User Agent: Mozilla/5.0 (Windows NT 6.1; rv:18.0) Gecko/20100101 Firefox/18.0 Build ID: 20130104151925 Steps to reproduce: Run https://www.khronos.org/registry/webgl/sdk/tests/conformance/canvas/drawingbuffer-test.html Actual results: testing canvas width = 16416, height = 8 FAIL Unable to fetch WebGL rendering context for Canvas FAIL context does not exist Expected results: testing canvas width = 16416, height = 8 PASS context exists

Test performed on all platforms with the same browsers (Chrome: 24.0.1312.52, Firefox: 18.0) Ubuntu 12.10, Driver Nvidia 304.64, GPU GTX-460): - FF: fails (same error) - Chrome: passes OSX 10.7.4, Driver ATI 7.18.18, GPU ATI Radeon HD 6750M - FF: fails (same error) - Chrome: fails (other error) Windows 7, Driver AMD 9.2.0.0, GPU AMD Radeon HD 6900 - FF: fails (same error) - Chrome: passes

From https://etherpad.mozilla.org/webgl-1-0-2 : Linux+Mac+Windows: canvas/drawingbuffer-test.html (18 of 20 passed) failed: Unable to fetch WebGL rendering context for Canvas failed: context does not exist It looks like we're failing to create contexts with too-large sizes, instead of reducing the drawingbuffer size. Note that Chrome has been clamping drawingbuffer dimensions to 4096 unconditionally... check if doing the same would be enough to pass the test on at least some hardware. assign to: jgilbert

Good Morning, I was planing to fix that before I found this ticket. Have you started already ? Or can I fix it ?

I believe the proper bug for this is bug 847714.

Ok I mark this bug as duplicate and I will fix 847714 with my working patch.