<!DOCTYPE html>
<html>
<title>CSS Flexbox: box-sizing</title>
<link href="support/flexbox.css" rel="stylesheet">
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-flow-property">
<link rel="help" href="https://drafts.csswg.org/css-sizing-3/#box-sizing">
<meta name="assert" content="This test checks the interactions between the flex layout mode and the two possible values for the box-sizing property: border-box and content-box" />

<style>
.flexbox {
    border: 2px solid orange;
}
.h3 {
    