## spec HTML5
https://dev.w3.org/html5/spec-LC/
https://html.spec.whatwg.org/

## validateur html :
https://validator.w3.org/

## validateur css :
https://jigsaw.w3.org/css-validator/

## spec CSS
https://www.w3.org/Style/CSS/Overview.en.html

## spec WAI
https://www.w3.org/WAI/

## guide WCAG
https://www.w3.org/WAI/standards-guidelines/wcag/

##référentiel accessibilité des administrations (RGAA)
https://www.numerique.gouv.fr/publications/rgaa-accessibilite/

## css_selectors
https://www.w3schools.com/cssref/css_selectors.asp