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All ACE Rule IDs (103)
All ACE Rule IDs (103)
ace-img-area-alt
ace-aria-allowed-attr
ace-aria-braille-equiv
ace-aria-command-name
ace-aria-cond-attr
ace-aria-deprecated-role
ace-aria-hidden-body
ace-aria-hidden-focus
ace-aria-input-name
ace-aria-meter-name
ace-aria-progressbar-name
ace-aria-prohibited-attr
ace-aria-required-attr
ace-aria-required-children
ace-aria-required-parent
ace-aria-valid-roles
ace-aria-toggle-name
ace-aria-tooltip-name
ace-aria-valid-value
ace-aria-valid-attr
ace-text-no-blink
ace-form-button-name
ace-nav-bypass-block
ace-text-contrast-aa
ace-struct-def-list
ace-struct-dl-item
ace-meta-doc-title
ace-aria-unique-id
ace-form-multi-label
ace-nav-frame-focusable
ace-struct-frame-unique-title
ace-struct-frame-title
ace-meta-lang-present
ace-meta-lang-valid
ace-meta-lang-mismatch
ace-img-alt-text
ace-form-input-button-name
ace-form-input-image-alt
ace-form-label
ace-text-link-distinguish
ace-nav-link-name
ace-struct-list-valid
ace-struct-listitem-parent
ace-text-no-marquee
ace-meta-no-refresh
ace-meta-viewport-scale
ace-nav-no-nested-interactive
ace-media-no-autoplay
ace-media-object-alt
ace-img-role-alt
ace-nav-scroll-focusable
ace-form-select-name
ace-img-no-server-map
ace-img-svg-alt
ace-table-td-headers
ace-table-th-data-cells
ace-meta-valid-lang
ace-media-video-caption
ace-form-autocomplete-valid
ace-text-no-inline-spacing
ace-nav-target-size
ace-nav-unique-accesskeys
ace-aria-allowed-role
ace-aria-dialog-name
ace-aria-text-no-focus
ace-aria-treeitem-name
ace-struct-no-empty-heading
ace-table-no-empty-header
ace-struct-frame-tested
ace-struct-heading-order
ace-img-no-redundant-alt
ace-form-label-visible
ace-landmark-banner-top
ace-landmark-complementary-top
ace-landmark-contentinfo-top
ace-landmark-main-top
ace-landmark-single-banner
ace-landmark-single-contentinfo
ace-landmark-single-main
ace-landmark-unique-label
ace-meta-viewport-zoom
ace-struct-has-h1
ace-aria-presentation-conflict
ace-landmark-all-content
ace-table-scope-valid
ace-nav-skip-link
ace-nav-no-positive-tabindex
ace-table-unique-name
ace-text-contrast-aaa
ace-nav-identical-link-purpose
ace-meta-no-refresh-strict
ace-aria-tab-name
ace-struct-summary-name
ace-landmark-one-main
ace-meta-orientation-lock
ace-nav-focus-order
ace-struct-hidden-content
ace-form-label-content-match
ace-struct-no-p-as-heading
ace-table-no-fake-caption
ace-table-td-has-header
ace-struct-unique-id
ace-struct-unique-active-id
Rule ID: ace-meta-lang-mismatch

Check that lang and xml:lang attributes on the HTML element specify the same base language

WCAG 2.0 (A) - WCAG 2.2 (A) 3.1.1: Language of Page Blind Deafblind Cognitive User Impact