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HTML

              
                <div id="test">
  <p>Try changing the font size in the CSS panel and make a minor edit in this panel (e.g., add an extra space somewhere) to update the results below.</p>
  <p id="target">Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
  <p>Regardless of the font size, the middle paragraph should always be truncated to the number of lines in the second parameter passed to limitLines().</p>
</div>
              
            
!

CSS

              
                #test {
  width: 320px;
  font-size: 18px;
}
              
            
!

JS

              
                // @param 1 = element containing text to truncate
// @param 2 = the maximum number of lines to show
function limitLines(el, nLines) {
  var nHeight,
    el2 = el.cloneNode(true);
  // Create clone to determine line height
  el2.style.position = 'absolute';
  el2.style.top = '0';
  el2.style.width = '10%';
  el2.style.overflow = 'hidden';
  el2.style.visibility = 'hidden';
  el2.style.whiteSpace = 'nowrap';
  el.parentNode.appendChild(el2);
  nHeight = (el2.clientHeight+2)*nLines; // Add 2 pixels of slack
  // Clean up
  el.parentNode.removeChild(el2);
  el2 = null;
  // Truncate until desired nLines reached
  if (el.clientHeight > nHeight) {
    var i = 0,
      imax = nLines * 35;
    while (el.clientHeight > nHeight) {
      el.innerHTML = el.textContent.slice(0, -2) + '&hellip;';
      ++i;
      // Prevent infinite loop in "print" media query caused by
      // Bootstrap CSS: a[href]:after { content:" (" attr(href) ")"; }
      if (i === imax) break;
    }
  }
}

limitLines(document.getElementById('target'), 7);
              
            
!
999px

Console