JSFiddle - React, Tailwind, and code Playground

JavaScript

var key = 'aaaaaaaaaaaaaaaa'
var iv = 'bbbbbbbbbbbbbbbb';
var ciphertext = '10f42fd95857ed2775cfbc4b471bc213';

function hex2ab(hex){
    return new Uint8Array(hex.match(/[\da-f]{2}/gi).map(function (h) {return parseInt(h, 16)}));
}

key = new TextEncoder().encode(key);
iv = new TextEncoder().encode(iv);
ciphertext = hex2ab(ciphertext);

window.crypto.subtle.importKey(
    'raw',
    key,
    {
        name: 'AES-CBC'
    },
    true, // can the key be extracted using SubtleCrypto.exportKey() / SubtleCrypto.wrapKey()?
    ['decrypt'] // keyUsages
).then(function(key) {
    window.crypto.subtle.decrypt(
        {
            name: "AES-CBC",
            iv: iv
        },
        key,
        ciphertext
    ).then(function(plaintext) {
        console.log(new TextDecoder().decode(plaintext));
    })
});