{ "png", 0, 0, OptionArg.STRING, ref opt_target_png, "File to write (PNG)", null },
{ "inject", 0, 0, OptionArg.STRING_ARRAY, ref opt_inject_js, "Inject Javascript file(s)", null },
{ "pdf", 0, 0, OptionArg.STRING, ref opt_target_pdf, "File to write (PDF)", null },
{ "png", 0, 0, OptionArg.STRING, ref opt_target_png, "File to write (PNG)", null },
{ "inject", 0, 0, OptionArg.STRING_ARRAY, ref opt_inject_js, "Inject Javascript file(s)", null },
{ "pdf", 0, 0, OptionArg.STRING, ref opt_target_pdf, "File to write (PDF)", null },