The flex-shrink property sets the flex shrink factor to the provided number.
object.style.flexShrink = "value";
<'flex-shrink'> = <number [0,∞]>
<number [0, ∞]>
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 positive sign (+). The last character may be succeeded by an exponent (e or E) and an integer.
World Wide Web Consortium (W3C)