script.js

const name = document.getElementById('name')
const password = document.getElementById('password')
const form = document.getElementById('form')
const errorElement = document.getElementById('error')

form.addEventListener('submit', (e)=>{
    let messages=[];
    if(password.value.length<=6){
        messages.push('Password must be longer than 6 characters.')
    }
    if(password.value.length>=20){
        messages.push('Password must be shorter than 20 characters.')
    }
    if(password.value==='password'){
        messages.push('Password cannot be password.')
    }
    if(messages.length>0){
        e.preventDefault()
        errorElement.innerText=messages.join(', ');
    }
})