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chromium/third_party/blink/web_tests/external/wpt/css/css-text/text-encoding/shaping-tatweel-002.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Text level 3 Test: tatweel and text-shaping, cross font, fallback</title>
<link rel="author" title="Florian Rivoal" href="https://florian.rivoal.net/">
<link rel="help" href="https://drafts.csswg.org/css-text-3/#text-encoding">
<link rel="help" href="https://www.unicode.org/versions/Unicode11.0.0/ch09.pdf">
<link rel="help" href="https://www.w3.org/TR/alreq/#h_joining_enforcement">
<link rel="match" href="reference/shaping-tatweel-002-ref.html">
<meta name="assert" content="Arabic characters next to a U+0640 ARABIC TATWEEL character must take their correct positional form, even if the tatweel comes from a differnt font via font due to font fallback.">
<style>
  table {
    font-size: 3em;
    border-spacing: 0 3px;
  }
  td {
    padding: 0 0.5ch;
    line-height: 1;
    border: 1px solid;
  }
  @font-face {
    font-family: 'primary';
    src: url('/fonts/noto/NotoNaskhArabic-regular.woff2') format('woff2');
    unicode-range: U+20;
  }
  @font-face {
    font-family: 'tatweel';
    src: url('/fonts/Scheherazade-Regular.woff') format('woff');
    unicode-range: U+0640;
  }
  @font-face {
    font-family: 'csstest_noto';
    src: url('/fonts/noto/NotoNaskhArabic-regular.woff2') format('woff2');
  }
  table {
    /*using a primary font with just U+20 (space) to get the baseline right*/
    font-family: 'primary', 'tatweel', 'csstest_noto';
  }
</style>

<p>Test passes if both halves of each of the pairs below are identical:

<table dir=rtl lang=ar>
<tr><!-- alef, final form as it doesn't have a medial form -->
  <td>&#x640;&#x0627;&#x640;
  <td>&#x640;&#xFE8E;&#x640;
<tr><!-- alef, final form -->
  <td>&#x640;&#x0627;
  <td>&#x640;&#xFE8E;
<tr><!-- beh, initial form -->
  <td>&#x0628;&#x640;
  <td>&#xFE91;&#x640;
<tr><!-- beh, medial form -->
  <td>&#x640;&#x0628;&#x640;
  <td>&#x640;&#xFE92;&#x640;
<tr><!-- beh, final form -->
  <td>&#x640;&#x0628;
  <td>&#x640;&#xFE90;
</table>