High impact · weight 8 · worth up to 2.6 points of the total score
An https page that pulls scripts, styles, or images over http has those requests blocked or downgraded by the browser. Layout and behaviour break with no server-side error to show for it.
Serve every subresource over https, or let the asset pipeline emit protocol-relative paths.
Check a page for this, and the other 41 checks at once
robots.txt lets Google crawl the page
A Disallow rule in robots.txt stops Googlebot from fetching the page at all, so everything else on this report stops mattering: the page can only appear in results as a bare URL with no description, or not at all.
Page has exactly one H1
The H1 states what the page is about. Zero leaves the topic unstated; several compete with each other and make the page read as a list of unrelated sections.
Page declares a canonical URL
Without a canonical, every URL variant that reaches this page (tracking parameters, trailing slash, uppercase path) can be indexed as a separate page, splitting the ranking signal between duplicates.
Images have alt text
Alt text is how a screen reader describes an image and how a search engine understands it. Missing alt attributes are an accessibility defect and lost image-search traffic at the same time.
