<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style type="text/css">
p { margin: 5px 1em; line-height: 1.5; width: 0; }
</style>
</head>
<body>
<div style="float:left; width: 15em;">
<!-- U+FEFF is (deprecated) ZERO-WIDTH NO-BREAK SPACE -->
<p>abcdefabcdef</p>
<p>abcdef)(abcdef</p>
<p>abcdef abcdef</p>
<p>abcdef abcdef</p>
<p>abcdefabcdef</p>
<p>コミュニ</p>
<p>コミュニ</p>
<p>你好吗？</p>
<p>你好吗？</p>
<p>你好吗？</p>
</div>
<div style="float:left; width: 15em;">
<!-- U+2060 is WORD JOINER -->
<p>abcdef⁠abcdef</p>
<p>abcdef)⁠(abcdef</p>
<p>abcdef ⁠abcdef</p>
<p>abcdef⁠ abcdef</p>
<p>abcdef⁠⁠⁠abcdef</p>
<p>コミュニ</p>
<p>コ⁠ミ⁠ュ⁠ニ</p>
<p>你好吗？</p>
<p>你⁠好吗？</p>
<p>你⁠好⁠吗？</p>
</div>
</body>
</html>