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In https://classic.tiddlywiki.com/#[[TiddlyWiki Browser Compatibility]], mention that the opera:config#UserPrefs|AllowFileXMLHttpRequest option is actually for Opera 12.x and below, while --allow-file-access-from-files is not only for Chrome but probably also for all Chromium-based browsers (confirmed here for Vivaldi, new Opera, Opera Neon; to be tested with Chromium itself).