Marker.io runs every page against 90 automated accessibility checks, built on the axe-core engine and the WCAG standard. This is the full list. Each check's severity sets its weight in your accessibility score: the higher the severity, the more a failing check pulls your score down. For how the score itself is calculated, see How Marker.io calculates your accessibility score.
In-product, you can also filter checks by category: Content & readability, Images & media, Interactive elements, Code quality, and Page structure.
How weight works
A check's severity decides how much weight it carries when we calculate your score.
Severity | Weight |
Critical | 10 |
Serious | 5 |
Medium | 2 |
Low | 1 |
A Critical check counts 10 times as much as a Low one, so fixing Critical issues moves your score the most.
All checks
Ordered by weight, highest first. Tip: use your browser's find (Cmd+F or Ctrl+F) to jump to a specific check.
Check | Severity | Category |
Required ARIA attributes are present | Critical | Code Quality |
Document body does not use ARIA hidden | Critical | Code Quality |
ARIA attribute names are valid | Critical | Code Quality |
ARIA role values are valid | Critical | Code Quality |
ARIA attribute values are valid | Critical | Code Quality |
IDs used in ARIA and labels are unique | Critical | Code Quality |
ARIA attributes are allowed for the element's role | Critical | Code Quality |
ARIA roles contain their required child roles | Critical | Code Quality |
ARIA roles are contained by their required parent roles | Critical | Code Quality |
Frames are reachable for accessibility scanning | Critical | Page Structure |
Meta refresh is not used for delayed refresh | Critical | Page Structure |
Input buttons have discernible text | Critical | Interactive Elements |
Buttons have an accessible name | Critical | Interactive Elements |
Form elements have associated labels | Critical | Interactive Elements |
Image buttons have alt text | Critical | Interactive Elements |
Select elements have associated labels | Critical | Interactive Elements |
Image map areas have alt text | Critical | Images & Media |
Videos have captions | Critical | Images & Media |
Images have alt text | Critical | Images & Media |
Lists use correct semantic markup | Serious | Code Quality |
ARIA attributes are not prohibited for the element's role | Serious | Code Quality |
ARIA braille attributes have non-braille equivalents | Serious | Code Quality |
ARIA hidden elements don't contain focusable content | Serious | Code Quality |
Accesskey values are unique | Serious | Code Quality |
ARIA dialogs have an accessible name | Serious | Code Quality |
ARIA toggle fields have an accessible name | Serious | Code Quality |
ARIA meters have an accessible name | Serious | Code Quality |
ARIA progress bars have an accessible name | Serious | Code Quality |
ARIA input fields have an accessible name | Serious | Code Quality |
Role="text" elements have no focusable children | Serious | Code Quality |
ARIA tree items have an accessible name | Serious | Code Quality |
ARIA buttons, links, and menu items have accessible names | Serious | Code Quality |
ARIA attributes are used as specified for the role | Serious | Code Quality |
ARIA tooltips have an accessible name | Serious | Code Quality |
Definition lists are properly structured | Serious | Code Quality |
List items are inside a list | Serious | Code Quality |
Definition list items are inside a definition list | Serious | Code Quality |
Page has a lang attribute | Serious | Page Structure |
Page has a non-empty title | Serious | Page Structure |
Table cell headers reference IDs in the same table | Serious | Page Structure |
Frames have a title | Serious | Page Structure |
Page lang attribute is valid | Serious | Page Structure |
Table headers have associated data cells | Serious | Page Structure |
Frame titles are unique | Serious | Page Structure |
Inline lang attributes are valid | Serious | Page Structure |
Form field autocomplete attributes are valid | Serious | Interactive Elements |
Focusable frames are keyboard reachable | Serious | Interactive Elements |
Links have a discernible name | Serious | Interactive Elements |
Scrollable regions are keyboard reachable | Serious | Interactive Elements |
Page has a mechanism to bypass navigation | Serious | Interactive Elements |
Touch targets are large enough | Serious | Interactive Elements |
Summary elements have discernible text | Serious | Interactive Elements |
Interactive controls are not nested | Serious | Interactive Elements |
Tabindex values are not positive | Serious | Interactive Elements |
Links are distinguishable without color alone | Serious | Interactive Elements |
Form labels are visible, not only in title attribute | Serious | Interactive Elements |
Inline text spacing can be adjusted | Serious | Content & Readability |
Text contrast meets accessibility standards (AA) | Serious | Images & Media |
Object elements have alt text | Serious | Images & Media |
Deprecated blink elements are not used | Serious | Images & Media |
Deprecated marquee elements are not used | Serious | Images & Media |
SVG images have alt text | Serious | Images & Media |
Role="img" elements have alt text | Serious | Images & Media |
Viewport allows zooming and scaling | Medium | Page Structure |
Page has an H1 heading | Medium | Page Structure |
Heading levels follow a logical order | Medium | Page Structure |
Page has only one main landmark | Medium | Page Structure |
Page content is contained in landmarks | Medium | Page Structure |
Page has a main landmark | Medium | Page Structure |
Table scope attributes are valid | Medium | Page Structure |
Main landmark is at top level | Medium | Page Structure |
Contentinfo landmark is at top level | Medium | Page Structure |
Landmarks have unique accessible names | Medium | Page Structure |
Complementary landmark is at top level | Medium | Page Structure |
Page has only one banner landmark | Medium | Page Structure |
Banner landmark is at top level | Medium | Page Structure |
Page has only one contentinfo landmark | Medium | Page Structure |
HTML lang and xml:lang attributes match | Medium | Page Structure |
Form fields have a single label | Medium | Interactive Elements |
Skip link targets exist and are focusable | Medium | Interactive Elements |
Audio does not autoplay without stop or mute controls | Medium | Images & Media |
ARIA role is appropriate for the element | Low | Code Quality |
Presentational elements have no global ARIA | Low | Code Quality |
ARIA roles are not deprecated | Low | Code Quality |
Headings are not empty | Low | Page Structure |
Table headers are not empty | Low | Page Structure |
Viewport can scale significantly | Low | Page Structure |
Table caption and summary differ | Low | Page Structure |
Alt text is not redundant with adjacent text | Low | Images & Media |
Server-side image maps are not used | Low | Images & Media |
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