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