The close icon as defined by the [[ https://wikimedia.github.io/WikimediaUI-Style-Guide/visual-style_icons.html | WikimediaUI icon principles ]]. OOUI is already featuring the correct icon.

| | Product | Description | Code | Screenshot | Screenshot after
| | -- | -- | -- | -- | --
| {icon check color=green} | OOUI | [[ https://doc.wikimedia.org/oojs-ui/master/demos/?page=icons&theme=wikimediaui&direction=ltr&platform=desktop#widgets-mediawiki-vector-ltr | Uses the correct icon ]] |  | {F9379666} | 
| {icon check color=green} | Post-Edit Feedback popup | Uses the Unicode × glyph with hover behavior | Extension:PostEdit outputs CSS generated content `×` with style rules. | {F7451633} | {F26525706} 
| {icon check color=green} | Recent CentralNotice banners | "x in a circle" icon, no `:hover` behavior | Extension:CentralNotice outputs an img tag showing :$wgNoticeCloseButton which defaults to [[https://upload.wikimedia.org/wikipedia/foundation/2/20/CloseWindow19x19.png|CloseWindow19x19.png]] | {F26525761} | 
| - | ~~Visual Editor Feedback dialog~~ | As of 2017-09 not an issue any more => converted to OOUI | | {F9404470} | 
| {icon check color=green} | ULS | ~~Thicker stroke “x” SVG, no :hover behavior~~ | Extension:UniversalLanguageSelector custom `.uls-icon-close` class | {F9362244} | {F9404483}
| {icon check color=green} | Extension:GuidedTour | different icon with different size |  `.guider_close` |  | 
| {icon exclamation-triangle color=red} | Extension:MultimediaViewer | bolder, less contrast; Exempt from amending is the main close icon as it would need a full icon redesign. Will be revisited after T177432 |  | {F10595012} | 
| {icon check color=green} | Extension:GettingStarted | different icon with different size and lighter grey |  `.mw-gettingstarted-cta-close` | {F10172642} | {F10188673}
| {icon check color=green} | Extension:PagePreviews | different icon, bolder and bigger | | {F10318266} | {F10319955}
| {icon check color=green} | Extension:Translate | ~~Similar to ULS, different icon though, as it's minimally smaller in layout~~ | `.grid .tux-message-editor .close` | {F9405760} | 


The differences make WMF wikis feel unpolished.

--------------------------
Original report: 
**Version**: 1.22.0