problema di validazione: codice e tag <noscript>

Non capisco il senso di questo problema di validazione:

Error Line 67 column 18: document type does not allow element "span" here; missing one of "p", "h1", "h2", "h3", "h4", "h5", "h6", "div", "pre", "address", "fieldset", "ins", "del" start-tag. <noscript><span> The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.

One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").

In pratica il problema di verifica nella riga in cui scrivo

<noscript> <span>
adsfasdfasdf
</span></noscript>

il problema NON si verifica se scrivo:
<noscript> <p>
adsfasdfasdf
</p></noscript>

perche non mi fa mettere <span>?

perchè a quanto pare il tag <noscript> non accetta al suo interno tag 'inlinea' (come <span> <a> ecc) ma solo tag 'blocco' (come <div> <p> ecc)