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