- Open VE on https://www.mediawiki.org/wiki/Manual:FAQ?veaction=edit
- JS error
Uncaught TypeError: Cannot read property 'extsrc' of null at VeCeMWAlienInlineExtensionNode.ve.ce.MWExtensionNode.generateContents (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:4), <anonymous>:269:244) at VeCeMWAlienInlineExtensionNode.ve.ce.GeneratedContentNode.forceUpdate (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:477) at VeCeMWAlienInlineExtensionNode.ve.ce.GeneratedContentNode.update (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:477) at VeCeMWAlienInlineExtensionNode.VeCeGeneratedContentNode (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:475) at VeCeMWAlienInlineExtensionNode.VeCeMWExtensionNode (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:4), <anonymous>:268:783) at VeCeMWAlienInlineExtensionNode.VeCeMWInlineExtensionNode (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:4), <anonymous>:270:897) at new VeCeMWAlienInlineExtensionNode (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:4), <anonymous>:328:283) at VeCeNodeFactory.oo.Factory.create (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:4), <anonymous>:169:554) at VeCeParagraphNode.ve.ce.BranchNode.onSplice (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:341) at VeCeParagraphNode.ve.ce.ContentBranchNode.onSplice (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:346) at VeCeParagraphNode.VeCeBranchNode (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:339) at VeCeParagraphNode.VeCeContentBranchNode (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:345) at new VeCeParagraphNode (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:490) at VeCeNodeFactory.oo.Factory.create (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:4), <anonymous>:169:554) at VeCeDocumentNode.ve.ce.BranchNode.onSplice (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:341) at VeCeDocumentNode.VeCeBranchNode (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:339) at new VeCeDocumentNode (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:486) at new VeCeDocument (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:329) at new VeCeSurface (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:378) at VeUiSurface.ve.ui.Surface.createView (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:526) at new VeUiSurface (load.php?debug=false&lang=en&modules=ext.visualEditor.core|oojs-ui-core%2Coojs-ui-widgets|oojs-ui.s…:523) at VeInitMwDesktopArticleTarget.ve.init.Target.createSurface (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:4), <anonymous>:147:31) at VeInitMwDesktopArticleTarget.ve.init.mw.Target.createSurface (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:4), <anonymous>:163:227) at VeInitMwDesktopArticleTarget.ve.init.mw.ArticleTarget.createSurface (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:4), <anonymous>:596:891) at VeInitMwDesktopArticleTarget.ve.init.Target.addSurface (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:4), <anonymous>:147:696) at eval (eval at <anonymous> (load.php?debug=false&lang=en&modules=jquery%2Cmediawiki|mediawiki.legacy.wikibits&only=scripts&skin…:4), <anonymous>:164:651)
The problem seems to be because Parsoid outputs
<span typeof="mw:Extension/languages" about="#mwt258" data-mw="{"name":"languages","attrs":{},"body":null}" id="mwAg"> </span>
for the wikitext <languages /> at the top of the page. It appears that .body being null in the JSON blob causes this crash, because the code in ve.ce.MWExtensionNode#generateContents expects mwData.body.extsrc to exist. So maybe this is a Parsoid bug, but at the same time VE should probably be more resilient against this kind of thing.