View Indexframe Shtml

Instead of <frame src="navigation.shtml">, use a CSS layout:

<div class="container">
  <div class="sidebar"><!--#include virtual="nav.shtml" --></div>
  <div class="main-content"><!--#include virtual="dynamic_content.shtml" --></div>
</div>

"Indexframe" is a compound term. In classic web architecture: view indexframe shtml

An indexframe likely refers to a frameset definition file (often named indexframe.html or index.shtml) that lays out how other pages should be displayed within a frame structure. In the 1990s and early 2000s, portals and admin panels used frames extensively to keep a navigation pane static while changing the content pane. Instead of <frame src="navigation

The term "View Index Frame" might refer to a structured approach to organizing web pages, particularly in the context of using frames or iframes to display content. Frames allow you to divide a browser window into multiple sections, each of which can display a different HTML document. While the use of frames has declined with the advent of more flexible and powerful web development techniques, understanding how to work with frames or similar constructs is still valuable, especially when integrating with server-side technologies. "Indexframe" is a compound term

If the page loads but areas are blank, an  directive points to a file path that no longer exists.

If SSI is enabled but not secured, or if the .shtml file contains comments or misconfigured directives, it can leak server path information, environment variables, or internal IP addresses.

PHP is universally supported and more secure:

<?php
  $page = $_GET['view'] ?? 'indexframe.php';
  $allowed = ['indexframe.php', 'about.php'];
  if (in_array($page, $allowed)) 
    include($page);
?>