Rule 6.1.2
Summary
This test consists in checking whether the context of each image link is enough explicit to understand the purpose and the target.
Business description
Criterion
Test
Description
Chaque lien image (contenu de l'attribut alt, texte entre <canvas> et </canvas> ou texte entre <object> et </object>) vérifie-t-il une de ces conditions (hors cas particuliers) ?
- L'intitulé de lien seul permet d'en comprendre la fonction et la destination
- Le contexte du lien permet d'en comprendre la fonction et la destination
Level
A
Technical description
Scope
page
Decision level
Semi-Decidable
Algorithm
Selection
Set1
All the <a> tags with a "href" attribute, with children (a[href]:has(*) )
Set2
All the elements of Set1 without own text and with only one child of
type <img>, <object>, or <canvas> (img , object[type^=image],
object[data^=data:image], object[data$=png], object[data$=jpeg],
object[data$=jpg],object[data$=bmp], object[data$=gif], canvas)
Set3
All the elements of Set2 with a not empty text and without context (assuming the definition of a link context in Rgaa3.0)
Set4
All the elements of Set2 with a not empty text, with a context (assuming the definition of a link context in Rgaa3.0)
in other words :
size(Set2) = size(Set3) + size(Set4)
Process
Test1
For each element of Set3, we check whether the link content is not pertinent (see Notes about relevancy detection)
For each element returning true in Test1, raise a MessageA, raise a MessageB instead
Test2
For each element of Set4, we check whether the link content is not pertinent (see Notes about relevancy detection)
For each element returning true in Test2, raise a MessageC, raise a MessageD instead
MessageA : Unexplicit Link
- code : UnexplicitLink
- status: Failed
- parameter : link text,
"title"attribute, snippet - present in source : yes
MessageB : Check link without context pertinence
- code : CheckLinkWithoutContextPertinence
- status: Need More Info
- parameter : link text,
"title"attribute, snippet - present in source : yes
MessageC : Unexplicit Link With context
- code : UnexplicitLinkWithContext
- status: Need More Info
- parameter : link text,
"title"attribute, snippet - present in source : yes
MessageD : Check link with context pertinence
- code : CheckLinkWithContextPertinence
- status: Need More Info
- parameter : link text,
"title"attribute, snippet - present in source : yes
Analysis
Not Applicable
The page has no image link (Set2 is empty)
Failed
At least one image link without context has a text content which is blacklisted or only composed of non-alphanumerical characters (Test1 returns false for at least one element)
Pre-qualified
In all other cases
Notes
We assume here that the image links have only one child of type <img>, <object> or <canvas>
Definition of not-pertinent link title :
A link title is seen as not-pertinent in the following cases :
- the link title is blacklisted (regarding the LinkTextBlacklist nomenclature)
- the link only contains not alphanumerics characters