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

Mon Aug 28 04:16:37 PDT 2017

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Mark Byers
@ibComMYDS

> On 28 Aug 2017, at 8:09 pm, Jorge . <chocolate.camera at gmail.com> wrote:
> 
> In fact, “About this service” at https://about.validator.nu/#presets
> does document the service as having presets for “XHTML5
> (experimental)” and “XHTML5+ARIA, SVG 1.1 plus MathML 2.0
> (experimental)”, but that is apparently not true now.
> 
>> On Mon, Aug 28, 2017 at 12:04 PM, 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 XHTML5.
>> 
>> 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.
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