html:
i am not sure about placeHolder attribute for input support in ie10,but if u want a placeholder in ie u can do this throug jquery like this below..
if(navigator.appVersion.match(/MSIE [\d.]+/)){
var placeholderText = 'Some Placeholder Text';
$('#loginname').val(placeholderText);
$('#loginname').blur(function(){
$(this).val() == '' ? $(this).val(placeholderText) : false;
});
$('#loginname').focus(function(){
$(this).val() == placeholderText ? $(this).val('') : false;
});
}
u can do same for password too..
Have U tried somewhat like this using code...i believe should work...
$('#loginname').attr('placeholder', 'username');
$('#password').attr('placeholder', 'password');