'이미지가 사용자에게 내용을 이해하는데 도움을 준다면 <img>태그를 사용하고 그렇지 않으면 background image를 사용하면 된다.'
[ 원문 ] If you need to choose between using an HTML <img> tag or a CSS background-image – just ask yourself a question: does this image help people in understanding my content better? If the answer is yes – use img tag. If – no – set it as a background image. After all – if both ways can provide you with the same visual result – you just need to define what has more sense in your situation.