In my simple test, I didn’t have to set anything, and the default behavior was evenly broken. Of course, real content can push you, so you can help css and html.
<html>
<head>
<style type="text/css">
td{border:1px solid #000; padding:1px;}
</style>
</head>
<body>
<table width="300px">
<tr><td width="50px"></td><td width="30px"></td><td width="50px"></td><td></td><td></td></tr>
</table>
</body>
</html>
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