After I vandalised the test page with[1], trying to edit this page resulted in "renderers[annotation.type] is undefined"
var openAnnotations = function( annotations ) {
var out = '',
annotation;
for ( var hash in annotations ) {
annotation = annotations[hash];
out += typeof renderers[annotation.type].open === 'function' ? <-- here
renderers[annotation.type].open( annotation.data ) :
renderers[annotation.type].open;
hashStack.push( hash );
annotationStack[hash] = annotation;
}[1] https://www.mediawiki.org/w/index.php?title=VisualEditor:Test&diff=552553&oldid=552537
Version: unspecified
Severity: normal