1560361 - Inspector adds the "custom" badge for elements in a non-matching namespace

Status: NEW

(DevTools :: Inspector, defect, P2)

Description

[Andrew Swan [:aswan]]

Since bug 1480465 we have been able to use customElements with XUL. When an element is defined, the registry checks the prototype chain of the CE class and it marks the definition as only applying to the html namespace if the chain includes HTMLElement or as only applying to the xul namespace if the chain includes XULElement.

It appears that the devtools inspector just matches the element name and isn't aware of the namespace subtlety. In particular, xul buttons have a custom element definition, but that element is only attached to xul buttons. In a chrome-privileged (x)html document, the toolbox inspector incorrectly shows html buttons as being custom elements.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Bugbug thinks this bug is a task, but please change it back in case of error.

Comment 2

[Andrew Swan [:aswan]]

Not sure where bugbug got that idea...

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

The priority flag is not set for this bug.
:gl, could you have a look please?

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