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<!DOCTYPE html>
<html>
<head>
<link rel="author" title="Sammy Gill" href="mailto:sammy.gill@apple.com">
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#layout-algorithm">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css">
<meta name="assert" content="Tests that the cross size of flexboxes and flex items with % height are computed correctly with various mutations.">
<style>
.flexbox {
display: flex;
font: 10px/1 Ahem;
outline: 1px solid black;
}
.grid {
display: grid;
outline: 1px solid magenta;
}
.flexbox > div {
width: min-content;
outline: 1px solid blue;
}
.percent-height {
min-height: 100%;
}
.fixed-height {
height: 100px;
}
.align-start {
align-items: start;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
function mutateContent() {
document.querySelectorAll("#one, #two, #three").forEach((element) => {
element.innerHTML += " a";
});
document.querySelector("#four").style.width = "auto";
document.querySelector("#five").style.height = "auto";
document.querySelector("#six").style.height = "100px";
document.querySelectorAll("#seven, #eight").forEach((element) => {
element.style.alignItems = "start";
});
}
</script>
</head>
<body>
<!-- Non-percent height flex item is mutated and percent height flex item should be
stretched up. -->
<div class="flexbox test" data-expected-height="40">
<div id="one" class="test" data-expected-height="40">a a a</div>
<div class="percent-height test" data-expected-height="40">a</div>
</div>
<!-- Non-percent height flex item content is mutated and should be stretched to percent
height flex item's size. -->
<div class="flexbox test" data-expected-height="40">
<div id="two" class="min-content percent-height test" data-expected-height="40">a a a</div>
<div class="test" data-expected-height="40">a</div>
</div>
<!-- Percent height flex item content is mutated and increased flexbox's cross axis size. -->
<div class="flexbox test" data-expected-height="30">
<div class="min-content percent-height test" data-expected-height="30">a a a</div>
<div id="three" data-expected-height="30">a</div>
</div>
<!-- Percent height flex item's main axis size changes from min-content to auto which
should result in different cross size. -->
<div class="flexbox test" data-expected-height="10">
<div class="min-content percent-height test" id="four" data-expected-height="10">a a a</div>
</div>
<!-- Flexbox with align-items: flex-start changes from definite to indefinite cross size
which results in different hypothetical cross size for flex item.-->
<div class="flexbox fixed-height align-start test" id="five" data-expected-height="30">
<div class="min-content percent-height test" data-expected-height="30">a a a</div>
<div class="test" data-expected-height="10">a</div>
</div>
<!-- Flexbox with align-items: flex-start changes from indefinite to definite cross size
which results in different hypothetical cross size for the flex item. -->
<div class="flexbox align-start test" id="six" data-expected-height="100">
<div class="min-content percent-height test" data-expected-height="100">a a a</div>
</div>
<!-- Outer flexbox goes from stretching its content to no longer stretching with a
definite cross size. The inner flexbox is no longer stretching which affects the
hypothetical cross axis size of its flex item. -->
<div class="flexbox fixed-height test" id="seven" data-expected-height="100"">
<div class="flexbox align-start test" data-expected-height="30">
<div class="min-content percent-height test" data-expected-height="30">a a a</div>
</div>
</div>
<!-- Grid goes from stretching its content to no longer stretching with a definite cross
size. The flexbox is no longer stretching which affects the hypothetical cross axis
size of tis flex item.-->
<div class="grid fixed-height test" id="eight" data-expected-height="100">
<div class="flexbox align-start test" data-expected-height="30">
<div class="min-content percent-height test" data-expected-height="30">a a a</div>
</div>
</div>
</body>
<script>
document.body.offsetHeight;
mutateContent();
document.body.offsetHeight;
let tests = document.querySelectorAll(".test");
tests.forEach((element) => {
test(function() {
let expectedHeight = element.getAttribute("data-expected-height");
assert_equals(element.offsetHeight, Number(expectedHeight), "height");
});
});
</script>
</html>
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