887142 - Dump some message about CSS3 transform non-invertible current transformation matrix for developers.

Status: NEW

(Core :: Web Painting, defect)

Description

[Tetsuharu OHZEKI [:tetsuharu] (UTC+9)]

This is proposal.

According to the spec of CSS3 transform, some specifying causes "non-invertible current transformation matrix (CTM)".
http://www.w3.org/TR/css3-transforms/#transform-function-lists

In such case, the object and their contents are not displayed. However, there is no debug information about it for web developer on the current Gecko.

So I propose that Gecko should provides some warning about "non-invertible current transformation matrix (CTM)" for web developer on rendering. I think it's better their messages are dumped in console.

Comment 1

[Boris Zbarsky [:bzbarsky]]

It's not uncommon for people to set scaleY(0) and then animate it to scaleY(1) to get a windowshade effect.  We wouldn't really want to warn in this case, in my opinion....

Comment 2

[Tetsuharu OHZEKI [:tetsuharu] (UTC+9)]

(In reply to Boris Zbarsky (:bz) (reading mail, but on paternity leave) from comment #1)
> It's not uncommon for people to set scaleY(0) and then animate it to
> scaleY(1) to get a windowshade effect.  We wouldn't really want to warn in
> this case, in my opinion....

Umm... After all, is it hard? How about does it provide messages only when user is turning on the debugging pref?