adFrequently: true},
        expectedContextAttributes: {willReadFrequently: true}},
    {testDescription: "Test offscreen context creation attributes willReadFrequently: false",
        canvasContextAttributes: {willReadFrequently: false},
        expectedContextAttributes: {willReadFrequently: false}},
    // colorType
    {testDescription: "Test context creation attributes colorType: unorm8",
        canvasContextAttributes: {colorType: "unorm8"},
        expectedContextAttributes: {colorType: "unorm8"}}