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1.1.1: Non-Text Content
Applet missing text
Area element missing alternative text
Image has a null alt
Image inside link missing alternative text
Image suspected of redundant alt attribute
Input type='image' missing alternative text
Label's 'for' attribute contains an ID that does not exist in the document
The alt attribute is too long
The alt attribute is too short
Applet missing alt attribute
Empty aria-label attribute
Empty title attribute
Image missing alt attribute
Missing <noembed> element inside an <embed> element
Object element is missing a text alternative
The label's 'for' attribute points to an element that is not a form control
Title attribute cannot be used for image with empty alt attribute
Image element missing alt attribute
1.2.2: Captions (Prerecorded)
Ensure audio has captions
1.2.3: Audio Description or Media Alternative (Prerecorded)
Ensure audio description for video content
Object element is missing a text alternative
1.3.1: Info and Relationships
Empty heading
Label's 'for' attribute contains an ID that does not exist in the document
Layout table shouldn’t use <caption>
Misused emphasis markup
Suspected misuse of table summary attribute
The element is suspected to perform as a numbered list
The element is suspected to perform as an unordered list
Empty title attribute
Field's attribute aria-labelledby references to not existing element
Fieldset missing a legend
Group of fields missing fieldset
Group options elements inside a select
Missing H1 heading
The <h> elements are not structured in a logical nested way
The label's 'for' attribute points to an element that is not a form control
Missing main landmark
1.4.2: Audio Control
Element is suspected to miss stop functionality
1.4.3: Contrast (Minimum)
A text color does not have enough contrast with the background image or color
2.1.1: Keyboard
Hidden from screen reader
Missing keyboard blur event
Missing keyboard focus event
Missing keyboard focus event
Missing keyboard press event
Audio or video element suspected for keyboard trap
Button is missing content
HTML element cannot be accessed by keyboard
Input element missing value attribute
Link has no content
No initial option selected in list
2.1.2: No Keyboard Trap
Audio or video element suspected for keyboard trap
2.2.1: Timing Adjustable
Page refresh automatically without prior notification
Page redirect without prior notification
2.2.2: Pause, Stop, Hide
Use of <blink> element
2.4.1: Bypass Blocks
Area element links to not existing element
Iframe element missing title attribute
Invalid link
Missing main landmark
2.4.2: Page Titled
Empty document title
Missing document title
2.4.4: Link Purpose (In Context)
Area element missing alternative text
Image inside link missing alternative text
Image suspected of redundant alt attribute
Link's attribute aria-labelledby references to not existing element
3.1.1: Language of Page
Document is missing lang attribute
Document uses incorrect lang attribute
Document uses incorrect xml:lang attribute
3.1.2: Language of Parts
Element uses an incorrect xml:lang attribute
Element uses an incorrect lang attribute
3.2.2: On Input
Form is missing <submit> button
4.1.1: Parsing
Duplicate ID
4.1.2: Name, Role, Value
ARIA role attribute misuse
Attribute does not exist in WAI-ARIA specification
dd element is misused
dl element is misused
dt element is misused
Label's 'for' attribute contains an ID that does not exist in the document
ul element has incorrect child element(s)
Wrong ARIA role attribute's value
Button is missing content
Empty title attribute
Form field is missing label
Iframe element missing title attribute
Input element missing value attribute
li element is misused
Link has no content
Marquee element should not be used
No initial option selected in list
The label's 'for' attribute points to an element that is not a form control
User interface component missing a role describing its function
WAI-ARIA attribute mismatch
See Also
User1st.com
User1st Online Courses
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1.2.4
Ensure audio has captions