<!DOCTYPE html>
<html>
<head>
<title>Заголовок документа</title>
<style>
.tab1 {
-moz-tab-size: 5; /* Firefox */
-o-tab-size: 5; /* Opera 10.6-12.1 */
tab-size: 5;
}
.tab2 {
-moz-tab-size: 20; /* Firefox */
-o-tab-size: 20; /* Opera 10.6-12.1 */
tab-size: 20;
}
</style>
</head>
<body>
<h2>Пример свойства tab-size</h2>
<pre class="tab1">
Lorem ipsum is a...
</pre>
<pre class="tab2">
Lorem ipsum is a...
</pre>
</body>
</html>