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Test Info:

add_task(async function () {
const html =
'<p id="p1" title="tooltip is here">This paragraph has a tooltip.</p>';
await BrowserTestUtils.openNewForegroundTab(
gBrowser,
"data:text/html," + html
);
await SpecialPowers.pushPrefEnv({ set: [["ui.tooltip.delay_ms", 0]] });
await BrowserTestUtils.synthesizeMouseAtCenter(
"#p1",
{ type: "mousemove" },
gBrowser.selectedBrowser
);
await BrowserTestUtils.synthesizeMouseAtCenter(
"#p1",
{},
gBrowser.selectedBrowser
);
// Wait until the tooltip timeout triggers that would normally have opened the popup.
await new Promise(resolve => setTimeout(resolve, 0));
is(
document.getElementById("aHTMLTooltip").state,
"closed",
"local tooltip is closed"
);
is(
document.getElementById("remoteBrowserTooltip").state,
"closed",
"remote tooltip is closed"
);
gBrowser.removeCurrentTab();
});