Content-type: text/html
\n\n
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>

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places 4 newlines bewteen "html" and "<!DOCTYPE", which means "<!DOCTYPE" is on the third line of the body but I think the specs requires it to be on the first line. Just leave a blank line between "html" and "<!DOCTYPE".

In reply to Re^3: I think I'm misunderstanding $| by ikegami
in thread I think I'm misunderstanding $| by sigmazero13

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