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body { overflow-x: scroll }
div {
width: 10px;
height: 10px;
background-color: #d64203;
<div style="width: 50px"></div> <!-- Unaffected by scrollbars. -->
<div id="b"></div>
<div style="width: 35px"></div> <!-- Unaffected by scrollbars. -->
<div id="d"></div>
<!-- Deliberately make scrollbars appear. -->
<div style="width: 500px; height: 500px; background-color: black">
// client{Width, Height} consist of the area _inside_ the scrollbars, so these
// manually calculated units reflect the fact that with 'overflow: scroll' set,
// viewport units are sized taking the scrollbars into account. Since we're
// only dealing with 'overflow-x' here, only the height units are affected.
var vh = 0.01 * document.body.clientHeight;
document.getElementById('b').style.height = (25 * vh) + "px";
document.getElementById('d').style.height = (25 * vh) + "px";