2.2.55 [HTML] Section 18.3.1, The NOSCRIPT element
V0125:
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The content of a NOSCRIPT element should only be rendered by a script-aware user agent in the following cases: The user agent is configured not to evaluate scripts. The user agent doesn't support a scripting language invoked by a SCRIPT element earlier in the document.
All Document Modes (All Versions)
If a language invoked by a SCRIPT element earlier in the document is not supported, the NOSCRIPT content will not appear.