Your page doesn't declare what language it's written in. Screen readers may mispronounce your content, and search engines may have trouble categorizing your site correctly.
On WordPress
WordPress sets the html lang attribute automatically based on your site language (Settings → General → Site Language). If the attribute is missing, your theme may have a custom html template overriding WordPress's output.
On Shopify
Shopify's themes include lang="{{ request.locale.iso_code }}" on the html tag automatically. If missing, edit the theme.liquid file and add lang="{{ shop.locale }}" to the <html> opening tag.
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