What alternatives exist for including HTML files within other HTML files, especially when PHP is not an option?

When PHP is not an option, one alternative for including HTML files within other HTML files is to use JavaScript to fetch and insert the content dynamically. This can be achieved by using the Fetch API or XMLHttpRequest to make a request to the server for the HTML file and then inserting the content into the DOM using innerHTML or appendChild. ```javascript // Fetch HTML file using Fetch API fetch('path/to/file.html') .then(response => response.text()) .then(data => { document.getElementById('container').innerHTML = data; }) .catch(error => console.error('Error fetching HTML file:', error)); ```