 <code class="constant">GL_BACK_RIGHT</code>,
                    <code class="constant">GL_FRONT</code>,
                    <code class="constant">GL_BACK</code>,
                    <code class="constant">GL_LEFT</code>,
                    <code class="constant">GL_RIGHT</code>, and
                    <code class="constant">GL_FRONT_AND_BACK</code>
                    are accepted.
                    The initial value is <code class="constant">GL_FRONT</code> for single-buffered contexts,
            