Fix for Issue #441: gl-disabled-vertex-attrib.html too strict

Move the test from the fragment shader to the vertex shader to avoid relying on the accuracy of the perspective correction implementation.
Fix for Issue #441: gl-disabled-vertex-attrib.html too strict

Move the test from the fragment shader to the vertex shader to avoid relying on the accuracy of the perspective correction implementation.
Clean up texture-npot-video.html test

Remove unused or unnecessary global variables, duplicate printouts,
clearing before calling clearAndDrawUnitQuad and re-binding the texture
in the middle of the test.
oes-vertex-array-object-bufferData test added
added missing gl.viewport, clean up, some comments
tabs to spaces
formatting
small fixes to update vao-bufferData test
typo
Add a test case for the default webgl context creation attributes.