Add the lang attribute to your html tag

The lang attribute on your HTML tag explicitly declares your page's primary language to both browsers and search engines, supporting several genuine, practical functions including proper screen reader pronunciation, appropriate browser translation prompting, and search engine language-based content categorization.

Without this explicit declaration, browsers and assistive technologies must attempt to infer your content's language through other means, which can produce incorrect results particularly for content that includes technical terms, proper nouns, or other elements that might confuse automatic language detection — explicit declaration removes this ambiguity entirely.

This becomes particularly important for accessibility specifically — screen readers use this declaration to select the appropriate pronunciation rules and voice for reading your content aloud, and an incorrect or missing declaration can result in genuinely confusing or incorrect pronunciation that meaningfully degrades the experience for visitors relying on this assistive technology.

For sites with multiple language versions, this attribute should accurately reflect each specific page's actual language, working in conjunction with the hreflang implementation discussed elsewhere in this broader technical SEO work to provide search engines with complete, accurate signal about your content's language and regional targeting.