The only JavaScript, you need is :
fetch('components/navbar.html')
.then(response => response.text())
.then(data => document.getElementById('navbar').innerHTML = data)
.catch(error => console.error('Error loading navbar:', error));
fetch('components/footer.html')
.then(response => response.text())
.then(data => document.getElementById('footer').innerHTML = data)
.catch(error => console.error('Error loading footer:', error));
function toggleTheme() {
const body = document.body;
const sunIcon = document.querySelector('.icon-sun');
const moonIcon = document.querySelector('.icon-moon');
body.classList.toggle('dark');
sunIcon.classList.toggle('hidden', body.classList.contains('dark'));
moonIcon.classList.toggle('hidden', !body.classList.contains('dark'));
if (document.startViewTransition) {
document.startViewTransition(() => {
console.log("View Transition Applied");
});
}
}
So, let's start with css for Toggle Theme
Now, thing we're going to try is circle object with css

::view-transition-new(root) {
mask: url('data:image/svg+xml,')
center / 0 no-repeat;
animation: scale 1s;
}
::view-transition-old(root),
.dark::view-transition-old(root) {
animation: none;
z-index: -1;
}
.dark::view-transition-new(root) {
animation: scale 1s;
}
@keyframes scale {
to {
mask-size: 200vmax;
}
}
Now, thing we're going to try is circle object initiating from left top.

::view-transition-group(root) {
animation-timing-function: var(--expo-out);
}
::view-transition-new(root) {
mask: url('data:image/svg+xml,') top left / 0 no-repeat;
mask-origin: content-box;
animation: scale 1s;
transform-origin: top left;
}
::view-transition-old(root),
.dark::view-transition-old(root) {
animation: scale 1s;
transform-origin: top left;
z-index: -1;
}
@keyframes scale {
to {
mask-size: 350vmax;
}
}
Now, getting a pan screen using clip paths.

::view-transition-group(root) {
animation-duration: 0.7s;
animation-timing-function: var(--expo-out);
}
::view-transition-new(root) {
animation-name: reveal-light;
}
::view-transition-old(root),
.dark::view-transition-old(root) {
animation: none;
z-index: -1;
}
.dark::view-transition-new(root) {
animation-name: reveal-dark;
}
@keyframes reveal-dark {
from {
clip-path: polygon(50% -71%, -50% 71%, -50% 71%, 50% -71%);
}
to {
clip-path: polygon(50% -71%, -50% 71%, 50% 171%, 171% 50%);
}
}
@keyframes reveal-light {
from {
clip-path: polygon(171% 50%, 50% 171%, 50% 171%, 171% 50%);
}
to {
clip-path: polygon(171% 50%, 50% 171%, -50% 71%, 50% -71%);
}
}
Here's, to the crazy ones.
Now, let's level up with adding a gif overlay.

::view-transition-group(root) {
animation-timing-function: var(--expo-in);
}
::view-transition-new(root) {
mask: url('https://media.tenor.com/cyORI7kwShQAAAAi/shigure-ui-dance.gif') center / 0 no-repeat;
animation: scale 3s;
}
::view-transition-old(root),
.dark::view-transition-old(root) {
animation: scale 3s;
}
@keyframes scale {
0% {
mask-size: 0;
}
10% {
mask-size: 50vmax;
}
90% {
mask-size: 50vmax;
}
100% {
mask-size: 2000vmax;
}
}
Guess, who this one is?

::view-transition-group(root) {
animation-timing-function: var(--expo-in);
}
::view-transition-new(root) {
mask: url('https://media.tenor.com/Jz0aSpk9VIQAAAAi/i-love-you-love.gif') center / 0 no-repeat;
animation: scale 1.5s;
}
::view-transition-old(root),
.dark::view-transition-old(root) {
animation: scale 1.5s;
}
@keyframes scale {
0% {
mask-size: 0;
}
10% {
mask-size: 50vmax;
}
90% {
mask-size: 50vmax;
}
100% {
mask-size: 2000vmax;
}
}
These are two animating functions, I used.
:root {
--expo-in: linear(
0 0%, 0.0085 31.26%, 0.0167 40.94%,
0.0289 48.86%, 0.0471 55.92%,
0.0717 61.99%, 0.1038 67.32%,
0.1443 72.07%, 0.1989 76.7%,
0.2659 80.89%, 0.3465 84.71%,
0.4419 88.22%, 0.554 91.48%,
0.6835 94.51%, 0.8316 97.34%, 1 100%
);
--expo-out: linear(
0 0%, 0.1684 2.66%, 0.3165 5.49%,
0.446 8.52%, 0.5581 11.78%,
0.6535 15.29%, 0.7341 19.11%,
0.8011 23.3%, 0.8557 27.93%,
0.8962 32.68%, 0.9283 38.01%,
0.9529 44.08%, 0.9711 51.14%,
0.9833 59.06%, 0.9915 68.74%, 1 100%
);
}