I can still reproduce this bug on [the second one](https://www.zhihu.com/question/597728323) after shrinking the browser window until `<html>` width is around 800px.
Bug 1895051 Comment 12 Edit History
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I can still reproduce this bug on [the second one](https://www.zhihu.com/question/597728323) after shrinking the browser window until `<html>` width is around 800px. I need to refresh the page to make the `目录` button appear.