Does anyone know why when you add a Facebook feed to your website, in Firefox the closing head and opening body tags show up in red? Is there a way to combat this as W3 schools reckons that the website is not up to standard. Example click here
Thanks
The problem is that your div is inside the head element. <div id="fb-root"></div> and the following code needs to appear somewhere after the <body> tag.
What's currently happening is your browser sees the <div> tag which can not appear inside <head>, so it implicitly closes the head and opens the body. Then, when your </head> tag appears, the browser rightfully complains about a duplicate closing tag.
To fix it, you need to put that code inside the <body> where it belongs.