gecko-dev/layout/reftests/flexbox/flexbox-dyn-changeContent-1...

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HTML

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="UTF-8">
<!-- This testcase ensures that we correctly re-evaluate the percent width on
the purple flex item "itemA", in response to the width of its flex
container changing due to the other item gaining some more content. -->
<style>
#flex {
display: inline-flex;
border: 1px solid black;
}
#itemA {
background: purple;
width: 50%;
flex: none;
}
#itemB {
background: lightblue;
flex: none;
}
</style>
<script>
function tweak() {
document.getElementById("itemB").innerText = "BBBBB";
document.documentElement.removeAttribute("class");
}
window.addEventListener("MozReftestInvalidate", tweak, false);
</script>
</head>
<body>
<div id="flex">
<div id="itemA"></div>
<div id="itemB">BB</div>
</div>
</body>
</html>