$.data can not get value from element when the attr use camelCase

[duwei<duv123@…>]

$(this).data('myID') return undefined but $(this).data('myid') get the value

this is the example:

<input data-myID=2 type="button" onclick="alert($(this).data('myID'));$(this).data('myID',1);alert($(this).data('myID'));alert($(this).data('myid'));" value="click me to alert data-myID">

[dmethvin]

See the HTML5 rules for data- values. Capitalization of attribute names don't matter, it's all lowercased and only letters following a dash (not counting the dash after data) are uppercased.