Запретить выделение текста средствами браузера

HTML

<body unselectable='on' onselectstart='return false; 'onmousedown='return false;'>Запретить выделение текста средствами браузера</body>

body{-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none;user-select:none;-o-user-select:none;}

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