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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <h1>이미지의 가로세로비를 유지하면서 틀 안에 맞추기</h1>

<h2>세로로 긴 이미지 맞추기</h2>
<ul class="clearfix">
  <li>
    <p>1:1 비율</p>
    <div class="aspect_1_1"><img src="http://dimg.donga.com/wps/NEWS/IMAGE/2014/02/26/61229543.2.jpg"></div>
  </li>
  <li>
    <p>4:3 비율</p>
    <div class="aspect_4_3"><img src="http://dimg.donga.com/wps/NEWS/IMAGE/2014/02/26/61229543.2.jpg"></div>
  </li>
  <li>
    <p>4:5 비율</p>
    <div class="aspect_4_5"><img src="http://dimg.donga.com/wps/NEWS/IMAGE/2014/02/26/61229543.2.jpg"></div>
  </li>
  <li>
    <button id="btnToggleOverflow" type="button">이미지 자름 토글</button>
  </li>
</ul>

<br><br>
<h2>가로로 긴 이미지 맞추기</h2>
<ul class="clearfix">
  <li>
    <p>1:1 비율</p>
    <div class="aspect_1_1"><img src="http://dimg.donga.com/wps/NEWS/IMAGE/2014/02/21/61082243.3.jpg"></div>
  </li>
  <li>
    <p>4:3 비율</p>
    <div class="aspect_4_3"><img src="http://dimg.donga.com/wps/NEWS/IMAGE/2014/02/21/61082243.3.jpg"></div>
  </li>
  <li>
    <p>4:5 비율</p>
    <div class="aspect_4_5"><img src="http://dimg.donga.com/wps/NEWS/IMAGE/2014/02/21/61082243.3.jpg"></div>
  </li>
</ul>

<div class="footer">
<a href="https://start.goodtime.co.kr/2014/02/%EC%9D%B4%EB%AF%B8%EC%A7%80%EC%9D%98-%EA%B0%80%EB%A1%9C%EC%84%B8%EB%A1%9C%EB%B9%84%EB%A5%BC-%EC%9C%A0%EC%A7%80%ED%95%98%EB%A9%B4%EC%84%9C-%ED%8B%80-%EC%95%88%EC%97%90-%EB%A7%9E%EC%B6%94%EB%A0%A4/" target="_blank">2014, 이동련</a></div>
            
          
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CSS

            
              body, button { font-family: 맑은 고딕; font-size: 11pt; text-decoration: none; }

li { float: left; margin-right: 50px; list-style: none; }
li > div { border: solid 3px blue; }

/* 아래 세 줄이 중요한 스타일임 */
div.aspect_1_1 { width: 80px; height: 80px; }
div.aspect_4_3 { width: 100px; height: 75px; }
div.aspect_4_5 { width: 80px; height: 100px; }

.clearfix:after {
   content: " ";
   visibility: hidden;
   display: block;
   height: 0;
   clear: both;
}
.footer {
  width: 600px; text-align: center; margin-top: 5em;
}
            
          
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JS

            
              window.onload = function() {
  var divs = document.querySelectorAll('li > div');
  for (var i = 0; i < divs.length; ++i) {
    var div = divs[i];
    var divAspect = div.offsetHeight / div.offsetWidth;
    div.style.overflow = 'hidden';
    
    var img = div.querySelector('img');
    var imgAspect = img.height / img.width;

    if (imgAspect <= divAspect) {
      // 이미지가 div보다 납작한 경우 세로를 div에 맞추고 가로는 잘라낸다
      var imgWidthActual = div.offsetHeight / imgAspect;
      var imgWidthToBe = div.offsetHeight / divAspect;
      var marginLeft = -Math.round((imgWidthActual - imgWidthToBe) / 2)
      img.style.cssText = 'width: auto; height: 100%; margin-left: '
                      + marginLeft + 'px;'
    } else {
      // 이미지가 div보다 길쭉한 경우 가로를 div에 맞추고 세로를 잘라낸다
      img.style.cssText = 'width: 100%; height: auto; margin-left: 0;';
    }
  }
  
  var btn = document.querySelector('#btnToggleOverflow');
  btn.onclick = function() {
    var val = divs[0].style.overflow == 'hidden' ? 'visible' : 'hidden';
    for (var i = 0; i < divs.length; ++i)
      divs[i].style.overflow = val;
  };
};

            
          
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999px

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