wpt/css/css-flexbox/position-relative-stretch-height-001.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<title>CSS Flexbox: relative position percentage top with height: stretch containing block</title>
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#definite-sizes">
<link rel="help" href="https://drafts.csswg.org/css-position-3/#valdef-top-percentage">
<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#stretch-fit-sizing">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body {
    margin: 0;
}

.green {
    width: 20px;
    height: 20px;
    background: green;
    position: relative;
}
</style>

<!-- 1. height: stretch against definite parent -->
<div style="height: 200px;">
    <div id="t1-item" style="height: stretch;">
        <div class="green" id="t1" style="top: 50%;"></div>
    </div>
</div>

<!-- 2. height: stretch against auto parent (indefinite) -->
<div>
    <div id="t2-item" style="height: stretch;">
        <div class="green" id="t2" style="top: 50%;"></div>
    </div>
</div>

<!-- 3. height: stretch inside stretched flex item (definite per 9.8) -->
<div style="display: flex; height: 200px;">
    <div>
        <div id="t3-item" style="height: stretch;">
            <div class="green" id="t3" style="top: 50%;"></div>
        </div>
    </div>
</div>

<!-- 4. height: stretch inside auto-height column flex item (indefinite) -->
<div style="display: flex; flex-direction: column;">
    <div style="flex-grow: 1;">
        <div id="t4-item" style="height: stretch;">
            <div class="green" id="t4" style="top: 50%;"></div>
        </div>
    </div>
</div>

<script>
function offsetFromItem(greenId, itemId) {
    var green = document.getElementById(greenId);
    var item = document.getElementById(itemId);
    return green.getBoundingClientRect().top - item.getBoundingClientRect().top;
}

test(function() {
    assert_equals(offsetFromItem('t1', 't1-item'), 100);
}, 'height: stretch against definite parent, top: 50%');

test(function() {
    assert_equals(offsetFromItem('t2', 't2-item'), 0);
}, 'height: stretch against auto parent, top: 50%');

test(function() {
    assert_equals(offsetFromItem('t3', 't3-item'), 100);
}, 'height: stretch inside stretched flex item, top: 50%');

test(function() {
    assert_equals(offsetFromItem('t4', 't4-item'), 0);
}, 'height: stretch inside auto-height column flex item, top: 50%');
</script>