The error
Uncaught Error: Syntax error, unrecognized expression: . at Function.Sizzle.error (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:21) at Sizzle.tokenize (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:30) at Sizzle.select (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:37) at Function.Sizzle (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:11) at Function.jQuery.find (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:146) at jQuery.fn.init.find (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:41) at jQuery.fn.init (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:42) at new jQuery.fn.init (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:145) at jQuery (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:2) at Object.mw.cx.TranslationTracker.static.getTokensFromValidationTree (<anonymous>:206:297) load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:21 Uncaught Error: Syntax error, unrecognized expression: . at Function.Sizzle.error (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:21) at Sizzle.tokenize (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:30) at Sizzle.select (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:37) at Function.Sizzle (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:11) at Function.jQuery.find (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:146) at jQuery.fn.init.find (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:41) at jQuery.fn.init (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:42) at new jQuery.fn.init (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:145) at jQuery (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:2) at Object.mw.cx.TranslationTracker.static.getTokensFromValidationTree (<anonymous>:206:297) VM150:1031 Uncaught Error: Syntax error, unrecognized expression: . at Function.Sizzle.error (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:21) at Sizzle.tokenize (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:30) at Sizzle.select (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:37) at Function.Sizzle (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:11) at Function.jQuery.find (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:146) at jQuery.fn.init.find (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:41) at jQuery.fn.init (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:42) at new jQuery.fn.init (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:145) at jQuery (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:2) at Object.mw.cx.TranslationTracker.static.getTokensFromValidationTree (<anonymous>:206:297) DevTools failed to load SourceMap: Could not load content for chrome-extension://hdokiejnpimakedhajhdlcegeplioahd/sourcemaps/onloadwff.js.map: HTTP error: status code 404, net::ERR_UNKNOWN_URL_SCHEME load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:21 Uncaught Error: Syntax error, unrecognized expression: . at Function.Sizzle.error (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:21) at Sizzle.tokenize (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:30) at Sizzle.select (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:37) at Function.Sizzle (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:11) at Function.jQuery.find (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:146) at jQuery.fn.init.find (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:41) at jQuery.fn.init (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:42) at new jQuery.fn.init (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:145) at jQuery (load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:2) at Object.mw.cx.TranslationTracker.static.getTokensFromValidationTree (<anonymous>:206:297) Sizzle.error @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:21 Sizzle.tokenize @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:30 Sizzle.select @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:37 Sizzle @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:11 jQuery.find @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:146 find @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:41 jQuery.fn.init @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:42 jQuery.fn.init @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:145 jQuery @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:2 mw.cx.TranslationTracker.static.getTokensFromValidationTree @ VM150:206 mw.cx.TranslationTracker.static.getSectionNodeValidationTokens @ VM150:206 mw.cx.TranslationTracker.validateForMTAbuse @ VM150:212 mw.cx.TranslationTracker.processValidationQueue @ VM150:216 later @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:157 setTimeout (async) (anonymous) @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:157 mw.cx.TranslationTracker.processSectionChange @ VM150:211 mw.cx.TranslationTracker.processChangeQueue @ VM150:210 mw.cx.TranslationController.processChangeQueue @ VM150:189 mw.cx.TranslationController.processSaveQueue @ VM150:189 later @ load.php?lang=pt&modules=jquery%2Coojs-ui-core%2Coojs-ui-widgets&skin=vector&version=b943y:157
happened at
https://pt.wikipedia.org/wiki/Special:ContentTranslation?title=Special:ContentTranslation&campaign=contributionsmenu&to=pt&page=Universal+algebra&from=en&targettitle=%C3%81lgebra+universal
right after I clicked on the paragraph
For example, the n-coloring problem can be stated as CSP of the algebra {\displaystyle {\big (}\{0,1,\dots ,n-1\},\neq {\big )}}, i.e. an algebra with {\displaystyle n} elements and a single relation, inequality.
to start translating it.