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Test Info:

<!DOCTYPE html>
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script src='/resources/check-layout-th.js'></script>
<link rel="author" title="David Grogan" href="dgrogan@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-box-3/#padding-physical" title="Percentages line">
<meta name="assert" content="item's padding is resolved against parent's size, not item's" />
<style>
x-flexbox {
display: flex;
height: 50px;
width: 500px;
}
x-item {
padding-left: 10%;
background: blue;
position: relative; /* Just so offsetLeft returns distance between x-item and div */
}
div {
height: 50px;
width: 50px;
background: orange;
}
</style>
If the item's % padding is calculated correctly, there is a blue square on the left and an orange square on the right, both 50x50.
<x-flexbox>
<x-item>
<div data-offset-x=50></div>
</x-item>
</x-flexbox>
<script>
checkLayout('x-flexbox');
</script>