add Attributes JavaScript

Question

How can i add to all elements with the className "digit" the attribute r="2.5px"?

-> https://code.sololearn.com/W27JVf29KuFV/#html <-

Answer 1

sorry i made a mistake that's why i remove first answer
check this:
https://code.sololearn.com/WjlRGHz2GYce/#html

Answer 2

That worked:
window.onload = function (){
var digits= document.getElementsByClassName("digit");
for (i = 0; i<digits.length; i++)
digits[i].style.r = "2.5px";

}

Answer 3

Thank you both 😀 you helped really much