Chrome False Positive For 3D Transforms #240

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deleteme opened this Issue Apr 18, 2011 · 15 comments

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@deleteme

When Chrome disables GPU acceleration due to thinking it is running on a system with old drivers, it disables 3D CSS transforms (or butchers elements using those styles).

Modernizr's attempt at detecting this feature via '-webkit-perspective' in document.body.style returns true, which is a false positive.

Related Links:

A member of the chromium team responded to my initial request with,

"The CSS 3D Transforms draft specification (http://www.w3.org/TR/css3-3d-transforms) does not specify that this should be the behavior of -webkit-perspective under these circumstances. It's also not clear that document.body.style's -webkit-perspective is the best way to return information about whether 3D CSS Transforms are enabled.

Changed this to feature request."

@paulirish
Member

Thanks for filing this.

In the past just checking the perspective prop in Chrome false positived for a while, but the 3dtransforms media query has been successful in the past in beating the FP.

Can't dig into this at the moment but I appreciate the ticket filing against chrome asking for reliable feature detects. :)

@altryne
altryne commented May 6, 2011

Don't know if this related, maybe it is, i chrome 12 dev channel, the 3d test gives a false negative on windows. Haven't tested on macs.

@paulirish
Member

I've sinced confirmed with the chrome GPU team that the MQ is an indicator of if a GPU made it past the blacklist. so that's good.

i feel good about the MQ test for webkit... can either of you repro a false positive still in chrome 13+

@deleteme

What is 'MQ'?

@paulirish
Member

media query.. i'm talking about the media query -webkit-transform-3d that we use

@deleteme
deleteme commented Sep 1, 2011

I do not believe it is working as it should.

I am running Chrome 13 in a Windows XP in a VirtualBox virtual machine, and I'm pretty sure that Chrome isn't using 3d transforms, Modernizr says it is.

Screenshot of the snowstack demo, showing that 3d transforms do not work: http://cl.ly/2A201u3N1T1j3i1H2024

Screenshot of the modernizr test page, showing that it thinks that 3d transforms are supported: http://cl.ly/151h152R0L20300e0t2q

Screenshot of the lower portion of the modernizr test page, under the 'when can i use' stuff: http://cl.ly/2v3H2g0o1m2j1g090R0u

@deleteme
deleteme commented Sep 1, 2011

My previous post assumes that the new media query technique is used here: http://modernizr.github.com/Modernizr/test/

@deleteme

http://jsfiddle.net/kf8Yx/3/light/ is a page that has:

<div id="passed">Browser passed -webkit-transform-3d media query.</div>

<div id="failed">Browser failed -webkit-transform-3d media query.</div>
#passed {
    border: 1px solid green;
    display: none;
}
#failed {
    border: 1px solid red;
    display: block;
}

@media screen and (-webkit-transform-3d) {
  #passed {
    display: block;
  }
  #failed {
    display: none;
  }
}

Can anybody manage to get Chrome to display the #failed div? (Meaning that Chrome is not supporting GPU acceleration?) So far, I've only been able to get it to display #passed.

@paulirish
Member

Hmm.. Now a way to get Chrome to fix this..

@deleteme can you verify the same thing in chrome canary.. then go to about:gpu and copy that info and file this all at new.crbug.com ?

That would be wonderful :)

@deleteme

Filed http://code.google.com/p/chromium/issues/detail?id=107144. I was unable to install Canary.

@paulirish
Member

okay. :)

thank you sir

@paulirish
Member

I swear there's another crbug with this issue.

VIrtualBox OS's dont have GPUs so they always have weird bugs like this
i dont think its high on chrome's priority list to fix bugs for machines without real hardware.. so i think this may just always exist.

..

@deleteme

I wonder if I got a more recent copy of Windows, the Chromium team may be more inclined to fix this. Windows XP may not be worth developing for.

@paulirish
Member

chrome still supports winXP, but yes i would imagine less bugs on win7. :)
supporting 3d transforms on XP requires some interesting aerobatics..

@paulirish
Member

closing this in honor of the more recent #590 which has the upstream bug.

@paulirish paulirish closed this Jul 19, 2012
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