Rule 6.3.2

Summary

This test consists in checking whether the text of each image link is enough explicit to understand the purpose and the target out of its context.

Business description

Criterion

6.3

Test

6.3.2

Description

Chaque intitulé de lien image (contenu de l'attribut alt, texte entre <canvas> et </canvas> ou texte entre <object> et </object>) est-il explicite hors contexte (hors cas particuliers) ?

Level

AAA

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>, <canvas> or <object> (img , object[type^=image], object[data^=data:image], object[data$=png], object[data$=jpeg], object[data$=jpg],object[data$=bmp], object[data$=gif], canvas) (assuming the definition of an image link in Rgaa 3.0)

Set3

All the elements of Set2 with a child tag with a not empty textual alternative (assuming the definition of an image link in Rgaa 3.0)

Process

Test1

For each element of Set2, we check whether the link content doesn't belong to the text link blacklist.

For each element returning false in Test1, raise a MessageA, raise a MessageB instead.

Test2

For each element of Set2, we check whether the link content doesn't only contain non alphanumeric characters.

For each element returning false in Test2, raise a MessageA, raise a MessageB instead

  • code : UnexplicitLink
  • status: Failed
  • parameter : link text, "title" attribute, snippet
  • present in source : yes
  • code : CheckLinkWithoutContextPertinence
  • status: Need More Info
  • parameter : link text, "title" attribute, snippet
  • present in source : yes

Analysis

Not Applicable

The page has no image link (Set1 is empty)

Failed

At least one image link has a child tag with an alternative content that is blacklisted or that only contains non alphanumerical characters (Test1 OR Test2 returns false for at least one element)

Pre-Qualified

In all other cases

Notes

We assume here that the image links with only one child of type <img>, <canvas>, or <object>