Equal height elements. I use it on resize and load events normally.

eqHeight.js

/**
 * Set the height to that of the tallest element for all shared selectors
 * selector      string  querySelectorAll
 * responsive   bool    whether or not to reset height before calculating tallest
 **/
function eqHeight(selector, responsive = true) {
  var findClass = document.querySelectorAll(selector);
  
  // if we don't find any of the elements...back out.
  if (!findClass.length) return;
  
  var tallest = 0;
  var tallestHeight = 0;

  // first we have to find the tallest matching element.
  for (i = 0; i < findClass.length; i++) {
    var ele = findClass[i];
    
    // clear out current height so we can calculate new height.
    if(responsive) {
      ele.style.height = "";
    }      
    var eleHeight = ele.offsetHeight;
    tallest = eleHeight > tallest ? eleHeight : tallest;

    if (ele.classList.contains("anchor")) {
      tallestHeight = eleHeight;
      tallest = tallestHeight;
    }
  }
  console.log('test', tallest);
  // set all elements to tallest height
  for (i = 0; i < findClass.length; i++) {
    findClass[i].style.height = tallest + "px";
  }
}