<!DOCTYPE html>
<html class="reftest-wait">
<meta charset="utf-8">
<title>Fractional scroll area position / size</title>
<style>
body {
margin: 0;
}
#scrollbox {
width: 200px;
overflow: hidden;
background: red;
}
#scrolled-content {
background: lime;
box-sizing: border-box;
border: solid black;
border-width: 1px 0;
}
</style>
<div id="scrollbox">
<div id="scrolled-content"></div>
</div>
<script>
function getFloatQueryParams(defaultValues) {
let result = Object.assign({}, defaultValues);
for (let chunk of location.search.substr(1).split("&")) {
let parts = chunk.split("=");
result[parts[0]] = parseFloat(parts[1]);
}
return result;
}
let params = getFloatQueryParams({
top: 0,
outerBottom: 100,
innerBottom: 100,
borderTop: 0,
borderBottom: 0,
scrollBefore: 0,
scrollAfter: undefined,
offsetAfter: undefined,
});
let scrollArea = document.getElementById("scrollbox");
let scrolledContent = document.getElementById("scrolled-content");
scrollArea.style.marginTop = params.top + "px";
scrollArea.style.height = (params.outerBottom - params.top) + "px";
scrolledContent.style.height = (params.innerBottom - params.top) + "px";
scrollArea.scrollTop = 1;
scrollArea.scrollTop = 2;
scrollArea.scrollTop = params.scrollBefore;
window.addEventListener("MozReftestInvalidate", function () {
if (params.scrollAfter !== undefined) {
scrollArea.scrollTop = params.scrollAfter;
}
if (params.offsetAfter !== undefined) {
document.body.style.marginTop = params.offsetAfter + "px";
}
document.documentElement.className = "";
});
</script>