Medium impact · weight 5 · worth up to 1.6 points of the total score
The lang attribute tells screen readers which pronunciation rules to use and helps search engines serve the page to the right audience. Without it a screen reader may read English text with the wrong phonetics.
Set the language on the root element, for example <html lang="en">.
Check a page for this, and the other 41 checks at once
Meta description length is in range
Descriptions shorter than about 120 characters leave the snippet half empty; past about 160 the end is cut off mid-sentence.
Heading levels are not skipped
Screen readers and crawlers read headings as an outline. Jumping from H2 straight to H4 implies a missing level, so the outline reports a section that does not exist.
Page links to the rest of the site
Internal links are how crawlers reach the rest of the site and how ranking signal flows between pages. A page with none is a dead end that hoards whatever authority it earns.
Structured data parses as JSON
A JSON-LD block with a trailing comma or an unescaped quote is discarded whole. The rich result it was meant to earn silently never appears, and nothing in the page looks broken.
