JSFiddle - React, Tailwind, and code Playground

HTML

<template name="addVote">
    <div class="form-row choices">
        <label><input type="radio" name="vote" value="Yes"><i></i><span>Yes</span></label>
        <label><input type="radio" name="vote" value="No"><i></i><span>No</span></label>
        <label><input type="radio" name="vote" value="Undecided"><i></i><span>I’m Undecided</span></label>
    </div>
    <div class="form-row">
        <button class="button-submit">Submit and view results</button>
    </div>
</template>

JavaScript

if (localStorage.vote) {
        localStorage.vote = localStorage.vote;
        //user has already cast a vote, reflect this
        document.querySelector(".form-row").querySelector("input[value='"+localStorage.vote+"']").setAttribute("checked", true);
        //disable the submit
        document.querySelector(".button-submit").setAttribute("disabled", true);
    } 

    function setLocalStorageVote()
    {
         //call when user has cast the vote.
         localStorage.vote = document.querySelector(".form-row").querySelector("input[type='radio']:checked").value;
    }


 document.querySelector(".button-submit").onclick = setLocalStorageVote; //using onclick here just for demonstrating purposes. Use addEventListener in production code!