Embed HTML into an HTML5 SVG fragment got wrong namespace in template

[rrandom]

Version

2.4.4

Reproduction link

https://jsfiddle.net/sn7o1mm3/

Steps to reproduce

Embed <p xmlns="http://www.w3.org/1999/xhtml"> in the svg element

What is expected?

the <p> should be rendered as a htmlElment and show.

What is actually happening?

<p> did not show

---

seems related to this #6506

[defcc]

Thanks @rrandom . An issue related with #6506

A svg namespace now is attached to the p element within foreignObject, so it gets an unexpected behavior.

I'm trying to fix it.

PS, it seems also broken with the previous vue version because of the isSVG check, as isSVG checks the lowercased of foreignObject

Something more about https://developer.mozilla.org/en-US/docs/Web/SVG/Element/foreignObject

[javoski]

Seems that the parameter of method createElementNS is case-sensitive.
https://dom.spec.whatwg.org/#internal-createelementns-steps