jQuery 1.9.1 prop() in IE8

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<textarea required=""></textarea>

$('textarea').prop('required', true); => <textarea required="true"></textarea>

$('textarea').prop('required', false); => <textarea required="false"></textarea>

$('textarea').prop('required', null); => <textarea required="null"></textarea>

:(

[anonymous]

also IE6, IE7, IE8, IE9(maybe)

[Timmy Willison]

IE8 treats attributes and properties as the same thing. What you're seeing is an issue with IE8, not jQuery. Also, keep in mind that required is a boolean property with only two valid values: true and false, which is not related to the value of the attribute required.