This happens because the SSI directives (like <!--#include virtual="..." --> ) are not standard HTML. A web browser doesn't know how to interpret them. When a web server encounters an SSI directive, it replaces it with the content of the included file before sending the page to the browser. When the file is opened directly from a hard drive, there is no server to perform this preprocessing.
Update device firmware regularly to patch vulnerabilities within the internal web server software. view indexframe shtml portable
In this article, we demonstrated how to create a portable view index frame using HTML, CSS, and JavaScript. By wrapping the code in a single HTML file using the <template> element, we made the view index frame self-contained and easy to integrate into different web pages. This approach can save development time and effort, making it a valuable asset for web developers. This happens because the SSI directives (like <