File: slot-element-default-display.html

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<!DOCTYPE html>
<title>CSS Test (Display): <slot> elements default display should be contents</title>
<link rel="help" href="https://html.spec.whatwg.org/multipage/rendering.html#flow-content-3">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<body>

<script>
    test(() => {
        let host = document.body.appendChild(document.createElement("div"));
        let slot = host.attachShadow({ mode: "open" }).appendChild(document.createElement("slot"));
        let cs = getComputedStyle(slot);
        assert_equals(cs.getPropertyValue("display"), "contents", "slot default display is not contents");
        document.body.removeChild(host);
    }, `slot element with default display should be contents`);

</script>