<!DOCTYPE html>
<!--
 | Wrapping is only performed at an allowed break point, called a soft wrap
 | opportunity. In most writing systems, in the absence of hyphenation a soft
 | wrap opportunity occurs only at word boundaries.
 |   https://www.w3.org/TR/css3-text/#soft-wrap-opportunity
 |   https://www.w3.org/TR/css-text-3/#line-break-details
 |
 | When a soft wrap segment is being checked, trailing white space that will be
 | collapsed should not be included when determining if the segment can fit
 | within the available space on the line.
 -->
<html>
<head>
  <style>
    body {
      margin: 0px;
      font-family: Roboto;
      font-size: 20px;
    }
    div {
      overflow-wrap: normal;
    }
    .containing-block {
      background-color: #03a9f4;
      width: 202px;
    }
  </style>
</head>
<body>
  <div class="containing-block">
    <div>abc<span>defg hijklmnopqrst uvwxyz</span></div>
    <div>abc<span>defg hijklmnopqrst </span></div>
    <div><span>abc</span>defg hijklmnopqrst uvwxyz</div>
    <div><span>abc</span>defg hijklmnopqrst </div>
    <div><span><span>abc</span>defg hijklmnopqrst uvwxyz</span></div>
    <div><span><span>abc</span>defg hijklmnopqrst </span></div>
  </div>
</body>
</html>