Rule reference 

AQG ships 48 built-in rules in three categories. Every rule can be enabled or disabled individually, see Enabling rules.

The severity column shows the default severity. Some rules adjust their severity depending on the detected case, for example a missing alternative text versus a title-only fallback. The WCAG column names the success criteria a rule relates to. A rule that does not report a finding does not prove conformance with that criterion.

Severities 

Critical
A problem that very likely blocks users of assistive technology. Counted against threshold_critical of the quality gate.
Warning
A problem that degrades accessibility or is a likely failure in most contexts. Counted against threshold_warning.
Info
A recommendation. Not counted against the quality gate thresholds.
Needs review
A case the automated rule cannot decide. A person has to look at it.

RTE rules 

Applied to RTE bodytext of tt_content during content scans, and used for the inline highlighting in CKEditor.

Rule ID Default severity WCAG 2.1 / 2.2 reference
rte.img_alt_missing Critical 1.1.1
rte.img_alt_is_filename Warning 1.1.1
rte.img_alt_too_long Warning 1.1.1
rte.img_alt_redundant_phrase Warning 1.1.1
rte.image_in_link_missing_alt Critical 1.1.1, 2.4.4
rte.svg_missing_title Warning 1.1.1
rte.empty_heading Critical 1.3.1
rte.heading_hierarchy_jump Warning 1.3.1
rte.empty_link Critical 2.4.4
rte.non_descriptive_link Warning 2.4.4
rte.link_text_is_url_or_filename Warning 2.4.4
rte.link_text_duplicate_different_targets Warning 2.4.4
rte.link_to_document Needs review 2.4.4
rte.link_to_document_missing_notice Info 2.4.4
rte.link_new_window_no_warning Warning 3.2.2
rte.button_label_missing Critical 4.1.2
rte.form_control_missing_label Critical 4.1.2, 3.3.2
rte.iframe_missing_title Critical 4.1.2
rte.table_missing_header Warning 1.3.1
rte.table_th_missing_scope Warning 1.3.1
rte.table_missing_caption Info 1.3.1
rte.duplicate_id Warning 1.3.1
rte.marquee_or_blink Critical 2.2.2

Structured rules 

Applied to structured TCA field values during content scans, for example file reference metadata, content element headers and form field configuration.

Rule ID Default severity WCAG 2.1 / 2.2 reference
structured.file_reference_alt Critical 1.1.1
structured.file_reference_alt_quality Warning 1.1.1
structured.header_ctype_empty Warning 1.3.1
structured.header_link_no_text Critical 2.4.4, 4.1.2
structured.header_level_is_h1 Needs review 1.3.1
structured.uploads_file_missing_description Warning 2.4.4
structured.table_missing_caption Info 1.3.1
structured.form_placeholder_as_label Warning 1.3.1, 3.3.2
structured.form_field_label_missing Critical 1.3.1, 3.3.2
structured.form_autocomplete_missing Warning 1.3.5
structured.media_no_transcript_hint Needs review 1.2.1

Rendered HTML rules 

Applied to the server-rendered HTML of a page. They run for Scan this page, for Scan site and for single-page CLI or Scheduler runs, but not for subtree CLI or Scheduler runs and never in changed-only mode. See Rendered page checks for the full matrix.

Rule ID Default severity WCAG 2.1 / 2.2 reference
rendered.img_missing_alt Critical 1.1.1
rendered.svg_missing_accessible_name Warning 1.1.1
rendered.empty_heading Critical 1.3.1
rendered.empty_link Critical 2.4.4
rendered.empty_button Critical 4.1.2
rendered.iframe_missing_title Critical 4.1.2
rendered.form_control_missing_label Critical 4.1.2, 3.3.2
rendered.duplicate_id Warning 1.3.1
rendered.table_missing_header Warning 1.3.1
rendered.table_empty_header Warning 1.3.1
rendered.html_lang_missing Warning 3.1.1
rendered.page_title_missing Warning 2.4.2
rendered.main_landmark_missing Needs review 1.3.1
rendered.landmark_unique Needs review 1.3.1

Rules of the frontend crawler 

Frontend scans additionally run axe-core in a real browser. Their findings use the axe rule identifiers, for example color-contrast, target-size or region, and are shown on the Frontend scan tab. They are not part of the rule list above and cannot be toggled in the Rules tab.