(function () {
const selector = '.sd-scroll-text-reveal';
let targets = [];
function init() {
if (window.matchMedia(
'(prefers-reduced-motion: reduce)'
).matches) return;
document.querySelectorAll(selector).forEach(function (widget) {
if (widget.dataset.sdRevealReady) return;
// Animate only the first heading inside this widget
const heading = widget.querySelector(
'h1, h2, h3, h4, h5, h6'
);
if (!heading) return;
heading.classList.add('sd-scrub-heading');
widget.dataset.sdRevealReady = 'true';
targets.push(heading);
});
update();
}
function update() {
const start = window.innerHeight * 0.45;
const end = window.innerHeight * 0.15;
const distance = start - end;
targets.forEach(function (heading) {
const top = heading.getBoundingClientRect().top;
// Progress increases while scrolling down.
// 0 = fully visible, 1 = fully hidden.
const progress = Math.max(
0,
Math.min(1, (start - top) / distance)
);
heading.style.clipPath =
'inset(' + (progress * 100) + '% 0 0 0)';
heading.style.transform =
'translateY(' + (-18 * progress) + 'px)';
});
}
let ticking = false;
function requestUpdate() {
if (ticking) return;
ticking = true;
window.requestAnimationFrame(function () {
update();
ticking = false;
});
}
if (document.readyState === 'loading') {
document.addEventListener('DOMContentLoaded', init);
} else {
init();
}
window.addEventListener('scroll', requestUpdate, {
passive: true
});
window.addEventListener('resize', requestUpdate);
})();
