How change content value of pseudo :before element by Javascript

Question

I have the grap constructured by CSS, which is dynamically changes by JS. I show graph max value by pseudo element as:

.graph:before {
    content:\"\"; //va         


        

Answer 1

You can use document.styleSheets to modify pseudo selector cssRules

document.styleSheets[0].cssRules[0].style.content = '"111"';