var myData = document.getElementById('player');

console.log(myData.dataset.name); // "Jose Bautista"

console.log(myData.dataset.type); // "Slugger"

console.log(myData.dataset.team); // "Blue Jays"

console.log(myData.dataset.epicMoment); // "Bat Flip"

​

console.log(myData.dataset);

​

myData.dataset.epicMoment = 'Bat Toss';

​

console.log(myData.dataset.epicMoment); // "Bat Toss"

​

console.log(myData.dataset);