[html5] Validator.nu’s (X)HTML5 Validator does not validate XHTML5

Paul Raso paul at educationinvolved.org
Mon Aug 28 08:59:53 PDT 2017

unsubscribe already wtf

Paul Raso
Executive Director
Education Involved Advocacy Group
paul at educationinvolved.org
#morethanonewaytolearn #yourworldisourclassroom

On Mon, Aug 28, 2017 at 6:04 AM, Jorge . <chocolate.camera at gmail.com> wrote:

> Validator.nu (X)HTML5 Validator at https://html5.validator.nu
> validates only HTML5, not XHTML5, despite its name, when attempting to
> do so via direct input (Text Field).
> Tested with this markup:
> <?xml version="1.0" encoding="UTF-8"?>
> <!DOCTYPE html>
> <html xmlns="http://www.w3.org/1999/xhtml">
>    <head>
>       <meta charset="UTF-8"/>
>       <title>My title</title>
>    </head>
>    <body>
>    </body>
> </html>
> The submission form does not have an option to forcibly request XHTML5
> validation instead of HTML5. Even when the markup is preceded by the
> XML declaration (which nevertheless is purportedly not necessary if
> contents are UTF-8), the validator reports the very declaration as an
> error:
> > Error: Saw <?. Probable cause: Attempt to use an XML processing
> instruction in HTML. (XML processing instructions are not supported in
> HTML.)
> revealing that even with such markup it is validating HTML5 instead of
> The generic validator at https://validator.nu used to have a preset or
> parser (cannot remember) specifically for XHTML5, but not anymore
> either it seems.
> _______________________________________________
> whatwg at whatwg.org
> https://whatwg.org/mailing-list#specs
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