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<!doctype html>
<meta charset=utf-8>
<title>Node.appendChild: inserting a script and a style where the script modifies the style</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<body>
<script>
// <script> & <style> element tests.
test(() => {
window.happened = [];
window.style = document.createElement("style");
let styleSheet = null;
style.appendChild(new Text("body {}"));
const script = document.createElement("script");
script.textContent = `
styleSheet = style.sheet;
happened.push(style.sheet ? "sheet" : null);
style.appendChild(new Text("body {}"));
happened.push(style.sheet?.cssRules.length);
`;
const div = document.createElement("div");
div.appendChild(script);
div.appendChild(style);
assert_array_equals(happened, []);
document.body.appendChild(div);
assert_array_equals(happened, ["sheet", 2]);
assert_not_equals(style.sheet, styleSheet, "style sheet was created only once");
}, "An earlier-inserted <script> synchronously observes a later-inserted " +
"<style> (via a div) being applied");
test(() => {
window.happened = [];
window.style = document.createElement("style");
let styleSheet = null;
style.appendChild(new Text("body {}"));
const script = document.createElement("script");
script.textContent = `
styleSheet = style.sheet;
happened.push(style.sheet ? "sheet" : null);
style.appendChild(new Text("body {}"));
happened.push(style.sheet?.cssRules.length);
`;
const df = document.createDocumentFragment();
df.appendChild(script);
df.appendChild(style);
assert_array_equals(happened, []);
document.body.appendChild(df);
assert_array_equals(happened, ["sheet", 2]);
assert_not_equals(style.sheet, styleSheet, "style sheet was created only once");
}, "An earlier-inserted <script> synchronously observes a later-inserted " +
"<style> (via a DocumentFragment) being applied");
// <script> & <link rel=stylesheet> element tests.
test(() => {
window.happened = [];
window.link = document.createElement("link");
link.rel = "stylesheet";
link.href = "data:text/css,";
const script = document.createElement("script");
script.textContent = `
happened.push(link.sheet ? "sheet" : null);
`;
const df = document.createDocumentFragment();
df.appendChild(script);
df.appendChild(link);
assert_array_equals(happened, []);
document.body.appendChild(df);
assert_array_equals(happened, ["sheet"]);
}, "Earlier-inserted <script> (via a DocumentFragment) synchronously " +
"observes a later-inserted <link rel=stylesheet>'s CSSStyleSheet creation");
test(() => {
window.happened = [];
window.link = document.createElement("link");
link.rel = "stylesheet";
link.href = "data:text/css,";
const script = document.createElement("script");
script.textContent = `
happened.push(link.sheet ? "sheet" : null);
`;
const div = document.createElement("div");
div.appendChild(script);
div.appendChild(link);
assert_array_equals(happened, []);
document.body.appendChild(div);
assert_array_equals(happened, ["sheet"]);
}, "Earlier-inserted <script> (via a div) synchronously observes a " +
"later-inserted <link rel=stylesheet>'s CSSStyleSheet creation");
test(() => {
window.happened = [];
window.link = document.createElement("link");
link.rel = "stylesheet";
link.href = "data:text/css,";
const script = document.createElement("script");
script.textContent = `
happened.push(link.sheet ? "sheet" : null);
`;
assert_array_equals(happened, []);
document.body.append(script, link);
assert_array_equals(happened, ["sheet"]);
}, "Earlier-inserted <script> (via a append()) synchronously observes a " +
"later-inserted <link rel=stylesheet>'s CSSStyleSheet creation");
</script>
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