StyleSheetLoader 会为不再存在于文档中的样式表保留缓存的"已加载"状态,从而使后续编辑器无法显示。

1. The container is hidden inline and revealed only by the skin. From modules/tinymce/src/themes/silver/main/ts/Render.ts:

styles: {
  // This is overridden by the skin, it helps avoid FOUC
  visibility: 'hidden',

and the override, identical in oxide and oxide-dark:

.tox-tinymce{
…