{"json_modified": "2016-03-28T08:07:54.601344", "uuid": "bfebd867-205c-49bd-9ae3-bd214dc61462", "title": "Layout debugger", "url": "/en-US/docs/Mozilla/Debugging/Layout_Debugger", "tags": ["Developing Mozilla", "Guide", "Debugging", "Layout", "debugging"], "translations": [], "modified": "2016-02-28T00:25:17", "label": "Layout debugger", "localization_tags": [], "locale": "en-US", "id": 8709, "last_edit": "2015-04-29T10:30:25", "summary": "The Layout Debugger was written by David Baron as a replacement for the old <code>viewer.exe</code>. It's now available in any debug trunk build. The tool provides access to some advanced debugging facilities that can be useful when diagnosing and fixing layout bugs.", "sections": [{"id": "Using_the_Layout_Debugger", "title": "Using the Layout Debugger"}, {"id": "Onscreen_information", "title": "Onscreen information"}, {"id": "Visual_debugging", "title": "Visual debugging"}, {"id": "Event_debugging", "title": "Event debugging"}, {"id": "Reflow_Statistics", "title": "Reflow Statistics"}, {"id": "Paint_and_invalidate_information", "title": "Paint and invalidate information"}, {"id": "Paint_dumping", "title": "Paint dumping"}, {"id": "Invalidate_dumping", "title": "Invalidate dumping"}, {"id": "Paint_invalidate_dumping", "title": "Paint + invalidate dumping"}, {"id": "Event_information", "title": "Event information"}, {"id": "Event_dumping", "title": "Event dumping"}, {"id": "Motion_event_dumping", "title": "Motion event dumping"}, {"id": "Crossing_events_dumping", "title": "Crossing events dumping"}, {"id": "Webshells_and_content", "title": "Webshells and content"}, {"id": "Dump_webshells", "title": "Dump webshells"}, {"id": "Dump_content", "title": "Dump content"}, {"id": "Debug_frame_construction", "title": "Debug frame construction"}, {"id": "Dump_frames", "title": "Dump frames"}], "slug": "Mozilla/Debugging/Layout_Debugger", "review_tags": ["technical"]}