  desynchronized: false,
            willReadFrequently: false,
            colorSpace: "srgb",
            colorType:"unorm8"}},
    // alpha
    {testDescription: "Test offscreen context creation attributes alpha: true",
        canvasContextAttributes: {alpha: true},
        expectedContextAttributes: {alpha: true}},
    {testDescription: "Test offscreen context creation attributes alpha: false",
        canvasContextAttributes: {alpha: false},
        expectedContextAttributes: {alpha: false}},
    // c