JSFiddle - React, Tailwind, and code Playground

HTML

<form name="form1">
  <span id="buttons">
    <input type="button" name="button1" value="Bay"/>
    <input type="button" name="button2" value="Black"/>
    <input type="button" name="button3" value="Buckskin"/>
</form>

JavaScript

var speed, buttonsDiv=document.getElementById("buttons");

for (var i=1; i<=3; i++) {
  var button = document.form1["button" + i];
  button.onclick = function() {
    speed = this.value;
    document.write(speed);
    
  }
}