I successfully installed ckeditor within a symfony project and also activated the markdown plugin by:
$builder->add('content', CKEditorType::class, array(
'config' => array(
'extraPlugins' => 'markdown',
),
'plugins' => array(
'wordcount' => array(
'path' => '/bundles/ivoryckeditor/plugins/markdown/',
'filename' => 'plugin.js',
),
),
));
It works so far, the markdown button appears in the textarea panel. But when I click the button, button and textfield become grey and I get this error in console:
InvalidCharacterError: String contains an invalid character (line 74)
edit: I again also tried to create a ckeditor with markdown plugin using the builder on ckeditor.com and replaced the public folder of the bundle with the downloaded editor, but still the markdown button throws the same error