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<html> <body> <select aria-label="selection_list" size="10" id="listbox"> <optgroup label="Enabled" id="listbox_optgroup_enabled"> <option value="listbox_e1" id="listbox_option_enabled_one">One</option> <option value="listbox_e2">Two</option> <option value="listbox_e3">Three</option> <option value="listbox_e4">Four</option> </optgroup> </select> </body> </html>