add_task(async function () { await BrowserTestUtils.withNewTab( { gBrowser, url: "data:text/html,", }, async function (browser) { await SpecialPowers.spawn(browser, [""], function () { let tttp = Cc[ "@mozilla.org/embedcomp/default-tooltiptextprovider;1" ].getService(Ci.nsITooltipTextProvider); let i = content.document.getElementById("i"); ok( !tttp.getNodeText(i, {}, {}), "No tooltip should be shown when @title is null" ); i.title = "foo"; ok( tttp.getNodeText(i, {}, {}), "A tooltip should be shown when @title is not the empty string" ); i.pattern = "bar"; ok( tttp.getNodeText(i, {}, {}), "A tooltip should be shown when @title is not the empty string" ); }); } ); });