File: resolve-relative-to-base.sub.html

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<!doctype html>
<title>URLs in embedded style sheets resolve relative to the document base URI</title>
<link rel=help href=https://drafts.csswg.org/css-values/#relative-urls>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<base href="http://{{hosts[alt][www]}}">
<style>
:root {
    --image-path: url("images/test.png");
}
#relative-image-url {
    background-image: url(images/test.png);
}

#relative-image-variable-url {
    background-image: var(--image-path);
}
</style>
<div id="relative-image-url"></div>
<div id="relative-image-variable-url"></div>
<script>
const ids = [
  "relative-image-url",
  "relative-image-variable-url"
];

for (let id of ids) {
    test(() => {
        const el = document.getElementById(id);
        const backgroundImageStyle = window.getComputedStyle(el)["background-image"];
        const baseRelativeImageURL = new URL("images/test.png", document.baseURI);
        assert_equals(backgroundImageStyle, `url("${baseRelativeImageURL.href}")`);
    }, "base-relative URL: " + id);
}
</script>