Je přístupnější webová stránka, na které jsou dva obrázky z deseti s chybným alternativním textovým popiskem, nebo stránka s pěti obrázky, z nichž jen jeden má chybně vyplněný alt popisek? A co stránka s formulářem, kde není jednomu formulářovému prvku přiřazen správný popisek?
Měření úrovně přístupnosti webu je důležité pro vyhodnocení toho, do jaké míry je přístupnost implementována, a také pro sledování zlepšení přístupnosti. Pokud nejsme schopni přístupnost změřit, těžko můžeme zjistit, zda se po úpravách webové stránky zlepšila, či zhoršila.
Najít vhodná měřítka ale není úplně triviální. Vezměme si například WCAG 2.0. Ten pracuje se 4 úrovněmi přístupnosti (žádná, A, AA, AAA), které ale bohužel neumožňují snadné "jemnější" porovnání přístupnosti dvou webů a sledování změn. Pokud web vyhovuje všem kritériím na úrovni A a většině - ale ne všem - z úrovně AA, pak je na něj pořád nahlíženo jako na web na úrovni A a úsilí navíc (kritéria AA) se v hodnocení vůbec neprojeví.
W3C/WAI Research and Development Working Group proto připravuje online sympózium o meření míry přístupnosti a vyzývá všechny, kdo mají k tématu co říci, k účasti. Sympózium se bude konat 5. prosince, termín pro přihlášení přednášek je 1. listopadu.
Jsem docela zvědavý na výsledky, protože jsme si podobnou situací prošli u naší Metodiky Blind Friendly Web a nutno přiznat, že ani jedna metrika, kterou jsme během let stanovili a používali, stoprocentně neodrážela realitu.
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