">
        <h2>Description</h2>
        <p>
            Available only in the fragment language, <code class="varname">gl_FragDepth</code> is an output variable
            that is used to establish the depth value for the current fragment. If depth buffering is enabled
            and no shader writes to <code class="varname">gl_FragDepth</code>, then the fixed varname value for
            depth will be used (this value is contained in the z component of <a class="citerefentry" href="gl_FragCoord"><span c