a matrix entyre for opentype-with-cff2	1
488. Add Scoped Styles aka. CSS Scoping	1