IE8, IE9, IE10 input control file type setting opacity opacity invalid_html/css_WEB-ITnose

IE8, IE9, IE10 input control file type setting opacity is invalid
There is no problem with IE6, Firefox, Google, and Apple. Please help me find out why the opacity opacity of IE8, IE9, and IE10 has no effect. Woolen cloth?

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Reply to the discussion (solution)

IE8 security issues, if there is no problem locally, if there is an external network, many sensitive settings of the INPUT object are invalid, set the access site Just be a trusted site

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