Rule 8.1.2
Summary
We check the doctype validity regarding the W3C recommandations: ( W3C Recommended list of Doctype declarations)
Business description
Criterion
Test
Description
Pour chaque page web, le type de document (balise
doctype) est-il valide ?
Level
A
Technical description
Scope
Page
Decision level
Decidable
Algorithm
Selection
Set1
The <!doctype> tag of the page
Process
Test1
We check the validity of the doctype of the page regarding the “RecommendedDoctypeDeclarations” and “RecommendedCaseInsensitiveDoctypeDeclarations” whitelists
- Used nomenclatures : “RecommendedDoctypeDeclarations”, “RecommendedCaseInsensitiveDoctypeDeclarations”
- Reference : All the doctypes declarations recommanded in http://www.w3.org/QA/2002/04/valid-dtd-list.html
MessageA : Wrong Doctype Declaration
- code: WrongDoctypeDeclaration
- status: Failed
- parameter: none
- present in source: no
Analysis
Not Applicable
The page has no doctype (Set1)
Failed
The doctype is not found among the doctype whitelist
Passed
The doctype is found among the doctype whitelist
Notes
HTML5 doctype is NOT case-sensitive: http://www.w3.org/TR/html5/syntax.html#the-doctype
HTML4: could not find formal statement about case-sensitiveness of doctype: http://www.w3.org/TR/html4/intro/sgmltut.html
XHTML1: same as HTML4 http://www.w3.org/TR/xhtml1/
From version 2.0, Asqatasun works on the generated html rendered by Firefox. We’ve noticed that for HTML 4.01 doctypes that define the doctype with the “HTML” key in Uppercase, the doctype is transformed and the “HTML” key is changed to lowercase. This behaviour is the same with chromium and opera. Regarding this fact, we decided to consider all the doctypes as case insensitive despite the W3c recommandations.