Function addUpUntilIndex

code/styling/public/app.js:20255–20262

(sizes, index)

/* add up all numbers in array up until and including the index */
var addUpUntilIndex = function addUpUntilIndex(sizes, index) {
  var totalUpToIndex = 0;
  for (var i = 0; i <= index; i += 1) {
    totalUpToIndex += sizes[i];
  }

  return totalUpToIndex;
};

/* create a new style tag after lastEl */
var makeStyleTag = function makeStyleTag(target, tagEl, insertBefore) {