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