sk Skill · thedaviddias
html-xml-lang-mismatch
Use when applies to XHTML documents and polyglot HTML documents that must parse correctly as both HTML5 and XML. For modern HTML5-only documents, only lang is needed and xml:lang is not required. Check when auditing documents served as application/xhtml+xml or documents that include both attributes.
Open on skills.sh ↗read 2026-09-15
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