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<!doctype html>
<meta charset="utf-8">
<title>Test InspectorUtils.containingBlockOf</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<style>
#positioned-grid {
display: grid;
position: relative;
}
.abs {
position: absolute;
}
.fixed {
position: fixed;
}
</style>
<div id="positioned-grid">
<div class="item">
<div class="abs"></div>
<div class="fixed"></div>
</div>
</div>
<script>
const InspectorUtils = SpecialPowers.InspectorUtils;
const abs = document.querySelector(".abs");
const fixed = document.querySelector(".fixed");
const grid = document.querySelector("#positioned-grid");
is(InspectorUtils.containingBlockOf(fixed), null, "CB of fixed pos is the viewport");
is(SpecialPowers.unwrap(InspectorUtils.containingBlockOf(abs)), grid, "CB of abspos is the grid container");
const item = document.querySelector(".item");
item.style.willChange = "transform";
is(SpecialPowers.unwrap(InspectorUtils.containingBlockOf(fixed)), item, "Transformed element is the cb of fixed pos elements");
is(SpecialPowers.unwrap(InspectorUtils.containingBlockOf(abs)), item, "Transformed element is the cb of abspos elements");
</script>
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