<!DOCTYPE html>
<!--
 | The directionality of an element is inherited from its parent element if it
 | is not explicitly set on the element itself. The parent does not have its
 | directionality impacted by its children.
 |   https://www.w3.org/TR/html50/dom.html#the-directionality
 -->
<html>
<head>
  <meta charset="utf-8">
  <style>
    body {
      margin: 0px;
      font-family: Roboto, Noto Naskh Arabic UI;
      font-size: 30px;
      color: #fff;
    }
    .containing-block {
      background-color: #03a9f4;
      width: 200px;
    }
  </style>
</head>
<body>
  <div class="containing-block">
    <div dir="rtl">test<div dir="ltr">32.ما اسمك؟</div> Thanks.</div>
    <div dir="ltr">test<div dir="rtl">32.ما اسمك؟</div> Thanks.</div>
  </div>
</body>
</html>