The tab-size CSS property determines the tab size used to render preserved tab characters (U+0009).
object.style.tabSize = "value";
<'tab-size'> = <number> | <length>
An integer or zero or more decimal digits followed by a dot (.) followed by one or more decimal digits. The first character may be preceded by a sign (- or +). The last character may be succeeded by an exponent (e or E) and an integer.
Specifies the length using a number followed by a unit of measurement.