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Test Info:

/* Any copyright is dedicated to the Public Domain.
"use strict";
// Test confirms that XUL attributes don't show up as empty
// attributes after being deleted
const TEST_URL = URL_ROOT_SSL + "doc_markup_xul.xhtml";
add_task(async function () {
await SpecialPowers.pushPermissions([
{ type: "allowXULXBL", allow: true, context: URL_ROOT_SSL },
]);
const { inspector } = await openInspectorForURL(TEST_URL);
const panelFront = await getNodeFront("#test", inspector);
ok(
panelFront.hasAttribute("id"),
"panelFront has id attribute in the beginning"
);
info("Removing panel's id attribute");
const onMutation = inspector.once("markupmutation");
await removeContentPageElementAttribute("#test", "id");
info("Waiting for markupmutation");
await onMutation;
is(
panelFront.hasAttribute("id"),
false,
"panelFront doesn't have id attribute anymore"
);
});