Low impact · weight 4 · worth up to 0.8 points of the total score
The same page reachable at http and https, or with and without www, is several copies of the site as far as search engines are concerned. They pick one, split links and signals between the copies, and sometimes pick the wrong one. The other addresses should redirect permanently to the one you use.
Redirect http to https and the www or bare variant to your preferred host with a 301, in the server or CDN. Most hosts have a single switch for each.
Check a page for this, and the other 70 checks at once
Content is in the HTML, not only in JavaScript
GPTBot, ClaudeBot and PerplexityBot download a page's JavaScript but do not run it, so a page that builds its text in the browser is blank to them. Google does run JavaScript, but later and not always. This counts the words in the HTML as it arrives, before any script runs.
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.
