function test() { waitForExplicitFinish(); gBrowser.selectedTab = gBrowser.addTab(); gBrowser.selectedBrowser.addEventListener("load", function () { gBrowser.selectedBrowser.removeEventListener("load", arguments.callee, true); let doc = gBrowser.contentDocument; let tooltip = document.getElementById("aHTMLTooltip"); let i = doc.getElementById("i"); ok(!FillInHTMLTooltip(i), "No tooltip should be shown when @title is null"); i.title = "foo"; ok(FillInHTMLTooltip(i), "A tooltip should be shown when @title is not the empty string"); i.pattern = "bar"; ok(FillInHTMLTooltip(i), "A tooltip should be shown when @title is not the empty string"); gBrowser.removeCurrentTab(); finish(); }, true); content.location = "data:text/html,"; }