lang attribute on the
lang attribute will only be populated with a value that's BCP 47 compliant
This rule aims to ensure HTML content is WCAG 3.1.1 compliant.
Examples of incorrect code for this rule:
html` <html></html> `;
html` <html lang="not-a-real-language"></html> `;
Examples of correct code for this rule:
html` <html lang="en"></html> `;