When using Favic-o-Matic to generate favicons, I want to understand the specifics of the HTML code provided. Explain why the generated HTML uses absolute paths for favicon links. Additionally, confirm if it's possible to include arbitrary code, such as PHP, within the generated HTML for my website's favicon implementation.
Navigate to favicomatic.com. Click on the 'advanced settings' link. Locate the 'website URL' input field and click the associated information icon (id: 214) next to it. Identify and extract the explanation regarding the use of absolute paths in the generated HTML code. Identify and extract the confirmation regarding the use of arbitrary code in the generated HTML.
State that the generated HTML code uses absolute paths because some Firefox versions require them, and all browsers support them, making it the simplest choice. Confirm that arbitrary code can also be used, providing the example given on the site (e.g., `<?php echo $_SERVER['SERVER_NAME']; ?>`).