<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Image‑Preview Feature Demo</title>
<!-- 1️⃣ CSS – include it in <head> (or link an external file) -->
<style>
/* --- CSS START --- */
/* Basic reset for the demo */
*, *::before, *::after box-sizing: border-box; margin:0; padding:0;
body
font-family: system-ui, sans-serif;
background: #f5f5f5;
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
/* Container for the thumbnail */
.img-preview
position: relative;
max-width: 90vw; /* keep it inside the viewport */
max-height: 80vh;
cursor: zoom-in;
overflow: hidden;
border-radius: 8px;
box-shadow: 0 4px 12px rgba(0,0,0,.15);
.img-preview img
width: 100%;
height: auto;
display: block;
transition: transform .3s ease;
.img-preview:hover img
transform: scale(1.02);
/* Light‑box overlay */
.lightbox
position: fixed;
inset: 0;
background: rgba(0,0,0,.85);
display: none; /* hidden by default */
justify-content: center;
align-items: center;
z-index: 9999;
opacity: 0;
transition: opacity .3s ease;
.lightbox.open
display: flex;
opacity: 1;
.lightbox img
max-width: 95vw;
max-height: 95vh;
border-radius: 8px;
animation: zoomIn .3s ease forwards;
@keyframes zoomIn
from transform: scale(.8); opacity:0;
to transform: scale(1); opacity:1;
.lightbox .close
position: absolute;
top: 1.2rem;
right: 1.2rem;
font-size: 2rem;
color: #fff;
cursor: pointer;
background: transparent;
border: none;
/* Simple placeholder when image fails */
.img-preview .placeholder
display: flex;
align-items: center;
justify-content: center;
background: #e0e0e0;
color: #555;
font-size: 1rem;
width: 100%;
height: 100%;
/* --- CSS END --- */
</style>
</head>
<body>
<!-- 2️⃣ MARKUP -->
<div class="img-preview" tabindex="0">
<!-- Lazy‑load attribute is supported by all modern browsers -->
<img src="https://www.zupimages.net/up/23/07/n9top"
loading="lazy"
alt="Demo image – replace with your own"
onerror="this.style.display='none'; this.parentNode.appendChild(document.createElement('div')).className='placeholder'; this.parentNode.lastChild.textContent='Image unavailable';">
<!-- Optional caption -->
<figcaption style="position:absolute;bottom:0;left:0;right:0;background:rgba(0,0,0,.5);color:#fff;padding:.4rem;text-align:center;font-size:.9rem;">
Click to enlarge
</figcaption>
</div>
<!-- Light‑box container (hidden until opened) -->
<div class="lightbox" id="lb">
<button class="close" aria-label="Close lightbox">×</button>
<img src="https://www.zupimages.net/up/23/07/n9top"
alt="Full‑size preview">
</div>
<!-- 3️⃣ JavaScript – make it interactive -->
<script>
// --- JS START ---
(function ()
const preview = document.querySelector('.img-preview');
const lightbox = document.getElementById('lb');
const lbImg = lightbox.querySelector('img');
const closeBtn = lightbox.querySelector('.close');
// Open the lightbox
function openLightbox()
lightbox.classList.add('open');
// Prevent background scroll while the overlay is open
document.body.style.overflow = 'hidden';
// Close the lightbox
function closeLightbox()
lightbox.classList.remove('open');
document.body.style.overflow = '';
// Click on thumbnail → open
preview.addEventListener('click', openLightbox);
// Keyboard: ENTER on the focused thumbnail opens it
preview.addEventListener('keydown', e => e.key === ' ') openLightbox();
);
// Click on × or outside the image → close
closeBtn.addEventListener('click', closeLightbox);
lightbox.addEventListener('click', e =>
if (e.target === lightbox) closeLightbox();
);
// ESC key closes the overlay
document.addEventListener('keydown', e =>
if (e.key === 'Escape' && lightbox.classList.contains('open'))
closeLightbox();
);
)();
// --- JS END ---
</script>
</body>
</html>
If your real goal is to write an article about using img src with ZupImages, here is a long-form, SEO-friendly article based on that theme.
The img src attribute defines the path to the image you want to display on a web page. It can be:
Without a valid src, no image appears — only an empty box or an alt text.
ZupImages is a free, no-registration-required image hosting service launched in 2016. It allows users to upload images and receive direct links, BBCodes, and HTML codes for forums, blogs, or websites. Key features:
If you need to change the image source dynamically:
document.getElementById("myImage").src = "https://www.zupimages.net/up/23/07/n9top.jpg";
Or build the URL based on variables:
let year = "23";
let month = "07";
let code = "n9top";
let imgSrc = `https://www.zupimages.net/up/$year/$month/$code.jpg`;