This test checks if Three.js successfully used the pre-created GL context passed from framework outside of Three.js. <br>For more information refer to <ahref="https://github.com/mrdoob/three.js/pull/4353">this issue list in Three.js github</a><hr> The screen should show 2 square boxes of size 256x256, one filled by CSS in green color, and the other filled by WebGL in red color. If the red box is shown and same in size to the green box, it indicates that the test is successful.
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<canvasid="canvas"></canvas>
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The above is the CSS filled box, not GL, in Green color.
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The below is the GL filled box, not CSS, in Red color.