Merge pull request #9167 from bonartm/fix_css_specific_page

html: fix missing reverting when adding css files to specific page

Author: tk0miya

sphinx/builders/html/__init__.py

@@ -1026,7 +1026,7 @@ def hasdoc(name: str) -> bool:
 
         # revert script_files and css_files
         self.script_files[:] = self._script_files
-        self.css_files[:] = self.css_files
+        self.css_files[:] = self._css_files
 
         self.update_page_context(pagename, templatename, ctx, event_arg)
         newtmpl = self.app.emit_firstresult('html-page-context', pagename,