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Before PHP and ASP became ubiquitous, developers used to reuse components like headers, footers, and navigation menus. Files with the .shtml extension tell the web server (typically Apache or Nginx) to parse the file for SSI directives before sending it to the browser.

: The .shtml extension indicates "Server Side Includes," a method used to create dynamic web pages by inserting the contents of one file into another—common in older or specialized web tools for managing story archives. How to Use Story Links view indexframe shtml link

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