Despite the HTML 4.01 Strict DOCTYPE declaration, the W3C validator reports that this document is "HTML 4.01 Transitional":
'The uploaded file was checked and found to be valid HTML 4.01 Transitional. This means that the resource in question identified itself as "HTML 4.01 Transitional" and that we successfully performed a formal validation using an SGML or XML Parser (depending on the markup language used).'
I have tried different source spacing—lots of line breaks or none at all; a single line for the DOCTYPE declaration or multiple lines—but always with the same results.