Suggestion	Votes
1. Add HTTP 103 Early Hints	53
2. css/svg property dominant-baseline	43
3. Suggestion: MediaRecorder.isTypeSupported supported types/codecs	37
4. + WASM SIMD	33
5. Entries for href values including `tel:1234567` and `sms:1234567`	31
6. TLS ECH (Encrypted Client Hello), formerly known as ESNI (Encrypted Server Name Indication)	29
7. Hyphenation Options	27
8. Can I use Reporting API	25
9. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	24
10. Add WebDriver	24
11. Show Support for JSON Modules	24
12. Priority hints API	23
13. JavaScript: Tail Call Support information missing	22
14. WebExtensions (browser extensions)	22
15. Add support for DNS RRs, like HTTPS and SVCB	22
16. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	21
17. Add ES7/2016 SIMD	21
18. XSLT Support table	21
19. New feature: CSS Typed Object Model (CSS Typed OM)	20
20. Add CSS property `caret-shape` and shorthand `caret`	20
21. border-corner-shape	19
22. Add CSS Grid Layout Module Level 3 (Masonry!)	19
23. device-cmyk css feature	19
24. External import maps	18
25. Support constructible stylesheets / adoptedStyleSheets	18
26. Page Lifecycle API	17
27. Add CSS `field-sizing` (previously `form-sizing`)	17
28. ElementInternals/form-associated custom element	15
29. Geo URI scheme	15
30. `content: leader('.');`	15
31. Support Intrinsic Size Attribute	15
32. Add Webassembly Threads / Threaded Webassembly	14
33. SVGZ-specific support table since iOS < 4.2 doesn't support it, but does support SVG. Not su...	14
34. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	14
35. Add ShadowRealm API	14
36. Async iterators / for await of	13
37. Native HTML Switches	13
38. I suggest support for TransferableObject types (of which there are several)	13
39. Add the Popover API (ex: Pop Up API aka. the `popup` attribute plus more)	13
40. input-security	13
41. Soft hyphen: html entity &shy;	12
42. New feature request: OCSP must-staple	12
43. Add Web Share Target API	12
44. Support for SVG's "shape-rendering" CSS property.	12
45. Color Fonts including SVG-in-OT fonts	12
46. Add caniuse data for Contact Picker API	11
47. Add the `<search>` element	11
48. Add the Quite OK Image Format (QOI) …maybe eventually	11
49. Add float: footnote to CSS3	11
50. CSS3 Speech Module Which browsers support it? See	11
51. Add "outline follows border-radius"	11
52. Page-margin boxes (@top-center, etc)	11
53. CSS Box Alignment Module Level 3	11
54. Add WebRTC insertable streams	11
55. webcl?	11
56. @font-face descriptors to override font metrics	10
57. webM alpha transparency	10
58. Track Intl.Segmenter	10
59. SVG viewport-fill property support	10
60. Add Web Share Level 2	10
61. queueMicrotask support	10
62. one-time-code	10
63. Include `baseline-shift` CSS property	10
64. Badging API	10
65. Add CSS Custom Highlight API	10
66. Add Report-To API (Intervention Reports)	10
67. Support CSS two-value display syntax	10
68. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	10
69. caniuse : Constructable Stylesheet	10
70. CSS 3 property: text-autospace and text-spacing	9
71. Add CSS animation timing function spring()	9
72. Add SVG `use` with external reference	9
73. HTTP2 Server Push	9
74. Add `WebOTP` to list of apis	9
75. Add supported elliptical curves (HTTPS/TLS)	9
76. Cookies: max-age	9
77. SVG viewport-fill-opacity property support	9
78. Quota Management API	9
79. List support for the window.fetch keepalive option	9
80. Add support for @starting-style rule	8
81. Tiff image format	8
82. Add text-wrap: pretty	8
83. input[autocomplete] (values besides on/off)	8
84. WebGL extensions	8
85. Add Versatile Video Coding (VVC) … somewhen	8
86. User-Agent Client Hints (UA-CH)	8
87. New feature request: x25519 Key Exchange	7
88. Alt-Svc header browser support info: consider adding	7
89. HTML Modules	7
90. -ms-overflow-style	7
91. Add support for Private State Tokens	7
92. RFC7692 Compression Extensions for WebSocket	7
93. This regards adding support for the navigator.userAgentData	7
94. Feature: Origin-bound one-time codes delivered via SMS	7
95. Audio codec - xHE-AAC / USAC	7
96. Add `multipart/x-mixed-replace`	7
97. Support for the frame-ancestors directive	7
98. Secure Cookie flag	7
99. Add `WebSocketStream` API	7
100. Please add "isInputPending()"	7
101. autocorrect for input fileds	7
102. Cannot see |ImageCapture| entry in the web interface.	6
103. CSS tag {content: url()}	6
104. Add ECC certificates	6
105. new CSS trigonometry functions	6
106. add Accessibility Object Model	6
107. Support for MHTML	6
108. Window Placement API	6
109. USDZ file format	6
110. MediaStream Image Capture	6
111. Add `enterkeyhint` attribute ("Enter Key Hint")	6
112. Accelerated Shape Detection in Images	6
113. Module Worker support	6
114. WebCrypto Key Discovery	6
115. Observable	6
116. Add System Colors item	6
117. Add Web Share Target API Level 2	6
118. Add "HDR AVIF" image support	6
119. Embedded color profiles in JPEG images.	6
120. Add autocorrect, autocapitalize, autocomplete attributes	6
121. Add CSS Values and Units Module Level 4 Mathematical Expressions	6
122. Geofencing API	6
123. Flag storage that is not available under private mode	6
124. Add the `:modal` pseudo-class	6
125. Add 'require-sri-for' CSP Directive	6
126. Feature: A Well-Known URL for Changing Passwords	5
127. Add raw sockets API	5
128. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
129. Add supports() queries on @import	5
130. Input type=email with "multiple" attribute	5
131. add window-inactive pseudo-class	5
132. CSS Round Display	5
133. roundRect	5
134. Add Intl.DurationFormat	5
135. Adding Khronos gITF 2.0 for 3D models	5
136. Add font-palette-values	5
137. Popover API	5
138. Tracking various WebAuthn features	5
139. Add the `<model>` element	5
140. HTTP Strict Transport Security Preload	5
141. Input Events Level 1 and 2	5
142. Bundled HTTP Exchanges	5
143. Global Privacy Control (GPC) "Sec-GPC" HTTP header	5
144. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	5
145. CSS Shaders -	5
146. Please track the various HTTP Set-Cookie options supported by browsers	5
147. Support individual CSP rules	5
148. audio / video autoplay attribute and play function	5
149. Support 'name' attribute on <details> ("Accordion pattern using name attribute on <details> elements")	5
150. webp2 support	5
151. Add support tables for document.documentElement.clientWidth	5
152. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	5
153. JS Self-Profiling API	5
154. CanIUse OpenSearch	5
155. Add: Webassembly Garbage Collection	5
156. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
157. Add Fetch upload streaming	4
158. webkit-calendar-picker-indicator	4
159. Add Media Session API Coverage Information	4
160. ::-webkit-file-upload-button	4
161. Support for Geometry Property (SVG 2.0) `r` in CSS	4
162. Cache-Control	4
163. filename*=UTF-8''...	4
164. Support aria-hidden html property	4
165. Add Intl.DisplayNames	4
166. Screen Capture	4
167. Support SVG width/height = auto	4
168. Add meta "format-detection"	4
169. Payment Handler API	4
170. Add tracking for "Ultra HDR JPG"	4
171. Web locks	4
172. The !important css thing. It's very !important ;).	4
173. CSS image() functional notation (e.g. for background-images etc). See	4
174. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
175. Arithmetic coded JPEG support	4
176. Add Cookie Store API	4
177. Support for Digital Goods API	4
178. New top level domains (TLD)	4
179. SVG sprites with <symbol> and <use>	4
180. Add Local Font Access API	4
181. Add "page based counters"	4
182. Support the W3 Web Annotation standard (W3C Recommendation)	4
183. Accessibility of in-browser PDF Viewer	4
184. Graphite font support	4
185. Add IPFS (Interplanetary File System) protocol to Caniuse	4
186. SameParty cookie attribute	4
187. [CSS Level 4 pseudo-class] :user-error	4
188. File Handling API	4
189. Add gRPC support	3
190. justify-content: space-around	3
191. Add the HTML focusgroup attribute	3
192. Add support for passwordrules input attribute	3
193. Add `dynamic-range` media query	3
194. Add support for addHitRegion	3
195. Add "Window Controls Overlay"	3
196. Content-Security-Policy: script-nonce	3
197. documentMode	3
198. Missing feature: Clipboard API supported mimetypes	3
199. Web bundles	3
200. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	3
201. Add tracking for Explicit Resource Management (`using` and `await using`)	3
202. Add "Responsive Video" aka. `media` attribute for `<source>` element in `<video>`	3
203. Show ANSI escape code for console.log.	3
204. ECMAscript - static properties	3
205. Add Invokers, currently `invoketarget` & `invokeaction`	3
206. WebP & AVIF favicons	3
207. Public class properties	3
208. Add 'animated GIF as favicon'?	3
209. Add support for requestSubmit	3
210. New browser feature: rest/spread in object literals	3
211. getEventListeners not listed	3
212. Can I Use m4a?	3
213. place-items shorthand for justify and align	3
214. Add Wide Color Gamut in 2D Canvas	3
215. Support for CSS3 background-repeat-x and background-repeat-y properties	3
216. add iframe.csp	3
217. video codecs	3
218. Support information for horizontal-viewport-segments and vertical-viewport-segments	3
219. CSS multicol data is mixed with fragmentation	3
220. display: table-caption?	3
221. CSS view-timeline supports	3
222. Private Click Measurement (PCM)	3
223. Add information for the webcal and webcals protocols for subscribing to iCalendars	3
224. support destructuring assignment as separate es feature	2
225. Add Web Neural Network (WebNN)	2
226. CSS word-break: 'auto-phrase' and 'manual'	2
227. Metadata name: MobileOptimized	2
228. Support for hrefTranslate	2
229. Add CMYK Color Space	2
230. stroke-linejoin support	2
231. Let's add a page for box alignment	2
232. Tooltip display on focus	2
233. Add Geolocation Sensor	2
234. Add support for iterator helpers	2
235. Add HTTP method: QUERY	2
236. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
237. dns.resolve	2
238. Add TPG image file format	2
239. Loading Signed Exchanges	2
240. Add "Scheduled Task API"	2
241. Support new global attribute: writingsuggestions	2
242. Add Date.prototype.toTemporalInstant()	2
243. `from-image` as initial value of `image-orientation`	2
244. <semantics> element in MathML is not found in caniuse.com	2
245. Add VisualViewport.segments support data	2
246. Add Container Units aka. Container Relative Lengths	2
247. track support for the media query feature -ms-high-contrast	2
248. Add block-step-size property for CSS	2
249. add secure payment confirmation (W3C)	2
250. Show which browsers have a native CSV viewer	2
251. Please add more detailed WebRTC features	2
252. rel="ar" support	2
253. Track adoption of DOMFrameContentLoaded event	2
254. Add chrome.webrequests	2
255. Metadata name: HandheldFriendly	2
256. Add the Javascript double asterisk power operator (**) to the list of supported features	2
257. Add Integrated Windows Authentication	2
258. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	2
259. DNS-over-HTTPS (DoH)	2
260. WebXR Hand Input Module - Level 1	2
261. Add server-timing as a trailer	2
262. Add auto-expand `<details>` for find-in-page and fragment navigations	2
263. add RTSP and RTSP 2.0 (Real Time Streaming Protocol)	2
264. Add information on context-stroke and context-fill	2
265. A new page for Grid track animation should be added	2
266. text-space-collapse	2
267. Storage Access API	2
268. SharedMemory/Atomics	2
269. setTimeout and setInterval callback parameters	2
270. UTF-8 Dingbats	2
271. Request: nav-up, nav-down, nav-left, nav-right css3 properties	2
272. Input type=range with "multiple" attribute	2
273. SSML	2
274. Add PNG cursor	2
275. add csp lv2 violation event	2
276. SVG image auto height	2
277. add captureVisibleTab	2
278. Support of sms: and mms: in mobile browsers is not clear	2
279. Drag and Drop API - ghost image with customizable opacity	2
280. Video media in image contexts	2
281. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	2
282. getFilesAndDirectories	2
283. SVG symbols in CSS	2
284. Device-Memory Client Hint & navigator.deviceMemory JS API	2
285. Spatial Navigation support	2
286. HTTP immutable responses	2
287. String.prototype.split() with a regex with grouping ( parentheses ).	2
288. x-webkit-speech	2
289. srcset/sizes attribute / picture element support in SVG	2
290. Add support for HTTP header X-Permitted-Cross-Domain-Policies	2
291. CSS touch-action level 2 values	2
292. Add CSS4 Grid structural selectors	2
293. Basic Authentication: AuthName directive	2
294. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
295. Can I use X3D?	2
296. onerror event on iframe	2
297. Animating SVG paths using CSS	2
298. HTTP Trailers	2
299. Add HTTP_ORIGIN feature	2
300. "GeometryUtils" - part of the CSSOM. Provides much better position information than existi...	2
301. console.assert(boolean_expression)	2
302. What about showing support for various link attributes, like "subresource" or "dns-pr...	2
303. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
304. Support KV Storage build-in module	2
305. Add browser support for toggle()	2
306. add "unicode property escapes"	2
307. Bitmap images inside SVG files. Some browsers that support SVG, will not show embedded bitmap image...	2
308. Touch Icons (apple-touch-icon)	2
309. EventTarget Constructor	2
310. Opus: Need data for MP4 and WebM containers	1
311. Add `target="_new"`	1
312. Add CSS Scroll Snap Module Level 2	1
313. Add "method of opting into following the visual order", currently `focus-order` …maybe eventually	1
314. Add Background Blur API	1
315. Add Object.prototype.watch method	1
316. 32-bit HDR PNG	1
317. Add `font-variant-emoji`	1
318. Add Web MIDI 2.0 …maybe eventually	1
319. show support for namespacing; for example <svg: namespace	1
320. The xml:space attribute	1
321. window.localMediaStream is not listed	1
322. Browser support for Running elements	1
323. viewport-fit	1
324. import reflection for WASM	1
325. Add `blocking=render`	1
326. Add IndexedDB 3.0	1
327. Please add TLS certificate algorithms to caniuse	1
328. Add Capture Handle	1
329. browserconfig.xml support info	1
330. Add `Notification.prototype​.showTrigger️`	1
331. Drag and Drop API - move constraints	1
332. MPNG	1
333. Add Web Translation API …maybe eventually	1
334. I suggest adding information about support for alternate HTTP methods such as PUT and PATCH.	1
335. Support info for the <track> element	1
336. Support HTJ2K	1
337. TLS Encrypted Client Hello (ECH)	1
338. Add optional type syntax for JavaScript …maybe eventually	1
339. Add a footnote regarding HTMLAudioElement	1
340. mediacapture-region	1
341. Add "CICP in images"	1
342. Add CSS Toggles …maybe eventually	1
343. View Transitions Module Level 2	1
344. sec-ch-prefers headers	1
345. Sec-Ch-wow64	1
346. add CSS Extensions meant for renaming	1
347. request support for 'accept-charset'	1
348. prefers-reduced-transparency CSS Media Query	1
349. Add Payment Request API 1.1	1
350. Add windows-theme media query selector	1
351. Playback of videos with alpha channel	1
352. Add tech() function support (in @font-face src)	1
353. Suggestion for caniuse.com: Which browsers.versions support multiple tbody elements in a single table?	1
354. Content-Security-Policy: navigate-to	1
355. accesskey attribute on non-focusable elements (should cause a click element to fire	1
356. MediaStream Recording (	1
357. Add Gradient Interpolation Color Spaces	1
358. Add Change Array by Copy methods	1
359. Add WebDriver BiDi	1
360. create @Media Types	1
361. Add "Scoped Custom Element Registry" as it is now behind an experimental feature flag in Chrome	1
362. Support Experimental "ES Pipe Operator (|>)"	1
363. Support for XPath 2.0 (interesting for a lot of new functions, like base-uri(), matches() etc.)	1
364. Add URL.canParse()	1
365. The hanging-punctuation property: Currently unsupported by any browser, but it would be nice to ...	1
366. script tag onerror attribute	1
367. Add `new Intl.DateTimeFormat().resolvedOptions().hour12`	1
368. Add tracking for ASTC hdr profile	1
369. Add variable units	1
370. Add Memory64 browser feature	1
371. image-resolution. I've seen this as a good alternative for retina images as opposed to backgro...	1
372. Add `@font-feature-values`	1
373. <meta name="apple-mobile-web-app-capable" content="yes" />	1
374. longdesc attribute support	1
375. Add WebKit Tap Highlight Color (-webkit-tap-highlight-color)?	1
376. SVG 2: inline-size property for text	1
377. background-composite	1
378. Add `PWA file handlers`	1
379. add onstorage	1
380. Web monetization	1
381. Suggestion: @font-face src OpenType collection support	1
382. Textarea wrap attribute (off, soft, hard, virtual, physical)	1
383. CAA DNS record	1
384. Add selection.getComposedRange() feature check	1
385. X.509 Name Constraints	1
386. Please add support data for "CSS property: clip-path: inset()". Thank you!	1
387. Audio format: AC-3, eac3	1
388. 'font-size' descriptor for '@font-face'	1
389. Feature request: Token Binding Protocol	1
390. viewport meta tag	1
391. Support of webkitAudioDecodedByteCount	1
392. CSS generated images: Stripes	1
393. IETF RFCs	1
394. CSS Inline Layout	1
395. Adding Managed Media Source	1
396. WebSerial	1
397. <object>.contentWindow Support	1
398. Audio Output Devices API: wd	1
399. IPv6 support in web browsers	1
400. Add compatibility for FormData	1
401. window.watchMedia()	1
402. [Feature Policy: sub-feature] Sandbox features	1
403. Character-based alignment in a table column using text-align	1
404. Missing computed property names	1
405. Add: Tracking Preference Expression APIs	1
406. Suggestion: support for margin-collapse?	1
407. x-webkit-airplay	1
408. What is the browser support for the newly proposed "page-orientation" property?	1
409. Add layout-instability support	1
410. Information about WavPack audio format	1
411. Add Support for MPEG-4 Part 2 SP/ASP	1
412. InsertKey Behaviour Overwrite/Normal Mode	1
413. HTTP Content-encoding: LZFSE	1
414. Support data for Unicode flag on HTML pattern attribute	1
415. Add support for svg fill-rule	1
416. Support for Unicode and spaces in URL	1
417. CMAF	1
418. css animation on “content:” - works on chrome, doesn't work on Safari and Firefox	1
419. Adding contain-intrinsic-size (suggestion)	1
420. Browser support for displaying the unicode block "Combining Diacritical Marks for Symbols"	1
421. Javascript pseudoprotocol	1
422. Chained selectors	1
423. Add H2 ORIGIN frame support	1
424. Add a matrix entyre for opentype-with-cff2	1
425. iframe disallowdocumentaccess property	1
426. DownloadURL	1
427. How to show support for font-variation-settings within @font-face?	1
428. supported-color-schemes & prefers-color-scheme	1
429. The event handler window.onscroll is missing	1
430. please add the onsearch event	1
431. step property of input field with type datetime-local and time	1
432. CSS3 new text-transform keywords	1
433. baseline-middle	1
434. Please add JavaScript string functions trimStart, trimEnd, trimRight, trimLeft	1
435. Support for calc() in polygon and other shapes	1
436. Use of es6 import statements in workers	1
437. line-height support and the differences in rendering between webkit&trident and other engines.	1
438. Support for Service Worker Life Cycle Events	1
439. OfflineAudioContext	1
440. Request: IPv6 proxy functions (myIpAddressEx and friends)	1
441. Add page for relative path in HTTP Location	1
442. https mixed mode	1
443. date.toLocaleString support tracking plz?	1
444. Clean up css-touch-action	1
445. Report Retry-After header support	1
446. online/offline can also be used as events and are not covered by caniuse.com (only boolean property is covered)	1
447. Add desynchronized (low latency canvas contexts)	1
448. Suggested addition: navigator.cpuClass	1
449. @top-left @bottom-center ? can you test for compatibility	1
450. Streams API: transferable streams	1
451. performance.measureMemory()	1
452. DeviceOrientation and DeviceMotion events on insecure origins	1
453. Open search autodiscovery	1
454. SHA1 certificates	1
455. aria-labelledby	1
456. nested calc() and var()	1
457. Missing `StorageQuota` support	1
458. Add support for CSS3 move-to property	1
459. Add XSL to caniuse	1
460. feature request: video/MP2T	1
461. reflected-xss missing	1
462. add mouse event positions event.offsetX and event.offsetY	1
463. Add MathML Core	1
464. Add compatibility data for QuickTime video format	1
465. Can you please add the Stack trace API that exists in V8	1
466. Add "Named function expressions"	1
467. Add Notification Triggers	1
468. Refresh	1
469. event.path	1
470. SHA2 certificates	1
471. column combination	1
472. Internationalized Domain Name	1
473. string-set	1
474. Add box-suppress	1
475. document type	1
476. Add Range.getBoundingClientRect browser support table	1
477. stroke-linecap support	1
478. Add support for the HTTP header X-Download-Options	1
479. Please add support for supported x509 extensions for ʜᴛᴛᴘꜱ certificates	1
480. Add css-timing	1
481. Add "Controlling Font Display Per Font-Family via @font-feature-values"	1
482. auto Picture-in-Picture	1
483. URLSearchParams.prototype.sort	1
484. No information about the `unselectable` HTML attribute.	1
485. Add support information for font metric override descriptors	1
486. Add app-region?	1
487. add aria-required to caniuse, if not already there	1
488. aria-current	1
489. bidi algorithm (for right-to-left Unicode characters)	1
490. FLoC support	1
491. Add High Resolution Time Level 3	1
492. add micropub	1
493. Add `::-webkit-details-marker`	1
494. Add: "color" and "background-color" CSS on <option> elements	1
495. Add URL Protocol Handler Registration for PWAs	1
496. [Suggestion] display: fullscreen	1
497. requestPostAnimationFrame browser support?	1
498. support data suggestion: DOM event constructors ?	1
499. E4X: ECMAScript for XML	1
500. Add `media` attribute for `<meta>` element (for `<meta name="theme-color">`)	1
501. Add "specifying a color profile: the `@color-profile` at-rule"	1
502. missing HTTP TRACE method	1
503. Add entry for DTLS 1.3	1
504. Support for CSS Color Module Level 5	1