We used to check if the passed query looked like a tag name so we could bail out early, as we'd get those results from _searchIndex. But InspectorUtils.isCustomElementName does match some legitimate selectors, like div.a-b. Let's remove the check on custom element and trigger the search in such case. Original Revision: https://phabricator.services.mozilla.com/D259783 Differential Revision: https://phabricator.services.mozilla.com/D260238