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