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(from) LinkTargetPageStatusError
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10000-broken-link
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Missing Resources
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A page with a link whose href attribute points to a missing page
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LinkTargetIdMissing
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10001-broken-anchor-same-page
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Missing Resources
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A page with a link whose href attribute points to a missing anchor on the same page
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10002-broken-image
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Missing Resources
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An image whose src= attribute points to a missing image path
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10003-broken-stylesheet
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Missing Resources
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A page that imports a stylesheet that doesn't exist
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10004-broken-script
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Missing Resources
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A page that imports a script that doesn't exist
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10005-broken-favicon
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Missing Resources
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A page that imports a favicon that doesn't exist
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10006-broken-rss-feed
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Missing Resources
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A page that defines an RSS feed that doesn't exist
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LinkTargetIdMissing
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10007-broken-anchor-different-page
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Missing Resources
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A page with a link whose href attribute points to a missing anchor on a different page
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10008-link-missing-trailing-slash
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Missing Resources
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link to a page in a directory that doesn't include the trailing slash
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10009-invalid-link
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Missing Resources
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A page with a link that is completely invalid
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10010-broken-canonical-link
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Missing Resources
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A page with a broken canonical URL
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LinkToRedirect
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20000-permanent-redirect
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Redirects
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A page that responds with a redirect to another page with status code 301
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LinkToRedirect
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20001-temporary-redirect
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Redirects
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A page that responds with a redirect to another page with status code 302
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UnresolvedRedirect
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LinkToRedirect
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20002-infinite-redirect
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Redirects
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A page that infinitely redirects
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LinkTargetPageMissing
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20003-infinite-filters
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Redirects
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A page that has never-repeating filter links
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LinkToRedirect(40004) LinkTargetPageStatusError(404)
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20004-redirect-to-error
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Redirects
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A page that responds with a redirect to another page with status code 404
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UnresolvedRedirect
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LinkToRedirect
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20005-redirect-loop
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Redirects
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A page that redirects to itself, causing a redirect loop
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30000-insecure-link
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Security
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A link with the target="_blank" attribute but with no rel="noopener" attribute
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30001-mixed-resources
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Security
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A page served over https:// that loads resources served over http://
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LinkTargetPageStatusError(400)
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40000-bad-request
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HTTP Errors
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A page that responds with 400 status code
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LinkTargetPageStatusError(401)
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40001-unauthorized
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HTTP Errors
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A page that responds with 401 status code
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LinkTargetPageStatusError(403)
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40002-forbidden
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HTTP Errors
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A page that responds with 403 status code
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LinkTargetPageStatusError(500)
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40003-internal-server-error
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HTTP Errors
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A page that responds with 500 status code
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LinkTargetPageStatusError(404)
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40004-not-found
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HTTP Errors
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A page that responds with 404 status code
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LinkTargetPageStatusError(503)
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40005-service-unavailable
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HTTP Errors
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A page that responds with 503 status code
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LinkTargetPageStatusError(504)
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40006-gateway-timeout
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HTTP Errors
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A page that responds with 504 status code
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50000-page-load-1-second
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Performance
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A page that takes 1 second to load
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50001-page-load-2-seconds
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Performance
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A page that takes 2 seconds to load
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50002-page-load-3-seconds
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Performance
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A page that takes 3 seconds to load
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50003-page-load-5-seconds
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Performance
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A page that takes 5 seconds to load
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50004-page-load-10-seconds
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Performance
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A page that takes 10 seconds to load
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50005-image-load-3-seconds
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Performance
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A page with an image that takes 3 seconds to load
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60000-missing-title
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SEO
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A page with no title
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60001-missing-description
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SEO
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A page with no description
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60002-missing-viewport
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SEO
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A page with no viewport
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60003-missing-charset
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SEO
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A page with no charset
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60004-missing-doctype
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SEO
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A page with no DOCTYPE
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60005-long-title
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SEO
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A page with a very long title.
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60006-long-description
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SEO
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A page with an excessively long description.
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60007-not-in-sitemap
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SEO
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A page that doesn't appear in sitemap.xml
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60008-blocked-by-robots-wildcard
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SEO
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A page blocked by a robots.txt wildcard rule
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60009-blocked-by-robots-useragent
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SEO
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A page blocked by a robots.txt user agent rule
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DuplicatedId
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70000-duplicate-element-ids
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Accessibility
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A page with elements with duplicate id= attributes
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70001-missing-html-lang
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Accessibility
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A page whose html element has no lang= attribute
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70002-improper-headings
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Accessibility
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A page with incorrect use of heading elements
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70003-missing-image-alt-attribute
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Accessibility
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A page with an image with no alt= attribute
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70004-form-with-unconnected-labels
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Accessibility
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A page with a form with unconnected labels
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70005-table-with-no-header-row
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Accessibility
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A page with a table with no header row
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