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var image = document.querySelector('img');

console.log( 'Computed width: ' + getComputedStyle(image).getPropertyValue('width') );
console.log( 'image.width: ' + image.width );
console.log( 'image.naturalWidth: ' + image.naturalWidth );
console.log( 'getAttribute(width): ' + image.getAttribute('width') );
console.log( 'image.getBoundingClientRect().width: ' + image.getBoundingClientRect().width );