tes desynchronized: true",
        canvasContextAttributes: {desynchronized: true},
        expectedContextAttributes: {desynchronized: true}},
    {testDescription: "Test offscreen context creation attributes desynchronized: false",
        canvasContextAttributes: {desynchronized: false},
        expectedContextAttributes: {desynchronized: false}},
    // willReadFrequently
    {testDescription: "Test offscreen context creation attributes willReadFrequently: true",
        canvasContextAttributes: {willRe