Does W3C no longer support polyglot layout?

Question

W3C has stopped supporting polyglot layout. So should I convert my site to use regular HTML5 instead of XHTML? How will they abandon this concept on existing sites? I want to have valid markup, and if this code conflicts with what is standard, I will have to remove it.

Answer 1

As usual, more errors in XHTML comments without any true understanding of what it is.

• XHTML uses an XML parser.
• HTML uses an HTML parser.

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<?php
if (stristr($_SERVER['HTTP_ACCEPT'],'application/xhtml+xml'))
{
 header('Content-Type: application/xhtml+xml');
 echo '<?xml version="1.0" encoding="UTF-8"?>'."\n";
}
?>

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