File: resolve-relative-to-stylesheet.html

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<!doctype html>
<title>URLs in a stylesheet resolve relative to the stylesheet</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>
<link id="stylesheet" rel=stylesheet href=support/relative-urls.css>
<div id="stylesheet-relative-image"></div>
<div id="stylesheet-relative-variable-image"></div>
<div id="stylesheet-relative-document-variable-image"></div>
<style>
    :root {
        --image-path-document: url("images/test.png");
    }
</style>
<script>
const ids = [
  "stylesheet-relative-image",
  "stylesheet-relative-variable-image",
  "stylesheet-relative-document-variable-image",
];

for (let id of ids) {
    test(() => {
        const el = document.getElementById(id);
        const backgroundImageStyle = window.getComputedStyle(el)["background-image"];

        const stylesheet = document.getElementById("stylesheet");
        const sheetRelativeImageURL = new URL("images/test.png", stylesheet.href);

        assert_equals(backgroundImageStyle, `url("${sheetRelativeImageURL.href}")`);
    }, "stylesheet-relative URL: " + id);
}
</script>