javascript - The arrows of drop-down menu are invisible in IE (IE8) -

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this page of javascript drop-down menu , there arrows beside menu content when viewing chrome , firefox. http://code.stephenmorley.org/javascript/touch-friendly-drop-down-menus/

however, cannot see arrows when using ie8.

is problem of ie version? what mechanism of arrows? (it seems not images or characters in special font.)

enter image description here


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