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