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