add_task(async function () {
const URL =
"data:text/html,";
const foregroundTab = gBrowser.selectedTab;
const backgroundTab = BrowserTestUtils.addTab(gBrowser);
// Ensure tab is still in the foreground.
is(
gBrowser.selectedTab,
foregroundTab,
"foregroundTab should still be selected"
);
// Load the second tab in the background.
const loadedPromise = BrowserTestUtils.browserLoaded(
backgroundTab.linkedBrowser,
/* includesubframes */ false,
URL
);
BrowserTestUtils.loadURIString(backgroundTab.linkedBrowser, URL);
await loadedPromise;
// Get active element in the tab.
let tagName = await SpecialPowers.spawn(
backgroundTab.linkedBrowser,
[],
async function () {
// Spec asks us to flush autofocus candidates in the
// `update-the-rendering` step, so we need to wait
// for a rAF to ensure autofocus candidates are
// flushed.
await new Promise(r => {
content.requestAnimationFrame(r);
});
return content.document.activeElement.tagName;
}
);
is(
tagName,
"INPUT",
"The background tab's focused element should be the "
);
is(
gBrowser.selectedTab,
foregroundTab,
"foregroundTab tab should still be selected, shouldn't cause a tab switch"
);
is(
document.activeElement,
foregroundTab.linkedBrowser,
"The background tab's focused element should not cause the tab to be selected"
);
// Cleaning up.
BrowserTestUtils.removeTab(backgroundTab);
});