Properties for the flexbox container

HTML
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<div class="principal">
<h2>Properties for the flex container</h2
    >
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CSS
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/*flex-direction: row | row-reverse |
    column | column-reverse;*/
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JAVASCRIPT
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function changeFlex(e, t) {
for (var n = document.querySelectorAll("
      ." + e), l = document.querySelector
      ("#" + t), r = 0; r < n.length; r++)
      n[r].addEventListener("change",
      function() {
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