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hardHTMLthe preload scannerSingle-choice MCQ

A browser's preload scanner runs as a secondary, lightweight tokenizer over the raw byte stream while the main HTML parser is blocked. Given this script that injects a stylesheet at runtime, why does the preload scanner fail to discover and fetch styles.css early?

<head> <script> const l = document.createElement('link'); l.rel = 'stylesheet'; l.href = 'styles.css'; document.head.appendChild(l); </script> </head>