context menu seem in netsurf core in, and need not support from the AOS GUI.
, but i dont know how this activate in SDL.
In desktop/browser.c file is this that should over a link open a menu.But when press right mousebutton do same as left mouse button.
That code is for form select menus, not context menus. The select menu code could probably be used to create context menus on framebuffer, but at the moment AFAIK there is no context menu code in the framebuffer version.