Replace content with random array item on page load

index.html

 <blockquote id="quoteDisplay"></blockquote>

script.js

const quotes = [
    '<img src="images/abTest38713/UserTestimonial_01@2x.png" width="426" height="76">',
    '<img src="images/abTest38713/UserTestimonial_02@2x.png" width="408" height="76">',
    '<img src="images/abTest38713/UserTestimonial_03@2x.png" width="436" height="76">',
    '<img src="images/abTest38713/UserTestimonial_04@2x.png" width="361" height="77">',
    '<img src="images/abTest38713/UserTestimonial_05@2x.png" width="411" height="76">',
    '<img src="images/abTest38713/UserTestimonial_06@2x.png" width="356" height="76">',
    '<img src="images/abTest38713/UserTestimonial_07@2x.png" width="351" height="76">',
    '<img src="images/abTest38713/UserTestimonial_08@2x.png" width="316" height="76">',
    '<img src="images/abTest38713/UserTestimonial_09@2x.png" width="351" height="76">',
    '<img src="images/abTest38713/UserTestimonial_10@2x.png" width="345" height="76">',
    '<img src="images/abTest38713/UserTestimonial_11@2x.png" width="396" height="76">',
    '<img src="images/abTest38713/UserTestimonial_12@2x.png" width="426" height="76">',
    '<img src="images/abTest38713/UserTestimonial_13@2x.png" width="291" height="76">',
    '<img src="images/abTest38713/UserTestimonial_14@2x.png" width="346" height="77">',
    '<img src="images/abTest38713/UserTestimonial_15@2x.png" width="346" height="76">'
]

window.addEventListener('load', function newQuote() 
{
    let randomNumber = Math.floor(Math.random() * (quotes.length));
    document.getElementById('quoteDisplay').innerHTML = quotes[randomNumber];
    return quotes[randomNumber];
}, false);