mozilla-central/layout/style/test/test_computed_style_bfcache_display_none.html

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Test Info:

<!doctype html>
<title>Test for getting the computed style on the root node of a display:none subtree in a document in the bfcache</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<p id="display"></p>
<script>
SimpleTest.waitForExplicitFinish();
let testDiv;
let loadedPromiseResolve;
const TEST_FILE1 = TEST_PATH + "file_computed_style_bfcache_display_none.html";
const TEST_FILE2 = TEST_PATH + "file_computed_style_bfcache_display_none2.html";
// Open a new window.
const w = window.open(TEST_FILE1);
waitForLoadMessage().then(() => {
// Take a reference to a node in the new window.
testDiv = w.document.getElementById('div');
// Open a new document so that the test div now refers to a node in a
// document in the bfcache.
w.location = TEST_FILE2;
return waitForLoadMessage();
}).then(() => {
// Compute styles for the node in the bfcache document.
is(w.getComputedStyle(testDiv).opacity, '1');
// Restore the bfcache document.
return goBack(w);
}).then(() => {
// Fetch the style once again.
is(w.getComputedStyle(testDiv).opacity, '1');
w.close();
SimpleTest.finish();
});
window.addEventListener('message', e => {
if (e.data === 'loaded' && loadedPromiseResolve) {
loadedPromiseResolve();
loadedPromiseResolve = undefined;
}
});
function waitForLoadMessage() {
return new Promise(resolve => {
loadedPromiseResolve = resolve;
});
}
function goBack(win) {
return new Promise(resolve => {
win.onpagehide = e => resolve(win);
win.history.back();
});
}
</script>