Suggestion	Votes
1. Add `text-edge` and `leading-trim`	67
2. vector-effect	31
3. Add support table for CSP 3.0 compliance	27
4. HTTP content-encoding: zstd	25
5. Support JavaScript Class and Property Decorators (ES Stage 2 Draft)	23
6. window.onerror - / - particularly mobile browser support	23
7. Suggestion: MediaRecorder.isTypeSupported supported types/codecs	23
8. css/svg property dominant-baseline	22
9. valueAsDate usage	22
10. Can I use Reporting API	22
11. Add WebDriver	22
12. Add JPEG-XL	21
13. Add ES7/2016 SIMD	20
14. form input property "valueAsNumber"	20
15. text-wrap	19
16. Priority hints API	18
17. CSS3 module "Generated Content for Paged Media" and especially the target-counter function	18
18. Add lab() and lch() from CSS Color Module Level 4	18
19. I suggest adding statistics for Aural style sheets which contain CSS properties such as "speak....	18
20. JavaScript: Tail Call Support information missing	17
21. XSLT Support table	17
22. Entries for href values including `tel:1234567` and `sms:1234567`	17
23. New feature: CSS Typed Object Model (CSS Typed OM)	17
24. Add HTTP 103 Early Hints	16
25. WebExtensions (browser extensions)	16
26. Support Intrinsic Size Attribute	15
27. ESNI (Encrypted Server Name Indication)	15
28. Hyphenation Options	15
29. border-corner-shape	15
30. Add CSS Grid Layout Module Level 3 (Masonry!)	14
31. Page Lifecycle API	14
32. device-cmyk css feature	14
33. Check browser support for displaying MJPEG files. This is a motion JPEG file format that is supporte...	13
34. <video> `playsinline` attribute	13
35. Add hwb() CSS function	13
36. Add Media Queries Ranges	13
37. Add beforeinput event	13
38. `content: leader('.');`	13
39. text-security missing in list of features	12
40. I suggest support for TransferableObject types (of which there are several)	12
41. SVGZ-specific support table since iOS < 4.2 doesn't support it, but does support SVG. Not su...	12
42. Support constructible stylesheets / adoptedStyleSheets	12
43. Geo URI scheme	11
44. Add CSS Color Module Level 5 (color-adjust(), color-mix(), color-contrast())	11
45. Soft hyphen: html entity &shy;	11
46. Async iterators / for await of	11
47. CSS Box Alignment Module Level 3	10
48. Add CSS Nesting	10
49. webcl?	10
50. Color Fonts including SVG-in-OT fonts	10
51. Add Report-To API (Intervention Reports)	10
52. Paint Timing API	10
53. Please add iFrame element contentWindow property	9
54. CSS3 Speech Module Which browsers support it? See	9
55. Quota Management API	9
56. New feature request: OCSP must-staple	9
57. Cookies: max-age	9
58. Support for SVG's "shape-rendering" CSS property.	9
59. queueMicrotask support	9
60. webM alpha transparency	8
61. Progressive JPEGs start to show on pages faster, from low quality and eventually getting their 100% ...	8
62. Add float: footnote to CSS3	8
63. Include `baseline-shift` CSS property	8
64. Add CSS animation timing function spring()	8
65. Support for the frame-ancestors directive	7
66. input[autocomplete] (values besides on/off)	7
67. Add supported elliptical curves (HTTPS/TLS)	7
68. HTTP2 Server Push	7
69. Multicolor Glyph support (COLR/CPAL)	7
70. RFC7692 Compression Extensions for WebSocket	7
71. SVG viewport-fill property support	7
72. SVG viewport-fill-opacity property support	7
73. CSS max-lines	7
74. Alt-Svc header browser support info: consider adding	7
75. List support for the window.fetch keepalive option	7
76. WebGL extensions	7
77. 'imagesizes' & 'imagesrcset' for <link rel="preload">	7
78. Badging API	7
79. Add support for the __Host- and __Secure-	7
80. Add SVG `use` with external reference	7
81. ElementInternals/form-associated custom element	7
82. + WASM SIMD	7
83. Please add "isInputPending()"	7
84. Secure Cookie flag	6
85. Add Web Share Target API	6
86. Add `multipart/x-mixed-replace`	6
87. Add scroll-padding	6
88. Add Web Share Level 2	6
89. HTML Modules	6
90. Cannot see |ImageCapture| entry in the web interface.	6
91. Fetch Metadata Request Headers	6
92. Flag storage that is not available under private mode	6
93. CSS tag {content: url()}	6
94. caniuse : Constructable Stylesheet	6
95. Add caniuse data for Contact Picker API	6
96. Add save-data client hint	6
97. Add 'require-sri-for' CSP Directive	6
98. CSS unit 'cap' (cap-height)	6
99. Add enterkeyhint attribute ("Enter Key Hint")	6
100. New feature request: x25519 Key Exchange	6
101. Suggestion: overflow(-[xy])? with 'overlay' value	6
102. MediaStream Image Capture	6
103. autocorrect for input fileds	6
104. Geofencing API	6
105. -ms-overflow-style	5
106. Adding Khronos gITF 2.0 for 3D models	5
107. Please track the various HTTP Set-Cookie options supported by browsers	5
108. add support for PerformanceLongTaskTiming	5
109. audio / video autoplay attribute and play function	5
110. Module Worker support	5
111. WebCrypto Key Discovery	5
112. Accelerated Shape Detection in Images	5
113. Add support tables for document.documentElement.clientWidth	5
114. @font-face descriptors to override font metrics	5
115. Feature: Origin-bound one-time codes delivered via SMS	5
116. Add isSecureContext feature to list	5
117. mediagroup content attribute, MediaController object, VideoTrackList, AudioTrackList objects	5
118. one-time-code	5
119. HTMLVideoElement.requestVideoFrameCallback()	5
120. Track support for navigator.getInstalledRelatedApps()	5
121. -webkit-box-orient is not found	5
122. Add autocorrect, autocapitalize, autocomplete attributes	5
123. Support individual CSP rules	5
124. Observable	5
125. Embedded color profiles in JPEG images.	5
126. Add info about css user-modify and -webkit-user-modify:read-write-plaintext-only	5
127. Support CSS two-value display syntax	5
128. Add previousSibling and previousElementSibling	4
129. [CSS Level 4 pseudo-class] :user-error	4
130. Serial API	4
131. Cache-Control	4
132. CSS 3 property: text-autospace and text-spacing	4
133. Feature: A Well-Known URL for Changing Passwords	4
134. Add raw sockets API	4
135. CSS Round Display	4
136. Payment Handler API	4
137. Bundled HTTP Exchanges	4
138. Page-margin boxes (@top-center, etc)	4
139. `Cross-Origin-Embedder-Policy` HTTP header	4
140. For printing support for the size:landscape option to tell the browser what page orientation we want...	4
141. CSS image() functional notation (e.g. for background-images etc). See	4
142. Screen Capture	4
143. User-Agent Client Hints (UA-CH)	4
144. Add mediaSession API	4
145. Support the W3 Web Annotation standard (W3C Recommendation)	4
146. TCP Fast-Open. Now that Linux kernels enable this by default (and web servers likely won't be ...	4
147. New top level domains (TLD)	4
148. Arithmetic coded JPEG support	4
149. Add Web Share Target API Level 2	4
150. Add `text-underline-offset` property	4
151. USDZ file format	4
152. Web locks	4
153. HTTP Strict Transport Security Preload	4
154. Support aria-hidden html property	4
155. Add Cookie Store API	4
156. Add WebRTC insertable streams	4
157. Add window.showOpenFilePicker	4
158. WebTransport	4
159. Feature addition: navigator.mediaCapabilities.decodingInfo()	4
160. CSS Shaders -	4
161. Track CSS `scroll-snap-stop`	3
162. The !important css thing. It's very !important ;).	3
163. Add Media Session API Coverage Information	3
164. Add Versatile Video Coding (VVC) … somewhen	3
165. Add support for addHitRegion	3
166. SVG sprites with <symbol> and <use>	3
167. Add Intl.DisplayNames	3
168. Add Webassembly Threads / Threaded Webassembly	3
169. place-items shorthand for justify and align	3
170. display: table-caption?	3
171. Add data for link rel="alternate"	3
172. getTotalLength()	3
173. ActiveX	3
174. Add meta "format-detection"	3
175. new CSS trigonometry functions	3
176. Network Service Discovery	3
177. New browser feature: rest/spread in object literals	3
178. Support for MHTML	3
179. Add support for requestSubmit	3
180. Support SVG width/height = auto	3
181. Keyboard Lock	3
182. Add ECC certificates	3
183. <virtual-scroller>	3
184. ::-webkit-file-upload-button	3
185. navigator.isProtocolHandlerRegistered and .unregisterProtocolHandler	3
186. Add <data> element	3
187. Adding Silverlight usage stats	3
188. Add font-palette-values	3
189. Input Events Level 1 and 2	3
190. Public class properties	3
191. Grid-auto-flow	3
192. ECMAscript - static properties	3
193. allowtransparency	3
194. add window-inactive pseudo-class	3
195. event.ctrlKey	3
196. Feature suggestion: add "scrollRestoration" for the History API	2
197. Add Integrated Windows Authentication	2
198. Content-Security-Policy: block-all-mixed-content	2
199. add Accessibility Object Model	2
200. Add Geolocation Sensor	2
201. getEventListeners not listed	2
202. setTimeout and setInterval callback parameters	2
203. ::-webkit-inner-spin-button ::-webkit-outer-spin-button	2
204. Loading Signed Exchanges	2
205. What about showing support for various link attributes, like "subresource" or "dns-pr...	2
206. Add new SVG filter effects	2
207. add csp lv2 violation event	2
208. add captureVisibleTab	2
209. Support for Canvas isPointInPath()	2
210. SVG image auto height	2
211. Feature addition: navigator.mediaCapabilities.encodingInfo()	2
212. Add `import.meta`	2
213. Why not suggests 'setPrototypeOf '	2
214. .getPointAtLength()	2
215. CSS page property (for printing)	2
216. add iframe.csp	2
217. UTF-8 Dingbats	2
218. <semantics> element in MathML is not found in caniuse.com	2
219. http://www.w3.org/TR/web-alarms/	2
220. Add PNG cursor	2
221. Add information for the webcal and webcals protocols for subscribing to iCalendars	2
222. Remote Playback API	2
223. for ... of support data	2
224. SSML	2
225. SVG Foreign Object is a way to combine different XML namespaces elements into the SVG.	2
226. Wildcard "*" support for Access-Control-Allow-Headers/Methods	2
227. getFilesAndDirectories	2
228. Feature suggestion: Top level `await`	2
229. Tiff image format	2
230. Spatial Navigation support	2
231. Device-Memory Client Hint & navigator.deviceMemory JS API	2
232. Please add attachInternals	2
233. Add information about CSS pseudo selector :defined	2
234. HTTP immutable responses	2
235. Load event support on link nodes to show when a stylesheet is finished loading. See for a discussio...	2
236. Add `q` (quarter-millimeters) length unit	2
237. InputDeviceCapabilities API	2
238. EventTarget Constructor	2
239. The "auto" value for the dir attribute, added in HTML5 to ease inserting text of unknown d...	2
240. Please add ES3 support	2
241. Container media queries	2
242. <input type=file>: ability to modify the selected files via JS	2
243. track support for the media query feature -ms-high-contrast	2
244. SharedMemory/Atomics	2
245. console.assert(boolean_expression)	2
246. x-webkit-speech	2
247. Support KV Storage build-in module	2
248. add "unicode property escapes"	2
249. HTTP Trailers	2
250. Storage Access API	2
251. support destructuring assignment as separate es feature	2
252. onerror event on iframe	2
253. Can I use X3D?	2
254. Basic Authentication: AuthName directive	2
255. Which browsers adhere to ETag?	2
256. Add support for FlyWeb API	2
257. Add 'animated GIF as favicon'?	2
258. Add browser support for toggle()	2
259. justify-content: space-around	2
260. Input type=email with "multiple" attribute	2
261. Add Web Budget API	2
262. Support for CSS3 background-repeat-x and background-repeat-y properties	2
263. I would like to know which browsers support the forceSpellCheck() method (	2
264. Default function parameters	2
265. Show ANSI escape code for console.log.	2
266. String.prototype.split() with a regex with grouping ( parentheses ).	2
267. srcset/sizes attribute / picture element support in SVG	2
268. Add transitionstart event	2
269. Bitmap images inside SVG files. Some browsers that support SVG, will not show embedded bitmap image...	2
270. Support of sms: and mms: in mobile browsers is not clear	2
271. CSS3 marquee support.	2
272. CSS touch-action level 2 values	2
273. Content-Security-Policy: script-nonce	2
274. filename*=UTF-8''...	2
275. Add other values of `user-select` property	2
276. Add HTMLInputElement.select()	2
277. documentMode	2
278. Directional focus navigation: the nav-up, nav-right, nav-down, nav-left properties	2
279. Web intents/Web Activities	1
280. Refresh	1
281. accesskey attribute on non-focusable elements (should cause a click element to fire	1
282. Add support for CSS clip property	1
283. OfflineAudioContext	1
284. The event handler window.onscroll is missing	1
285. <meta name="apple-mobile-web-app-capable" content="yes" />	1
286. Support for XPath 2.0 (interesting for a lot of new functions, like base-uri(), matches() etc.)	1
287. Support Data Suggestion: Clients API	1
288. please add the onsearch event	1
289. <object>.contentWindow Support	1
290. DownloadURL	1
291. Touch Icons, per	1
292. Use of es6 import statements in workers	1
293. step property of input field with type datetime-local and time	1
294. Add Window.stop	1
295. supported-color-schemes & prefers-color-scheme	1
296. CSS3 new text-transform keywords	1
297. How to show support for font-variation-settings within @font-face?	1
298. browserconfig.xml support info	1
299. Add information on context-stroke and context-fill	1
300. dns.resolve	1
301. Streams API: transferable streams	1
302. Add Sanitizer API	1
303. Track adoption of DOMFrameContentLoaded event	1
304. I suggest adding information about support for alternate HTTP methods such as PUT and PATCH.	1
305. CMAF	1
306. css animation on “content:” - works on chrome, doesn't work on Safari and Firefox	1
307. Adding contain-intrinsic-size (suggestion)	1
308. Tracking various WebAuthn features	1
309. CanIUse OpenSearch	1
310. Add `::target-text` (from CSS Pseudo-Elements Module Level 4)	1
311. webkit-calendar-picker-indicator	1
312. iframe disallowdocumentaccess property	1
313. InsertKey Behaviour Overwrite/Normal Mode	1
314. performance.measureMemory()	1
315. JS Self-Profiling API	1
316. line-height support and the differences in rendering between webkit&trident and other engines.	1
317. `from-image` as initial value of `image-orientation`	1
318. auto Picture-in-Picture	1
319. Metadata name: HandheldFriendly	1
320. Metadata name: MobileOptimized	1
321. Support for hrefTranslate	1
322. Track Intl.Segmenter	1
323. device-pixel-content-box for ResizeObserver	1
324. Add support for svg fill-rule	1
325. Information about WavPack audio format	1
326. baseline-middle	1
327. HTMLInputElement API: select support	1
328. Please add JavaScript string functions trimStart, trimEnd, trimRight, trimLeft	1
329. Support for calc() in polygon and other shapes	1
330. MediaTrackConstraints	1
331. Add Text.wholeText property	1
332. Request: IPv6 proxy functions (myIpAddressEx and friends)	1
333. Clean up css-touch-action	1
334. Document Policies	1
335. https mixed mode	1
336. Add desynchronized (low latency canvas contexts)	1
337. @top-left @bottom-center ? can you test for compatibility	1
338. Add Support for MPEG-4 Part 2 SP/ASP	1
339. Missing feature: Clipboard API supported mimetypes	1
340. grid-row-gap and grid-column-gap	1
341. Textarea wrap attribute (off, soft, hard, virtual, physical)	1
342. Add the Javascript double asterisk power operator (**) to the list of supported features	1
343. Add Compression Stream API	1
344. Intl.NumberFormat - notation (scientific, engineering, etc)	1
345. rel="ar" support	1
346. Add dynamic-range media query	1
347. x-webkit-airplay	1
348. What is the browser support for the newly proposed "page-orientation" property?	1
349. Add layout-instability support	1
350. Browser support for RTP streams?	1
351. Add page for relative path in HTTP Location	1
352. IPv6 support in web browsers	1
353. MediaStream Recording (	1
354. add mouse event positions event.offsetX and event.offsetY	1
355. Support setCapture and releaseCapture for mouse	1
356. background-composite	1
357. add onstorage	1
358. Feature request: Token Binding Protocol	1
359. SHA2 certificates	1
360. IETF RFCs	1
361. apple-touch-icon	1
362. Add hreflang attribute usage support for link element	1
363. event.path	1
364. Missing a check for msConvertURL() on DragEvent	1
365. Support for nested calc expressions in CSS values	1
366. Add "Named function expressions"	1
367. Open search autodiscovery	1
368. reflected-xss missing	1
369. Internationalized Domain Name	1
370. CSS Inline Layout	1
371. Add XSL to caniuse	1
372. Add support for CSS3 move-to property	1
373. Missing `StorageQuota` support	1
374. add "document.contentType"	1
375. aria-labelledby	1
376. SHA1 certificates	1
377. Add support for HTTP header X-Permitted-Cross-Domain-Policies	1
378. Add support for the HTTP header X-Download-Options	1
379. add micropub	1
380. support data suggestion: DOM event constructors ?	1
381. [Suggestion] display: fullscreen	1
382. min/max-device-width/height	1
383. Add High Resolution Time Level 3	1
384. column combination	1
385. Add WebKit Tap Highlight Color (-webkit-tap-highlight-color)?	1
386. Add css-timing	1
387. Drag and Drop API - ghost image with customizable opacity	1
388. Please add support for getTimezoneOffset()	1
389. Add Object.prototype.watch method	1
390. Add KeyboardEvent.repeat compatibility info	1
391. Add CSS4 Grid structural selectors	1
392. request support for 'accept-charset'	1
393. add CSS Extensions meant for renaming	1
394. show support for namespacing; for example <svg: namespace	1
395. window.event	1
396. Add a footnote regarding HTMLAudioElement	1
397. The xml:space attribute	1
398. Support info for the <track> element	1
399. Animating SVG paths using CSS	1
400. Drag and Drop API - move constraints	1
401. ie behavior	1
402. CaretPosition missing	1
403. Audio Output Devices API: wd	1
404. window.localMediaStream is not listed	1
405. DeviceOrientation and DeviceMotion events on insecure origins	1
406. Javascript - window.onorientationchange	1
407. audio / video .canPlayType(MIMEtype)	1
408. Add Range.getBoundingClientRect browser support table	1
409. Add support for mediacapture-output API's sinkID	1
410. document type	1
411. Add HTTP_ORIGIN feature	1
412. Add windows-theme media query selector	1
413. Add box-suppress	1
414. attachEvent event handler missing from CanIUse	1
415. Suggestion: Int64 UInt64 (Firefox only AFAIK)	1
416. string-set	1
417. Add: Task Scheduler API Specification	1
418. aria-current	1
419. date.toLocaleString support tracking plz?	1
420. Cannot find cancelBubble	1
421. Missing computed property names	1
422. [HTTP Header] Cross-Origin-Opener-Policy	1
423. Node.contains	1
424. Character-based alignment in a table column using text-align	1
425. Support for console.groupCollapsed	1
426. Add support information for SVG's getIntersectionList	1
427. user-modify	1
428. [Feature Policy: sub-feature] Sandbox features	1
429. image-resolution. I've seen this as a good alternative for retina images as opposed to backgro...	1
430. support for HTMLTableElement.createTBody	1
431. window.watchMedia()	1
432. Add compatibility for FormData	1
433. Add H2 ORIGIN frame support	1
434. Add the "frame" HTML tag : some browsers don't support it !	1
435. Add `onpagehide` support data	1
436. Add a matrix entyre for opentype-with-cff2	1
437. Suggested addition - document.baseURI	1
438. Please list support for event.eventPhase	1
439. Add checking for DataTransfer	1
440. add " -ms-overflow-style"	1
441. The hanging-punctuation property: Currently unsupported by any browser, but it would be nice to ...	1
442. VTTRegion is not found in caniuse	1
443. Support for Service Worker Life Cycle Events	1
444. Support for RegExp Named Capture Groups	1
445. Suggested addition: navigator.cpuClass	1
446. online/offline can also be used as events and are not covered by caniuse.com (only boolean property is covered)	1
447. Report Retry-After header support	1
448. Keyboard Map API	1
449. column-break-after atm only via: -webkit-column-break-after	1
450. Add: Tracking Preference Expression APIs	1
451. script tag onerror attribute	1
452. add aria-required to caniuse, if not already there	1
453. create @Media Types	1
454. CanvasRenderingContext2D.ellipse()	1
455. longdesc attribute support	1
456. Add app-region?	1
457. URLSearchParams.prototype.sort	1
458. SVG symbols in CSS	1
459. Input type=range with "multiple" attribute	1
460. Support for ImageBitmapRendereingContext	1
461. Support XMLDocument	1
462. Need full 3gp browser compatibility chart.Does it chrome browser supports 3gp format	1
463. Request: nav-up, nav-down, nav-left, nav-right css3 properties	1
464. Add "Controlling Font Display Per Font-Family via @font-feature-values"	1
465. Video media in image contexts	1
466. Please add support for supported x509 extensions for ʜᴛᴛᴘꜱ certificates	1
467. Add support for document.queryCommandState	1
468. Suggestion for caniuse.com: Which browsers.versions support multiple tbody elements in a single table?	1
469. Suggestion: support for margin-collapse?	1
470. Chained selectors	1
471. Javascript pseudoprotocol	1
472. aria-label	1
473. JS add oncuechange	1
474. [HTTP Header] Accept-CH-Lifetime	1
475. Browser support for displaying the unicode block "Combining Diacritical Marks for Symbols"	1
476. "GeometryUtils" - part of the CSSOM. Provides much better position information than existi...	1
477. Support for Unicode and spaces in URL	1
478. Add System Colors item	1
479. add for...of loops	1
480. Support data for Unicode flag on HTML pattern attribute	1
481. HTTP Content-encoding: LZFSE	1
482. Edge and IE don't support IndexedDB in web workers	1
483. add ime-mode	1
484. [DOM API] `signal` option on EventTarget.protoype.addEventListener	1