V6 — Language and reading level
Paragraph claiming German (no lang attribute):
Guten Tag. Heute spreche ich über die unermessliche Komplexität der barrierefreien Webgestaltung und ihre Auswirkungen auf vielfältige Benutzergruppen weltweit.
Paragraph claiming Japanese (no lang attribute):
こんにちは、これは日本語のテストです。アクセシビリティについて考えましょう。
Inline code-switch French inside English (no lang span):
This sentence has a French phrase, “je ne sais quoi”, inside without any lang attribute.
High-Flesch-difficulty paragraph (long polysyllabic words, complex syntax):
Notwithstanding the multifaceted, interdisciplinary considerations attendant upon the operationalisation of accessibility-oriented heuristics within heterogeneous, organisationally-distributed engineering teams, the demonstrable, empirically-substantiated efficacy of remediative interventions remains contingent upon the contextually-sensitive interpretive practices of practitioner-stakeholders engaged in iterative, reflexive sense-making procedures.
Spanish paragraph mis-tagged as English:
Hola, ¿cómo está usted? Este párrafo está en español pero declarado como inglés.
Empty lang attribute:
Some text in undeclared language.
Invalid lang code:
Made-up language code.
Paragraph with abbreviations and no <abbr> expansion:
The WCAG ARIA WAI-ARIA W3C ATAG specifications govern UX/UI a11y.
Direction conflict (RTL text without dir=rtl):
שלום עולם — Hebrew text without direction attribute.