Which editor can synchronously make changes to the code of all pages of the site. Working on foagments, inserting, removing, searching for a mask?

Why would you even want to do it that way?! Instead, you use some templating engine, either an online CMS or an SSG, then change things in the template and be done.

@Fast-Nop Work will be introduced on the ancient site. I'm interested in debugging it and then move on wp

@gramatik So basically, you have an ancient horrorshow that consists of dozens of HTML files with no templating?

In that case, Notepad++ (Windows) or Notepadqq (Linux) have a "find and replace in files" option, or you could try CLI tools like grep and sed.

Pretty much any decent text editor?

@electrineer I think there should be a pro-project environment that has tools for editing a site (consisting of many pages) as one

@gramatik if you have any structure in the repo, you can just open a specific folder or limit the search to the folders you want

@electrineer no repo(