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                #data1 #data1: HTML に独自データ属性を持たない
#data2(data-theme="Custom data attribute") #data2: HTML に独自データ属性を設定する
#data3(data-theme="Custom data attribute") #data3: HTML に独自データ属性を設定する



                body { padding: 1rem; }



                // jQuery v.2.2.4

// #data1 要素に data-xxx 属性 が設定されたわけではないことが確認できる。
console.log('#data1 --------');
$('#data1').data('theme', 'reference');
console.log($('#data1').data('theme')); // reference
$('#data1').data('theme', 'Set data method');
console.log($('#data1').data('theme')); // Set data method
console.log($('#data1').attr('data-theme')); // undifined

// #data2 要素の data-xxx 属性 は data() メソッドで書き換わっていない。
console.log('#data2 --------');
$('#data2').data('theme', 'reference');
console.log($('#data2').data('theme')); // reference
$('#data2').data('theme', 'Set data method');
console.log($('#data2').data('theme')); // Set data method
console.log($('#data2').attr('data-theme')); // Custom data attribute

// #data3 要素の data-xxx 属性 は attr() メソッドで書き換わるが、data は変わっていない。
console.log('#data3 --------');
console.log($('#data3').data('theme')); // Custom data attribute
console.log($('#data3').attr('data-theme')); // Custom data attribute
$('#data3').attr('data-theme', 'Set attr method');
console.log($('#data3').data('theme')); // Custom data attribute
console.log($('#data3').attr('data-theme')); // Set data method