><td><a href="http://www.opengl.org/registry/specs/MESA/copy_sub_buffer.txt">MESA_copy_sub_buffer</a></td></tr>
<tr><td class="num">21</td><td>&nbsp;</td><td><a href="http://www.opengl.org/registry/specs/MESA/pixmap_colormap.txt">MESA_pixmap_colormap</a></td></tr>
<tr><td class="num">22</td><td>&nbsp;</td><td><a href="http://www.opengl.org/registry/specs/MESA/release_buffers.txt">MESA_release_buffers</a></td></tr>
<tr><td class="num">23</td><td>&nbsp;</td><td><a href="http://www.opengl.org/registry/specs