Every landing page focuses on one critical issue: what it is, why it matters, and the fastest way to fix it with Checker.
Detects images without alt attributes on the page.
Finds images that has an alt attribute, but that is empty.
Detects broken pages (4xx or 5xx status codes).
Detects pages missing a title tag or having an empty title.
Detects pages missing a canonical tag.
Detects canonical tags that use a relative URL.
Detects pages with a noindex meta tag, preventing them from being indexed.
Detects pages with a none meta tag (equivalent to noindex, nofollow).
Detects pages missing an Open Graph title tag (og:title).
Detects pages missing an Open Graph image tag (og:image).
Detects Open Graph URL tags that use a relative URL.
Detects pages missing a Twitter title meta tag (twitter:title).
Detects pages missing a Twitter image meta tag (twitter:image).
Detects JSON-LD script tags containing invalid JSON.
Detects JSON-LD structured data missing the "@context": "https://schema.org" property.
Detects JSON-LD structured data missing the "@type" property.
Detects hreflang attributes with invalid language code format.
Detects hreflang tags missing the href attribute.
The <html> tag is missing the lang attribute, which is important for accessibility and SEO.
The <html> tag has a lang attribute, but it is empty.
The page does not have a <main> element or an element with role="main".
Detects input elements that do not have an accessible label.
Detects textarea elements that do not have an accessible label.
Detects select elements that do not have an accessible label.
Detects button elements that have no text content or accessible name.
Detects link (a) elements that have no text content or accessible name.
Detects iframe elements that are missing a title attribute.
Detects object elements that do not have a text alternative.
Detects focusable elements that are hidden from screen readers using aria-hidden="true".
Detects elements with role="presentation" or role="none" that are focusable.
Detects elements with role="img" that do not have an accessible label.
Detects elements with role="dialog" or "alertdialog" that do not have an accessible label.
Detects elements with role="cell" or "gridcell" that are not contained within a role="row".
Detects elements with role="row" that are not contained within a role="grid", "treegrid", or "table".
Detects video elements that are missing a track element (captions/subtitles).
Detects audio elements that are missing a track element (transcript/captions).
Detects video elements with autoplay enabled but missing the controls attribute.
Detects input elements with type='image' that are missing an alt attribute or have an empty alt attribute.