https://sergioiglesias.net/blog/joomla/atributos-alt-longdesc-y-title-de-imagenes-en-html
Atributos alt, longdesc y title de imágenes en html - Sergio Iglesias
Uso correcto de los atributos alt, longdesc y title de imágenes en html. Accesibilidad en imágenes
atributosaltlongdesctitlehtml
https://schnurpsel.de/html-bild-attribut-longdesc-fuer-suchmaschinen-nicht-relevant-1195/
HTML Bild-Attribut longdesc für Suchmaschinen nicht relevant « Schnurpsel
Ich kann es kurz machen. Das für die längere Beschreibung eines Bildes seit HTML 4.0 vorhandene Attribut longdesc (im img-Tag) hat für Suchmaschinen keine...
htmlbildattributlongdescsuchmaschinen
https://lists.w3.org/Archives/Public/public-html/2007Sep/0154.html
Re: User Testing footage of header/id combinations, @summary and @longdesc for HTML5 WG from Joshue...
user testingfootageheadercombinationssummary
https://www.w3.org/WAI/GL/2016/WD-WCAG20-TECHS-20160223/H45
H45: Using longdesc | Techniques for WCAG 2.0
usinglongdesctechniqueswcag
https://www.w3schools.com/tAGS/att_img_longdesc.asp
HTML img longdesc Attribute
Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java, XML...
longdesc attributehtmlimg