XHTML incompatible

[bad-blue-bull]

tried to run it with htmlmin -p img link --keep-optional-attribute-quotes file.xhtml file_minified.xhtml but I get error because still <link href="style.css" type="text/css" rel="stylesheet" /> gets converted to <link href="style.css" type="text/css" rel="stylesheet"> and <img src="image.gif" alt="" /> to <img src="image.gif" alt>