Suggestion	Votes
1. Add HTTP 103 Early Hints	57
2. css/svg property dominant-baseline	43
3. Suggestion: MediaRecorder.isTypeSupported supported types/codecs	41
4. TLS ECH (Encrypted Client Hello), formerly known as ESNI (Encrypted Server Name Indication)	38
5. Add support for DNS RRs, like HTTPS and SVCB	33
6. + WASM SIMD	33
7. Entries for href values including `tel:1234567` and `sms:1234567`	32
8. WebExtensions (browser extensions)	31
9. Hyphenation Options	27
10. Add WebDriver	27
11. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	26
12. Can I use Reporting API	25
13. Show Support for JSON Modules	24
14. JavaScript: Tail Call Support information missing	23
15. Priority hints API	23
16. Add CSS property `caret-shape` and shorthand `caret`	21
17. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	21
18. XSLT Support table	21
19. Add ES7/2016 SIMD	21
20. border-corner-shape	21
21. Add CSS Grid Layout Module Level 3 (Masonry!)	21
22. External import maps	21
23. Native HTML Switches	20
24. New feature: CSS Typed Object Model (CSS Typed OM)	20
25. device-cmyk css feature	19
26. Add CSS `field-sizing` (previously `form-sizing`)	18
27. Support constructible stylesheets / adoptedStyleSheets	18
28. Page Lifecycle API	17
29. Geo URI scheme	17
30. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	16
31. Add ShadowRealm API	16
32. ElementInternals/form-associated custom element	15
33. `content: leader('.');`	15
34. Add Webassembly Threads / Threaded Webassembly	15
35. Support Intrinsic Size Attribute	15
36. SVGZ-specific support table since iOS < 4.2 doesn't support it, but does support SVG. Not su...	15
37. input-security	14
38. Color Fonts including SVG-in-OT fonts	13
39. Add Web Share Target API	13
40. I suggest support for TransferableObject types (of which there are several)	13
41. Add the Popover API (ex: Pop Up API aka. the `popup` attribute plus more)	13
42. New feature request: OCSP must-staple	13
43. Async iterators / for await of	13
44. Page-margin boxes (@top-center, etc)	12
45. CSS Box Alignment Module Level 3	12
46. Soft hyphen: html entity &shy;	12
47. webM alpha transparency	12
48. Add float: footnote to CSS3	12
49. Support for SVG's "shape-rendering" CSS property.	12
50. Add WebRTC insertable streams	11
51. webcl?	11
52. Add the `<search>` element	11
53. Add the Quite OK Image Format (QOI) …maybe eventually	11
54. Add caniuse data for Contact Picker API	11
55. Add "outline follows border-radius"	11
56. CSS3 Speech Module Which browsers support it? See	11
57. [Request] Please add Web Assembly Garbage Collection (WasmGC)	11
58. Support CSS two-value display syntax	10
59. SVG viewport-fill property support	10
60. Add Report-To API (Intervention Reports)	10
61. one-time-code	10
62. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	10
63. caniuse : Constructable Stylesheet	10
64. Track Intl.Segmenter	10
65. Badging API	10
66. Add Web Share Level 2	10
67. queueMicrotask support	10
68. Add `WebOTP` to list of apis	10
69. @font-face descriptors to override font metrics	10
70. Add: Webassembly Garbage Collection	10
71. Add CSS Custom Highlight API	10
72. Include `baseline-shift` CSS property	10
73. CSS 3 property: text-autospace and text-spacing	10
74. Add "HDR AVIF" image support	9
75. List support for the window.fetch keepalive option	9
76. HTTP2 Server Push	9
77. Cookies: max-age	9
78. Tiff image format	9
79. Add CSS animation timing function spring()	9
80. SVG viewport-fill-opacity property support	9
81. Add supported elliptical curves (HTTPS/TLS)	9
82. Add SVG `use` with external reference	9
83. Quota Management API	9
84. Add Versatile Video Coding (VVC) … somewhen	8
85. WebGL extensions	8
86. Add text-wrap: pretty	8
87. Add CSS property -- `object-view-box`	8
88. input[autocomplete] (values besides on/off)	8
89. Add support for @starting-style rule	8
90. User-Agent Client Hints (UA-CH)	8
91. Add tracking for Explicit Resource Management (`using` and `await using`)	8
92. -ms-overflow-style	8
93. autocorrect for input fileds	7
94. Secure Cookie flag	7
95. Add support for Private State Tokens	7
96. Audio codec - xHE-AAC / USAC	7
97. This regards adding support for the navigator.userAgentData	7
98. Add the HTML focusgroup attribute	7
99. New feature request: x25519 Key Exchange	7
100. Alt-Svc header browser support info: consider adding	7
101. Feature: Origin-bound one-time codes delivered via SMS	7
102. Add 'require-sri-for' CSP Directive	7
103. RFC7692 Compression Extensions for WebSocket	7
104. Support for the frame-ancestors directive	7
105. Add `multipart/x-mixed-replace`	7
106. Add Fetch upload streaming	7
107. HTML Modules	7
108. Please add "isInputPending()"	7
109. Add `WebSocketStream` API	7
110. Add support for iterator helpers	7
111. Add `enterkeyhint` attribute ("Enter Key Hint")	6
112. Add tracking for "Ultra HDR JPG"	6
113. USDZ file format	6
114. Add ECC certificates	6
115. Add Web Neural Network (WebNN)	6
116. add Accessibility Object Model	6
117. Add System Colors item	6
118. CSS tag {content: url()}	6
119. Support 'name' attribute on <details> ("Accordion pattern using name attribute on <details> elements")	6
120. Accelerated Shape Detection in Images	6
121. Observable	6
122. Cannot see |ImageCapture| entry in the web interface.	6
123. Window Placement API	6
124. new CSS trigonometry functions	6
125. Flag storage that is not available under private mode	6
126. Support for MHTML	6
127. WebCrypto Key Discovery	6
128. CanIUse OpenSearch	6
129. Add Web Share Target API Level 2	6
130. Geofencing API	6
131. Add autocorrect, autocapitalize, autocomplete attributes	6
132. WebP & AVIF favicons	6
133. MediaStream Image Capture	6
134. Add CSS Values and Units Module Level 4 Mathematical Expressions	6
135. Embedded color profiles in JPEG images.	6
136. Add the `:modal` pseudo-class	6
137. Module Worker support	6
138. CSS Round Display	5
139. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	5
140. Input Events Level 1 and 2	5
141. Add support tables for document.documentElement.clientWidth	5
142. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
143. Adding Khronos gITF 2.0 for 3D models	5
144. Tracking various WebAuthn features	5
145. Add the `<model>` element	5
146. Add IPFS (Interplanetary File System) protocol to Caniuse	5
147. Global Privacy Control (GPC) "Sec-GPC" HTTP header	5
148. webp2 support	5
149. roundRect	5
150. Add "page based counters"	5
151. JS Self-Profiling API	5
152. Add Incremental Font Transfer	5
153. add window-inactive pseudo-class	5
154. Feature: A Well-Known URL for Changing Passwords	5
155. Bundled HTTP Exchanges	5
156. Add font-palette-values	5
157. Support individual CSP rules	5
158. Popover API	5
159. Add Intl.DurationFormat	5
160. Payment Handler API	5
161. Add raw sockets API	5
162. Add supports() queries on @import	5
163. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
164. audio / video autoplay attribute and play function	5
165. CSS Shaders -	5
166. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	5
167. Input type=email with "multiple" attribute	5
168. Please track the various HTTP Set-Cookie options supported by browsers	5
169. HTTP Strict Transport Security Preload	5
170. Add "CICP in images"	5
171. Add HTTP method: QUERY	5
172. Add gRPC support	4
173. File Handling API	4
174. Support aria-hidden html property	4
175. [CSS Level 4 pseudo-class] :user-error	4
176. Support for Geometry Property (SVG 2.0) `r` in CSS	4
177. documentMode	4
178. Add Local Font Access API	4
179. Support for Digital Goods API	4
180. Add support for passwordrules input attribute	4
181. Support SVG width/height = auto	4
182. Graphite font support	4
183. Web locks	4
184. Support information for horizontal-viewport-segments and vertical-viewport-segments	4
185. SVG sprites with <symbol> and <use>	4
186. Add Cookie Store API	4
187. webkit-calendar-picker-indicator	4
188. filename*=UTF-8''...	4
189. Cache-Control	4
190. Add Intl.DisplayNames	4
191. Add meta "format-detection"	4
192. X25519Kyber768 Hybrid Post-Quantum Key Exchange for HTTPS	4
193. Snap Events: scrollsnapchange and scrollsnapchanging	4
194. SameParty cookie attribute	4
195. Screen Capture	4
196. CSS image() functional notation (e.g. for background-images etc). See	4
197. Arithmetic coded JPEG support	4
198. Add Media Session API Coverage Information	4
199. The !important css thing. It's very !important ;).	4
200. New top level domains (TLD)	4
201. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
202. Accessibility of in-browser PDF Viewer	4
203. Add Invokers, currently `invoketarget` & `invokeaction`	4
204. ::-webkit-file-upload-button	4
205. Support the W3 Web Annotation standard (W3C Recommendation)	4
206. Add server-timing as a trailer	4
207. Public class properties	3
208. No information about the `unselectable` HTML attribute.	3
209. Add `dynamic-range` media query	3
210. CSS view-timeline supports	3
211. Show ANSI escape code for console.log.	3
212. Add "Window Controls Overlay"	3
213. Video media in image contexts	3
214. Add Wide Color Gamut in 2D Canvas	3
215. Let's add a page for box alignment	3
216. justify-content: space-around	3
217. display: table-caption?	3
218. Web bundles	3
219. Add CMYK Color Space	3
220. Missing feature: Clipboard API supported mimetypes	3
221. video codecs	3
222. New browser feature: rest/spread in object literals	3
223. Add support for HTTP header X-Permitted-Cross-Domain-Policies	3
224. Support for CSS3 background-repeat-x and background-repeat-y properties	3
225. Add 'animated GIF as favicon'?	3
226. IPv6 support in web browsers	3
227. add iframe.csp	3
228. Add support for requestSubmit	3
229. place-items shorthand for justify and align	3
230. Add support for addHitRegion	3
231. Support new global attribute: writingsuggestions	3
232. Content-Security-Policy: script-nonce	3
233. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	3
234. Private Click Measurement (PCM)	3
235. CSS multicol data is mixed with fragmentation	3
236. ECMAscript - static properties	3
237. Can I Use m4a?	3
238. getEventListeners not listed	3
239. Safe Assignment Operator	3
240. Add "Responsive Video" aka. `media` attribute for `<source>` element in `<video>`	3
241. Add information for the webcal and webcals protocols for subscribing to iCalendars	3
242. Add information on context-stroke and context-fill	2
243. Track the status of the JavaScript Promise Integration specification	2
244. Add Integrated Windows Authentication	2
245. text-space-collapse	2
246. rel="ar" support	2
247. Add Geolocation Sensor	2
248. Add browser support for toggle()	2
249. <semantics> element in MathML is not found in caniuse.com	2
250. x-webkit-speech	2
251. Add the Javascript double asterisk power operator (**) to the list of supported features	2
252. Add Date.prototype.toTemporalInstant()	2
253. Bitmap images inside SVG files. Some browsers that support SVG, will not show embedded bitmap image...	2
254. add RTSP and RTSP 2.0 (Real Time Streaming Protocol)	2
255. Add "Scheduled Task API"	2
256. `from-image` as initial value of `image-orientation`	2
257. Show which browsers have a native CSV viewer	2
258. Please add more detailed WebRTC features	2
259. Add `letter-spacing` support for percentage values	2
260. Add chrome.webrequests	2
261. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
262. WebXR Hand Input Module - Level 1	2
263. Tooltip display on focus	2
264. "GeometryUtils" - part of the CSSOM. Provides much better position information than existi...	2
265. Support for hrefTranslate	2
266. Metadata name: MobileOptimized	2
267. Metadata name: HandheldFriendly	2
268. UTF-8 Dingbats	2
269. What about showing support for various link attributes, like "subresource" or "dns-pr...	2
270. support destructuring assignment as separate es feature	2
271. Touch Icons (apple-touch-icon)	2
272. stroke-linejoin support	2
273. Request: nav-up, nav-down, nav-left, nav-right css3 properties	2
274. Add Container Units aka. Container Relative Lengths	2
275. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	2
276. Input type=range with "multiple" attribute	2
277. track support for the media query feature -ms-high-contrast	2
278. Support of sms: and mms: in mobile browsers is not clear	2
279. Track adoption of DOMFrameContentLoaded event	2
280. A new page for Grid track animation should be added	2
281. Add VisualViewport.segments support data	2
282. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
283. SVG image auto height	2
284. Add PNG cursor	2
285. console.assert(boolean_expression)	2
286. viewport meta tag	2
287. add "unicode property escapes"	2
288. Add HTTP_ORIGIN feature	2
289. EventTarget Constructor	2
290. add secure payment confirmation (W3C)	2
291. Spatial Navigation support	2
292. CSS word-break: 'auto-phrase' and 'manual'	2
293. SharedMemory/Atomics	2
294. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
295. DNS-over-HTTPS (DoH)	2
296. SSML	2
297. add csp lv2 violation event	2
298. Drag and Drop API - ghost image with customizable opacity	2
299. Add TPG image file format	2
300. add captureVisibleTab	2
301. Support Experimental "ES Pipe Operator (|>)"	2
302. CSS touch-action level 2 values	2
303. srcset/sizes attribute / picture element support in SVG	2
304. String.prototype.split() with a regex with grouping ( parentheses ).	2
305. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	2
306. getFilesAndDirectories	2
307. SVG symbols in CSS	2
308. setTimeout and setInterval callback parameters	2
309. Device-Memory Client Hint & navigator.deviceMemory JS API	2
310. HTTP immutable responses	2
311. Add app-region?	2
312. Storage Access API	2
313. Add block-step-size property for CSS	2
314. HTTP Trailers	2
315. onerror event on iframe	2
316. Loading Signed Exchanges	2
317. Basic Authentication: AuthName directive	2
318. Support KV Storage build-in module	2
319. Can I use X3D?	2
320. View Transitions Module Level 2	2
321. Add auto-expand `<details>` for find-in-page and fragment navigations	2
322. dns.resolve	2
323. Animating SVG paths using CSS	2
324. Add CSS4 Grid structural selectors	2
325. prefers-reduced-transparency CSS Media Query	1
326. Add Payment Request API 1.1	1
327. Support HTJ2K	1
328. Add standalone MathML files in MML format	1
329. TLS Encrypted Client Hello (ECH)	1
330. Add `:local-link` pseudo selector	1
331. MPNG	1
332. Add Web Preferences API …maybe eventually	1
333. Add Device Posture API (formerly Screen Fold API)	1
334. Content-Security-Policy: navigate-to	1
335. Add Background Blur API	1
336. mediacapture-region	1
337. Add URL.canParse()	1
338. Add WICG/compression-dictionary-transport	1
339. Add variable units	1
340. udp: add feature	1
341. import reflection for WASM	1
342. Add `new Intl.DateTimeFormat().resolvedOptions().hour12`	1
343. Support for CSS Color Module Level 5	1
344. CSS property media-controls-panel	1
345. Add Memory64 browser feature	1
346. Adding Managed Media Source	1
347. Add `@font-feature-values`	1
348. Opus: Need data for MP4 and WebM containers	1
349. Add Web MIDI 2.0 …maybe eventually	1
350. Add `blocking=render`	1
351. Add "Scoped Custom Element Registry" as it is now behind an experimental feature flag in Chrome	1
352. `border-color: currentColor;`	1
353. Add IndexedDB 3.0	1
354. Add `Notification.prototype​.showTrigger️`	1
355. Add optional type syntax for JavaScript …maybe eventually	1
356. Add `font-variant-emoji`	1
357. viewport-fit	1
358. WebSerial	1
359. Add `PWA file handlers`	1
360. SVG 2: inline-size property for text	1
361. Browser support for Running elements	1
362. Add selection.getComposedRange() feature check	1
363. CAA DNS record	1
364. Add `target="_new"`	1
365. Suggestion: @font-face src OpenType collection support	1
366. Web monetization	1
367. Add CSS `@property`	1
368. Add Capture Handle	1
369. 32-bit HDR PNG	1
370. Feature request: tc39 Explicit Resource Management	1
371. Please add TLS certificate algorithms to caniuse	1
372. Add Isolated Web Apps (IWAs)	1
373. Add CSS Scroll Snap Module Level 2	1
374. Add WebDriver BiDi	1
375. Playback of videos with alpha channel	1
376. CSS generated images: Stripes	1
377. Support of webkitAudioDecodedByteCount	1
378. Add Change Array by Copy methods	1
379. Add `@supports at-rule`	1
380. Add CSS Toggles …maybe eventually	1
381. Add Gradient Interpolation Color Spaces	1
382. Add tech() function support (in @font-face src)	1
383. sec-ch-prefers headers	1
384. X.509 Name Constraints	1
385. Please add support data for "CSS property: clip-path: inset()". Thank you!	1
386. 'font-size' descriptor for '@font-face'	1
387. Support for VSR (Video Super Resolution) on Nvidia and Intel GPUs	1
388. Add tracking for ASTC hdr profile	1
389. Audio format: AC-3, eac3	1
390. Add "method of opting into following the visual order", currently `focus-order` …maybe eventually	1
391. Sec-Ch-wow64	1
392. Add Web Translation API …maybe eventually	1
393. <object>.contentWindow Support	1
394. Add Notification Triggers	1
395. SHA1 certificates	1
396. string-set	1
397. Internationalized Domain Name	1
398. column combination	1
399. SHA2 certificates	1
400. event.path	1
401. Add "Named function expressions"	1
402. Open search autodiscovery	1
403. add mouse event positions event.offsetX and event.offsetY	1
404. reflected-xss missing	1
405. Add XSL to caniuse	1
406. Add support for CSS3 move-to property	1
407. Missing `StorageQuota` support	1
408. aria-labelledby	1
409. Add support for the HTTP header X-Download-Options	1
410. document type	1
411. add micropub	1
412. support data suggestion: DOM event constructors ?	1
413. [Suggestion] display: fullscreen	1
414. Add High Resolution Time Level 3	1
415. Add css-timing	1
416. aria-current	1
417. add aria-required to caniuse, if not already there	1
418. URLSearchParams.prototype.sort	1
419. Add "Controlling Font Display Per Font-Family via @font-feature-values"	1
420. Please add support for supported x509 extensions for ʜᴛᴛᴘꜱ certificates	1
421. Chained selectors	1
422. Javascript pseudoprotocol	1
423. Browser support for displaying the unicode block "Combining Diacritical Marks for Symbols"	1
424. Support for Unicode and spaces in URL	1
425. Add box-suppress	1
426. Add Range.getBoundingClientRect browser support table	1
427. HTTP Content-encoding: LZFSE	1
428. IETF RFCs	1
429. I suggest adding information about support for alternate HTTP methods such as PUT and PATCH.	1
430. Textarea wrap attribute (off, soft, hard, virtual, physical)	1
431. Support for XPath 2.0 (interesting for a lot of new functions, like base-uri(), matches() etc.)	1
432. <meta name="apple-mobile-web-app-capable" content="yes" />	1
433. accesskey attribute on non-focusable elements (should cause a click element to fire	1
434. MediaStream Recording (	1
435. The hanging-punctuation property: Currently unsupported by any browser, but it would be nice to ...	1
436. image-resolution. I've seen this as a good alternative for retina images as opposed to backgro...	1
437. script tag onerror attribute	1
438. Suggestion for caniuse.com: Which browsers.versions support multiple tbody elements in a single table?	1
439. create @Media Types	1
440. longdesc attribute support	1
441. CSS Inline Layout	1
442. Feature request: Token Binding Protocol	1
443. DeviceOrientation and DeviceMotion events on insecure origins	1
444. add onstorage	1
445. Add WebKit Tap Highlight Color (-webkit-tap-highlight-color)?	1
446. Add windows-theme media query selector	1
447. window.localMediaStream is not listed	1
448. The xml:space attribute	1
449. show support for namespacing; for example <svg: namespace	1
450. Add Object.prototype.watch method	1
451. browserconfig.xml support info	1
452. request support for 'accept-charset'	1
453. add CSS Extensions meant for renaming	1
454. Add a footnote regarding HTMLAudioElement	1
455. Support info for the <track> element	1
456. Drag and Drop API - move constraints	1
457. Audio Output Devices API: wd	1
458. Support data for Unicode flag on HTML pattern attribute	1
459. Suggestion: support for margin-collapse?	1
460. Add compatibility data for QuickTime video format	1
461. bidi algorithm (for right-to-left Unicode characters)	1
462. What is the browser support for the newly proposed "page-orientation" property?	1
463. Add layout-instability support	1
464. Information about WavPack audio format	1
465. InsertKey Behaviour Overwrite/Normal Mode	1
466. Add support for svg fill-rule	1
467. CMAF	1
468. css animation on “content:” - works on chrome, doesn't work on Safari and Firefox	1
469. Adding contain-intrinsic-size (suggestion)	1
470. Streams API: transferable streams	1
471. iframe disallowdocumentaccess property	1
472. performance.measureMemory()	1
473. auto Picture-in-Picture	1
474. Add support information for font metric override descriptors	1
475. FLoC support	1
476. Add Support for MPEG-4 Part 2 SP/ASP	1
477. Add `::-webkit-details-marker`	1
478. Add: "color" and "background-color" CSS on <option> elements	1
479. Add URL Protocol Handler Registration for PWAs	1
480. requestPostAnimationFrame browser support?	1
481. E4X: ECMAScript for XML	1
482. Add `media` attribute for `<meta>` element (for `<meta name="theme-color">`)	1
483. Add "specifying a color profile: the `@color-profile` at-rule"	1
484. missing HTTP TRACE method	1
485. Add entry for DTLS 1.3	1
486. Can you please add the Stack trace API that exists in V8	1
487. stroke-linecap support	1
488. nested calc() and var()	1
489. feature request: video/MP2T	1
490. Add MathML Core	1
491. x-webkit-airplay	1
492. @top-left @bottom-center ? can you test for compatibility	1
493. Add: Tracking Preference Expression APIs	1
494. OfflineAudioContext	1
495. Missing computed property names	1
496. Character-based alignment in a table column using text-align	1
497. [Feature Policy: sub-feature] Sandbox features	1
498. window.watchMedia()	1
499. Add compatibility for FormData	1
500. Add H2 ORIGIN frame support	1
501. Add a matrix entyre for opentype-with-cff2	1
502. Support for Service Worker Life Cycle Events	1
503. Suggested addition: navigator.cpuClass	1
504. online/offline can also be used as events and are not covered by caniuse.com (only boolean property is covered)	1
505. Report Retry-After header support	1
506. date.toLocaleString support tracking plz?	1
507. https mixed mode	1
508. Add page for relative path in HTTP Location	1
509. DownloadURL	1
510. Add desynchronized (low latency canvas contexts)	1
511. Use of es6 import statements in workers	1
512. CSS3 new text-transform keywords	1
513. step property of input field with type datetime-local and time	1
514. please add the onsearch event	1
515. supported-color-schemes & prefers-color-scheme	1
516. line-height support and the differences in rendering between webkit&trident and other engines.	1
517. Refresh	1
518. How to show support for font-variation-settings within @font-face?	1
519. The event handler window.onscroll is missing	1
520. baseline-middle	1
521. Please add JavaScript string functions trimStart, trimEnd, trimRight, trimLeft	1
522. Support for calc() in polygon and other shapes	1
523. Request: IPv6 proxy functions (myIpAddressEx and friends)	1
524. Clean up css-touch-action	1
525. Add caret-animation	1