Selecting Elements:

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1.getElementById

				
					var element = document.getElementById('elementId');

				
					var elements = document.getElementsByClassName('className');

				
					var elements = document.getElementsByTagName('tagName');

				
					var element = document.querySelector('selector');

				
					element.setAttribute('attributeName', 'attributeValue');

				
					element.classList.add('className');

				
					element.classList.remove('className');