1507849 - The type of template contents owner document is incorrect on XHTML documents

Status: NEW

(Core :: DOM: Core & HTML, defect, P3)

Description

[David Rivron]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0

Steps to reproduce:

On a XHTML document :
document.createElement('template').content.ownerDocument.contentType


Actual results:

The content type is "text/html" which is incorrect. The assignment of innerHTML on the template will parse as HTML, not as XHTML.


Expected results:

The template contents owner document should be of the same type of the template owner document. Chrome, Edge ansd Safari have a correct behavior.

Comment 1

[Anne (:annevk)]

Per the HTML Standard this should always be "application/xml", even if the document is marked as HTML (as that doesn't affect this field). Added a comment to https://github.com/whatwg/html/issues/2109 to ensure this gets tested.

The bigger issue here though is that it's type (which isn't exposed by contentType) is not XML.

Comment 2

[David Rivron]

> which isn't exposed by contentType
I don't know any other way to inspect the 'type' of a document.

> Per the HTML Standard this should always be "application/xml", even if the document is marked as HTML (as that doesn't affect this field).
Do you say that the template contents owner document (tcod) should be 'application/xml' even if the host document (and therefore the tcod) uses the HTML syntax ?

Chrome and Safari return "application/xml" but Edge returns "application/xhtml+xml" for the tcod on a host document served with "application/xhtml+xml".
All use the HTML syntax and return 'text/html' as the contentType for the tcod on a HTML host document.

Comment 3

[Anne (:annevk)]

Yeah, but I agree that maybe HTML should be changed to use "text/html" here for the HTML document case (you can detect it by seeing if element local names get lowercased when you create them).