Image alt attribute exists but emptyImage has no alt attributeImage has no width and height attribute
<link rel="canonical"> not foundCanonical tag <link rel="canonical"> URL is not absoluteMultiple Canonical Tags <link rel="canonical"> found on pageCanonical tag found outside the <head> sectionCanonical tag <link rel="canonical"> found on page points to a different pageCanonical tag <link rel="canonical"> link is malformedCanonical on Http Page Points to a https pageCanonical on Https Page Points to a http pageCanonicalized URL is noindex, nofollowCanonical tag <link rel="canonical" contains empty urlCanonical LoopCanonical points to a URL that is Error (5XX)Canonical points to a url that is no indexCanonical points to a URL that is Not Found 404Canonical points to a redirecting URLCanonical points to another canonicalized URLCanonical points to a disallowed URLCanonical URL Blocked By Robots meta TagCanonical Url Blocked by X-Robots Header
Heading tag <h2> not foundHeading 1 tag <h1> not foundMore than one Heading 1 tag <H1> found<h1> to <h6> chain broken.Heading tag <h1> emptyHeading tag <h2> empty<h1> tag found outside <body><h2> tag found outside <body>Duplicate H1
Hreflang with duplicate language/region combinationsHreflang with multiple defaultsInvalid region in the hreflang attributeInvalid language in the hreflang attributeMissing Language entryUnderscore Instead of DashInvalid order of hreflang valuesNo self-referencing hreflang tagHreflang Using Relative linksEmpty Hreflang URLHreflang Present Outside <head>Hreflang url is invalidConflicting hreflang and rel=canonicalX-Default MissingHreflang link points to redirected pageBroken Hreflang LinksReturn Tag ErrorsHreflang Url Not IndexableHreflang Url Disallowed By Robots.txtHreflang Url Blocked By Robots meta TagHreflang Url Blocked by X-Robots Header
Two different <base> directives found on pageMore than one <base> tag found<base> is found on page and is same as page (that is page URL)Base tag points to different pageBase tag <base> contains malformed or empty URLHyperlink (<a href>) has both href and onclick attributeHyperlink(s) (<a href>) are using relative referenceNo internal links foundMore than 100 hyperlinks found
Meta Robots <meta name="robots"> specified more than onceMeta Robot tag <meta name="robots"> content contains no followMeta Robot tag <meta name="robots"> content contains no indexMeta description tag <meta name="description"> missingMeta description tag <meta name="description"> too longMeta description tag <meta name="description"> occurs more than onceMeta keyword tag <meta name="keyword"> foundMeta tag found outside the <head> sectionMeta Refresh tag <meta http-equiv="refresh"> foundMeta description tag <meta name="description"> emptyMeta Description same as <h1 >Duplicate Meta Descriptions
Title tag <title> missingTitle is less than 10 charactersTitle is longer than 60 charactersTitle tag <title> occurs more than onceTitle tag <title> found outside the <head> sectionTitle and Meta Descriptions are the sameTitle tag <title> emptyTitle is a single word<title> same as <h1>Duplicate Title
URL has // in pathURL has queryURL has 3 or more query parametersURL has repetitive parameters in queryURL has more than 115 charactersURL has non-lowercase elements in pathURL has non-ascii elements in path
Missing <meta Viewport> tagMultiple viewport <meta> tags were found in the <head>Viewport <meta> tag does not have a width setviewport <meta> tag has a specific width setviewport <meta> tag is missing the initial-scale attributeviewport <meta> tag is missing the width attributeviewport <meta> exists outside the headviewport <meta> has a maximum-scale setviewport <meta> has a minimum-scale set