JS add custom attributes to elements

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Add custom attributes to elements

obj.setAttribute('attr_name','attr_value'); 
// for example obj.setAttribute('class','snow-container')

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Add to element class Three methods of attribute

document.getElementsByTagName('body')[0].className = 'snow-container'; // Set as new 
document.getElementsByTagName('body')[0].className += 'snow-container'; // Add this after the original 
document.getElementsByTagName('body')[0].classList.add("snow-container"); // Equivalent to the first 

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