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Test Info:

<!doctype html>
<meta charset=utf-8>
<meta name="viewport" content="width=device-width">
<link rel="match" href="position-fixed-dynamic-transformed-sibling-ref.html">
<link rel="help" href="https://bugzil.la/1797703">
<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org" title="Mozilla">
<style>
body {
margin: 0;
}
.spacer {
height: 100px;
}
.transformed {
transform: translateX(0);
}
.fixed {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 50px;
background-color: blue;
}
#target {
position: relative;
}
</style>
<div class="spacer"></div>
<div id="target" style="display: none">
<div class="transformed"></div>
<div class="fixed"></div>
</div>
<script>
let target = document.getElementById("target");
document.body.getBoundingClientRect();
target.style.display = "";
</script>