jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.
jsperf.com URLs are mirrored at the same path, e.g:
https://jsperf.com/negative-modulo/2
Can be accessed at:
https://jsperf.app/negative-modulo/2
<div style="position:relative;padding:20px;margin-top:12px">
<div style="position:relative;padding:20px;margin-top:12px">
<div id="mydiv">
test
<div>
</div>
</div>var cache = {
offsetTop: [],
offsetLeft: []
}
function fullOffsetCached(offsetName, elem) {
if (cache[offsetName][elem]) {
return cache[offsetName][elem];
}
var offset = elem[offsetName];
var parent = elem;
while (parent = parent.offsetParent) {
offset += fullOffsetCached(offsetName, parent);
}
cache[offsetName][elem] = offset;
return offset;
}
function fullOffset(offsetName, elm) {
var offset = elm[offsetName];
while (elm = elm.offsetParent) {
offset = offset + elm[offsetName];
}
return offset;
}
function bothOffset(elem) {
var offsetLeft = elem.offsetLeft,
offsetTop = elem.offsetTop;
while (elem = elem.offsetParent) {
offsetLeft += elem.offsetLeft;
offsetTop += elem.offsetTop;
}
return {
left: offsetLeft,
top: offsetTop
};
}
var boundingOffset = function(elem) {
var rect = elem.getBoundingClientRect();
return {
top: rect.top + document.documentElement.scrollTop,
left: rect.left + document.documentElement.scrollLeft
};
};
var boundingOffsetDoc = function(elem) {
var rect = elem.getBoundingClientRect();
var doc = document.documentElement;
return {
top: rect.top + doc.scrollTop,
left: rect.left + doc.scrollLeft
};
};
var mydiv = document.getElementById('mydiv')Ready to run.
| Test | Ops/sec | |
|---|---|---|
| offset top cached | | ready |
| getBoundingClientRect | | ready |
| bothOffset | | ready |
| bounding + scroll | | ready |
| bounding + scroll (cache doc) | | ready |
| offset function | | ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.