css/css-text/shaping/shaping-005.html

<!DOCTYPE html>
<html  lang="en" >
<head>
<meta charset="utf-8">
<title>shaping: padding 0</title>
<meta name="assert" content="Shaping must not be broken across inline box boundaries when padding is set to 0.">
<link rel="author" title="Richard Ishida" href="mailto:ishida@w3.org">
<link rel="help" href="https://drafts.csswg.org/css-text/#boundary-shaping">
<link rel="match" href="reference/shaping-000-ref.html">
<style type="text/css">
@font-face {
    font-family: 'csstest_noto';
    src: url('/fonts/noto/NotoNaskhArabic-regular.woff2') format('woff2');
    }
.test, .ref { border: 1px solid #02D7F6;  margin: 20px;  padding: 10px; width: 3em; font-size: 120px; font-family: "csstest_noto"; }
/* the CSS above is not part of the test */
.padding { padding:0; }
</style>
</head>
<body>
<p class="instructions">Test passes if the three Arabic characters in each box join, making the two boxes identical.</p>

<div class="test" lang="ar" dir="rtl">ع<span class="padding">ع</span>ع</div>
<div class="ref" lang="ar" dir="rtl">ع&zwj;<span class="padding">&zwj;ع&zwj;</span>&zwj;ع</div>
<!-- Notes:
This test uses the Noto Naskh Arabic font to control variables related to font choice.
-->
</body>
</html>