Asqatasun v4 - RGAA 3.0 - Rule 1.5.1
Summary
This test consists in detecting images associated with an image used as a CAPTCHA.
Business description
Criterion
Test
Description
Does each image (img
, area, object
, embed
, svg
, canvas
tags) used as CAPTCHA meet one of the following conditions?
- Another non graphic form of CAPTCHA is available, at least
- Another solution to access the functionality protected by the CAPTCHA is available
Level
A
Technical description
Scope
Page
Decision level
Semi-Decidable
Algorithm
Selection
Set1
All the <img>
tags of the page not within a link (css selector : img:not(a img)
)
Set2
All the elements of Set1 identified as a CAPTCHA (see Notes for details about CAPTCHA characterisation).
Set3
All the <object>
tags with a "type"
attribute that starts with "image/...", not within a link (css selector : object[type^=image]:not(a object)
)
Set4
All the elements of Set2 identified as a CAPTCHA (see Notes for details about CAPTCHA characterisation).
Set5
All the <embed>
tags of the page not within a link and with a "type"
attribute that starts with image/...
(css selector : embed[type^=image]:not(a embed)
)
Set6
All the elements of Set5 identified as a CAPTCHA (see Notes for details about CAPTCHA characterisation).
Set7
All the <svg>
tags of the page not within a link (css selector : svg:not(a svg)
)
Set8
All the elements of Set7 identified as a CAPTCHA (see Notes for details about CAPTCHA characterisation).
Set9
All the <canvas>
tags of the page not within a link (css selector : canvas:not(a canvas)
)
Set10
All the elements of Set9 identified as a CAPTCHA (see Notes for details about CAPTCHA characterisation).
Set11
All the <area>
tags, defined within a <map>
tag whose the "id"
attribute corresponds to the "usemap"
attribute of an <img>
tag
Set12
All the elements of Set11 identified as a CAPTCHA (see Notes for details about CAPTCHA characterisation).
Process
Test1
For each element of Set2, Set4, Set6, Set8, Set10 and Set12, raise a MessageA
MessageA
- code : CheckCaptchaAlternativeAccess
- status: Pre-Qualified
- parameter : tag name, snippet
- present in source : yes
Analysis
Not Applicable
No <img>
, <area>
, <object>
with a "type"
attribute equals to "image", <embed>
with a type
attribute equals to image
, <canvas>
or <svg>
identified as a CAPTCHA has been found on the page (Set2 AND Set4 AND Set6 AND Set8 AND Set10 AND Set12 are empty)
Pre-qualified
At least one <img>
, <area>
, <object>
with a "type"
attribute equals to "image", <embed>
with a type
attribute equals to image
, <canvas>
or <svg>
identified as a CAPTCHA has been found on the page (Set2 OR Set4 OR Set6 OR Set8 OR Set10 OR Set12 is not empty)
Notes
An element is identified as a CAPTCHA when the "captcha" occurrence is found :
- on one attribute of the element
- or within the text of the element
- or on one attribute of one parent of the element
- or within the text of one parent of the element
- or on one attribute of a sibling of the element
- or within the text of a sibling of the element