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