What did you do? ================ 1. I edited the document 2. previewed my changes and saw no problems 3. saved the document What happened? ============== The page displayed an error and the API sidebar was missing. What should have happened? ========================== No error and the API sidebar should show up. Is there anything else we should know? ====================================== I couldn't fix the error by reverting to the last version. The error can still be seen on https://developer.mozilla.org/de/docs/Web/API/Window/setTimeout
The page was in the wrong location. I moved it https://developer.mozilla.org/de/docs/Web/API/WindowTimers/setTimeout Still investigating why that caused an error to throw, but the page itself works again. Thanks for your report.