WCAG 2.0 (Level AA)

Abbreviation	WCAG2-AA
Long Name	Web Content Accessibility Guidelines (WCAG), Version 2.0, Level AA
Published Date	2008-12-11
URL	http://www.w3.org/TR/WCAG20/#a
Status	Enabled
Open To Public	Yes

Checks

1.1 Text Alternatives: Provide text alternatives for any non-text content

Success Criteria 1.1.1 Non-text Content (A)

Element	Error Type	Description	Check ID
applet	Potential	<code>applet</code> contains a text equivalent in the <code>alt</code> attribute of the <code>applet</code>.	23
applet	Potential	<code>applet</code> contains a text equivalent in the body of the <code>applet</code>.	25
area	Potential	Alt text for all <code>area</code> elements contains all non decorative text in the image area.	194
area	Likely	<code>area</code> link to sound file must have text transcript.	66
area	Potential	Alt text for all <code>area</code> elements identifies the link destination.	65
area	Known	All <code>area</code> elements have an <code>alt</code> attribute.	64
embed	Known	All <code>embed</code> elements have an associated <code>noembed</code> element that contains a text equivalent to the <code>embed</code> element.	163
img	Likely	Alt text is not the same as the filename unless author has confirmed it is correct.	2
img	Potential	<code>title</code> attribute for all <code>img</code> elements is absent or the empty string ("") if the image is decorative.	239
img	Potential	Alt text for all <code>img</code> elements that are not used as source anchors conveys the same information as the image.	178
img	Potential	Alt text for all <code>img</code> elements is the empty string ("") if the image is decorative.	16
img	Potential	A long description is used for each <code>img</code> element that does not have Alt text conveying the same information as the image.	8
img	Known	Alt text for all <code>img</code> elements used as source anchors is not empty when there is no other text in the anchor.	7
img	Likely	Alt text for all <code>img</code> elements is not placeholder text unless author has confirmed it is correct.	6
img	Potential	Image Alt text is short.	3
img	Known	All <code>img</code> elements have an <code>alt</code> attribute.	1
input	Potential	Alt text for all <code>input</code> elements with a <code>type</code> attribute value of "image" identifies the purpose or function of the image.	59
input	Likely	Alt text for all <code>input</code> elements with a <code>type</code> attribute value of "image" is less than 100 characters (English) or the user has confirmed that the Alt text is as short as possible.	60
input	Likely	Image used in <code>input</code> element - Alt text should not be placeholder text.	62
input	Known	All <code>input</code> elements with a <code>type</code> attribute value of "image" have an <code>alt</code> attribute.	58
input	Potential	Alt text for all <code>input</code> elements with a <code>type</code> attribute value of "image" contains all non decorative text in the image.	193
input	Known	All <code>input</code> elements, except those with with a <code>type</code> attribute value of "image", do not have an <code>alt</code> attribute.	238
object	Potential	All <code>objects</code> contain a text equivalent of the <code>object</code>.	80

1.2 Time-based Media: Provide alternatives for time-based media.

Success Criteria 1.2.1 Audio-only and Video-only (Prerecorded) (A)

Element	Error Type	Description	Check ID
a	Potential	Sound file must have a text transcript.	17
a	Likely	Links to multimedia require a text transcript.	20
a	Likely	Links to multimedia have a link to text alternative.	145

Success Criteria 1.2.2 Captions (Prerecorded) (A)

None Found.

Success Criteria 1.2.3 Audio Description or Media Alternative (Prerecorded) (A)

Element	Error Type	Description	Check ID
object	Potential	<code>object</code> link to multimedia file require equivalent alternatives (e.g., captions or auditory descriptions of the visual track).	146
object	Potential	<code>object</code> may require a long description.	160

Success Criteria 1.2.4 Captions (Live) (AA)

None Found.

Success Criteria 1.2.5 Audio Description (Prerecorded) (AA)

None Found.

1.3 Adaptable: Create content that can be presented in different ways (for example simpler layout) without losing information or structure.

Success Criteria 1.3.1 Info and Relationships (A)

Element	Error Type	Description	Check ID
body	Potential	All changes in text direction are marked using the <code>dir</code> attribute.	271
body	Potential	Unicode right-to-left marks or left-to-right marks are used whenever the HTML bidirectional algorithm produces undesirable results.	270
body	Potential	All visual lists are marked.	248
body	Potential	Table markup is used for all tabular information.	241
caption	Potential	Table captions identify the table.	242
form	Known	All radio button groups are marked using <code>fieldset</code> and <code>legend</code> elements.	168
form	Known	All checkbox groups are marked using <code>fieldset</code> and <code>legend</code> elements.	247
input	Known	All <code>input</code> elements, <code>type</code> of "file", have a <code>label</code> containing text.	216
input	Known	All <code>input</code> elements, <code>type</code> of "password", have an explicitly associated <code>label</code>.	118
input	Known	All <code>input</code> elements, <code>type</code> of "checkbox", have an explicitly associated <code>label</code>.	119
input	Known	All <code>input</code> elements, <code>type</code> of "file", have an explicitly associated <code>label</code>.	120
input	Known	All <code>input</code> elements, <code>type</code> of "radio", have an explicitly associated <code>label</code>.	121
input	Potential	All <code>input</code> elements, <code>type</code> of "password", have a label that is positioned close to the control.	122
input	Potential	All <code>input</code> elements, <code>type</code> of "checkbox", have a label that is positioned close to the control.	123
input	Potential	All <code>input</code> elements, <code>type</code> of "file", have a label that is positioned close to the control.	124
input	Potential	All <code>input</code> elements, <code>type</code> of "radio", have a label that is positioned close to the control.	125
input	Known	All <code>input</code> elements, <code>type</code> of "text", have a <code>label</code> containing text.	213
input	Potential	All <code>input</code> elements, <code>type</code> of "text", have a label that is positioned close to the control.	211
input	Known	All <code>input</code> elements, <code>type</code> of "password", have a <code>label</code> containing text.	207
input	Known	All <code>input</code> elements, <code>type</code> of "checkbox", have a <code>label</code> containing text.	206
input	Known	All <code>input</code> elements, <code>type</code> of "text", have an explicitly associated label.	57
input	Known	All <code>input</code> elements, <code>type</code> of "radio", have a <code>label</code> containing text.	204
p	Likely	All <code>p</code> elements are not used as headers.	82
pre	Potential	<code>pre</code> element should not be used to create tabular layout.	154
select	Known	All <code>select</code> elements have a label that contains text.	208
select	Potential	All <code>select</code> elements have a label that is positioned close to the control.	209
select	Known	All <code>select</code> elements have an explicitly associated <code>label</code>.	91
table	Known	All layout <code>tables</code> have an empty <code>summary</code> attribute or no <code>summary</code> attribute.	114
table	Potential	All data table summaries describe navigation and structure of the table.	203
table	Known	Data tables that contain more than one row/column of headers use the <code>id</code> and <code>headers</code> attributes to identify cells.	245
table	Known	Data tables that contain both row and column headers use the <code>scope</code> attribute to identify cells.	244
table	Known	Table summaries do not duplicate the table captions.	243
table	Potential	All complex data tables have a summary.	111
table	Known	All data <code>table</code> summaries contain text.	112
table	Potential	Use <code>colgroup</code> and <code>col</code> elements to group columns.	231
table	Potential	Use <code>thead</code> to group repeated table headers, <code>tfoot</code> for repeated table footers, and <code>tbody</code> for other groups of rows.	230
table	Known	All layout tables do not contain <code>caption</code> elements.	115
table	Potential	All data tables contain <code>th</code> elements.	136
table	Potential	All layout tables do not contain <code>th</code> elements.	137
table	Potential	All data tables contain a <code>caption</code> unless the table is identified within the document.	151
textarea	Known	All <code>textarea</code> elements have a <code>label</code> containing text.	212
textarea	Potential	All <code>textarea</code> elements have a label that is positioned close to control.	96
textarea	Known	All <code>textarea</code> elements have an explicitly associated label.	95

Success Criteria 1.3.2 Meaningful Sequence (A)

None Found.

Success Criteria 1.3.3 Sensory Characteristics (A)

Element	Error Type	Description	Check ID
body	Potential	All text references do not use shape, size, or relative position alone.	250
table	Potential	All layout <code>tables</code> make sense when linearized.	133

1.4 Distinguishable: Make it easier for users to see and hear content including separating foreground from background.

Success Criteria 1.4.1 Use of Color (A)

Element	Error Type	Description	Check ID
applet	Potential	<code>applet</code> should not use color alone.	21
body	Known	All text colors or no text colors are set.	252
img	Potential	For all <code>img</code> elements, text does not refer to the image by color alone.	14
img	Potential	The luminosity contrast ratio between text and background color in all images is at least 5:1.	251
input	Potential	<code>input</code> should not use color alone.	55
object	Potential	<code>object</code> must not use color alone.	73
script	Potential	Color alone should not be used in the <code>script</code>.	86

Success Criteria 1.4.2 Audio Control (A)

None Found.

Success Criteria 1.4.3 Contrast (Minimum) (AA)

Element	Error Type	Description	Check ID
a	Known	Visited link text colour must contrast sufficiently with its background colour.	302
a	Known	Active link text colour must contrast sufficiently with its background colour.	303
a	Known	Selected link text colour must contrast sufficiently with its background colour.	304
a	Known	Link text colour must contrast sufficiently with its background colour.	305
all elements	Known	Provide sufficient contrast between text and background colours.	301

Success Criteria 1.4.4 Resize text (AA)

Element	Error Type	Description	Check ID
b	Known	<code>b</code> (bold) element is not used.	116
basefont	Known	<code>basefont</code> must not be used.	176
font	Known	<code>font</code> must not be used.	177
i	Known	<code>i</code> (italic) element is not used.	117

Success Criteria 1.4.5 Images of Text (AA)

Element	Error Type	Description	Check ID
img	Potential	Alt text for all <code>img</code> elements contains all text in the image unless the image text is decorative or appears elsewhere in the document.	11

2.1 Keyboard Accessible: Make all functionality available from a keyboard.

Success Criteria 2.1.1 Keyboard (A)

Element	Error Type	Description	Check ID
all elements	Potential	All <code>ondblclick</code> event handlers have corresponding keyboard-specific functions.	103
all elements	Known	All <code>onmousedown</code> event handlers have an associated <code>onkeydown</code> event handler.	104
all elements	Potential	All <code>onmousemove</code> event handlers have corresponding keyboard-specific functions.	105
all elements	Known	All <code>onmouseout</code> event handlers have an associated <code>onblur</code> event handler.	106
all elements	Known	All <code>onmouseover</code> event handlers have an associated <code>onfocus</code> event handler.	107
all elements	Known	All <code>onmouseup</code> event handlers have an associated <code>onkeyup</code> event handler.	108
applet	Potential	<code>applet</code> user interface must be accessible.	26
object	Potential	<code>object</code> user interface must be accessible - (codebase).	76
script	Potential	User interface for <code>script</code> must be accessible.	89

Success Criteria 2.1.2 No Keyboard Trap (A)

Element	Error Type	Description	Check ID
applet	Potential	<code>applet</code> provides a keyboard mechanism to return focus to the parent window.	258
embed	Potential	<code>embed</code> provides a keyboard mechanism to return focus to the parent window.	260
object	Potential	<code>object</code> provides a keyboard mechanism to return focus to the parent window.	259

2.2 Enough Time: Provide users enough time to read and use content.

Success Criteria 2.2.1 Timing Adjustable (A)

Element	Error Type	Description	Check ID
meta	Known	Meta refresh is not used with a time-out.	72

Success Criteria 2.2.2 Pause, Stop, Hide (A)

Element	Error Type	Description	Check ID
blink	Known	<code>blink</code> element is not used.	27
marquee	Known	<code>marquee</code> element is not used.	69
meta	Known	Auto-redirect must not be used.	71

2.3 Seizures: Do not design content in a way that is known to cause seizures.

Success Criteria 2.3.1 Three Flashes or Below Threshold (A)

Element	Error Type	Description	Check ID
applet	Potential	<code>applets</code> cause screen flicker.	22
img	Potential	All <code>img</code> elements have associated images that do not flicker.	10
object	Potential	All <code>objects</code> do not flicker.	30
script	Potential	<code>script</code> should not cause screen flicker.	87

2.4 Navigable: Provide ways to help users navigate, find content, and determine where they are.

Success Criteria 2.4.1 Bypass Blocks (A)

Element	Error Type	Description	Check ID
body	Potential	A "skip to content" link appears on all pages with blocks of material prior to the main document.	28
body	Potential	All groups of links with a related purpose are marked.	262
frame	Known	All <code>frames</code> have a <code>title</code> attribute.	31
frame	Potential	All <code>frame</code> <code>titles</code> identify the purpose or function of the <code>frame</code>.	32
pre	Likely	ASCII art should have a skipover link.	84

Success Criteria 2.4.2 Page Titled (A)

Element	Error Type	Description	Check ID
head	Known	Document contains a <code>title</code> element.	50
title	Known	<code>title</code> contains text.	51
title	Likely	<code>title</code> is short.	52
title	Likely	<code>title</code> is not placeholder text.	53
title	Potential	<code>title</code> describes the document.	54

Success Criteria 2.4.3 Focus Order (A)

None Found.

Success Criteria 2.4.4 Link Purpose (In Context) (A)

Element	Error Type	Description	Check ID
a	Potential	Link text is meaningful when read out of context.	19
a	Likely	Suspicious link text.	173
a	Known	Each source anchor contains text.	174

Success Criteria 2.4.5 Multiple Ways (AA)

Element	Error Type	Description	Check ID
body	Potential	Sites must have a site map.	184

Success Criteria 2.4.6 Headings and Labels (AA)

Element	Error Type	Description	Check ID
h1	Known	The header following an <code>h1</code> is <code>h1</code> or <code>h2</code>.	37
h1	Potential	All <code>h1</code> elements are not used for formatting.	42
h2	Known	The header following an <code>h2</code> is <code>h1</code>, <code>h2</code> or <code>h3</code>.	38
h2	Potential	All <code>h2</code> elements are not used for formatting.	43
h3	Known	The header following an <code>h3</code> is <code>h1</code>, <code>h2</code>, <code>h3</code> or <code>h4</code>.	39
h3	Potential	All <code>h3</code> elements are not used for formatting.	44
h4	Known	The header following an <code>h4</code> is <code>h1</code>, <code>h2</code>, <code>h3</code>, <code>h4</code> or <code>h5</code>.	40
h4	Potential	All <code>h4</code> elements are not used for formatting.	45
h5	Known	The header following an <code>h5</code> is <code>h6</code> or any header less than <code>h6</code>.	41
h5	Potential	All <code>h5</code> elements are not used for formatting.	46
h6	Potential	All <code>h6</code> elements are not used for formatting.	47

Success Criteria 2.4.7 Focus Visible (AA)

None Found.

3.1 Readable: Make text content readable and understandable.

Success Criteria 3.1.1 Language of Page (A)

Element	Error Type	Description	Check ID
html	Known	Document has required <code>lang</code> attribute(s).	48
html	Known	Document has valid language code.	49
html	Known	Reading order direction is marked using the html element's <code>dir</code> attribute if the document's primary language is read right to left.	273

Success Criteria 3.1.2 Language Parts (AA)

Element	Error Type	Description	Check ID
body	Potential	Words and phrases not in the document's primary language are marked.	110

3.2 Predictable: Make Web pages appear and operate in predictable ways.

Success Criteria 3.2.1 On Focus (A)

Element	Error Type	Description	Check ID
body	Potential	Loading the web page does not cause a new window to open.	275

Success Criteria 3.2.2 On Input (A)

Element	Error Type	Description	Check ID
all elements	Potential	Change of context occurs only by user activation unless a warning is provided.	274
area	Likely	<code>area</code> should not open new window without warning.	68
select	Likely	All <code>select</code> elements do not cause an extreme change in context.	92

Success Criteria 3.2.3 Consistent Navigation (AA)

Element	Error Type	Description	Check ID
body	Potential	Repeated components appear in the same relative order each time they appear.	276
form	Potential	The tab order specified by <code>tabindex</code> attributes follows a logical order.	265
frameset	Potential	Repeated blocks of content appear in the same <code>frame</code> within the <code>frameset</code>.	263

Success Criteria 3.2.4 Consistent Identification (AA)

Element	Error Type	Description	Check ID
blockquote	Potential	<code>blockquote</code> must not be used for indentation.	100
body	Potential	Use the <code>blockquote</code> element to mark up block quotations.	131
ol	Likely	List items must not be used to format text.	81

3.3 Input Assistance: Help users avoid and correct mistakes.

Success Criteria 3.3.1 Error Identification (A)

Element	Error Type	Description	Check ID
form	Potential	All form submission error messages identify any empty required fields.	267

Success Criteria 3.3.2 Labels or Instructions (A)

Element	Error Type	Description	Check ID
body	Known	Each <code>input</code> element has only one associated <code>label</code>.	187
form	Potential	All <code>form</code> fields that are required are indicated to the user as required.	246
input	Known	Each label associated with an <code>input</code> element contains text.	188
input	Potential	Each label describes its asssociated <code>input</code> element.	189
input	Potential	All <code>input</code> elements, <code>type</code> of "file", have a <code>label</code> that describes the purpose or function of the control.	205
input	Potential	All <code>input</code> elements, <code>type</code> of "password", have a <code>label</code> that describes the purpose or function of the control.	217
input	Potential	All <code>input</code> elements, <code>type</code> of "text", have a <code>label</code> that describes the purpose or function of the control.	218
input	Potential	All <code>input</code> elements, <code>type</code> of "checkbox", have a <code>label</code> that describes the purpose or function of the control.	219
input	Potential	All <code>input</code> elements, <code>type</code> of "radio", have a <code>label</code> that describes the purpose or function of the control.	220
select	Potential	All <code>select</code> elements have a label that describes the purpose or function of the control.	210

Success Criteria 3.3.3 Error Suggestion (AA)

Element	Error Type	Description	Check ID
form	Potential	All form submission error messages provide assistance in correcting the error.	268

Success Criteria 3.3.4 Error Prevention (Legal, Financial, Data) (AA)

Element	Error Type	Description	Check ID
form	Potential	Form submission data is presented to the user before final acceptance for all irreversable transactions.	269
form	Potential	Information deleted using a web page can be recovered.	272

4.1 Compatible: Maximize compatibility with current and future user agents, including assistive technologies.

Success Criteria 4.1.1 Parsing (A)

Element	Error Type	Description	Check ID
body	Known	<code>id</code> attributes must be unique.	185

Success Criteria 4.1.2 Name, Role, Value (A)

None Found.