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<!doctype html>
<title>Text fragment navigation helper.</title>
<script src="/scroll-to-text-fragment/stash.js"></script>
<script>
function isInView(element) {
let rect = element.getBoundingClientRect();
return rect.top >= 0 && rect.top <= window.innerHeight
&& rect.left >= 0 && rect.left <= window.innerWidth;
}
function checkScroll() {
let position = 'unknown';
if (window.scrollY == 0)
position = 'top';
else if(isInView(document.getElementById("text")))
position = 'text';
else if(isInView(document.getElementById("text2")))
position = 'text2';
else if(isInView(document.getElementById("text3")))
position = 'text3';
const target = document.querySelector(":target");
let results = {
scrollPosition: position,
href: window.location.href,
target: target ? target.id : 'undefined'
};
let key = (new URL(document.location)).searchParams.get("key");
stashResultsThenClose(key, results);
}
function doubleRafCheckScroll() {
requestAnimationFrame(() => {
requestAnimationFrame(() => {
checkScroll();
});
});
}
</script>
<style>
.spacer {
height: 10000px;
}
.auto {
content-visibility: auto;
}
</style>
<body onload="doubleRafCheckScroll()">
<div class=spacer></div>
<div class=auto>
<div id=text>hiddentext</div>
</div>
<div class=spacer></div>
<div id=text2and3ancestor>
<div class=auto>
<div id=text2>start</div>
</div>
<div class=spacer></div>
<div class=auto>
<div id=text3>end</div>
</div>
</div>
</body>
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