Seonglae ChoFor precise, don't use local LH, go here http://web.dev/measure
great tools for numbering
Lighthouse Usages
Lighthouse | Tools for Web Developers | Google Developers
Lighthouse is an open-source, automated tool for improving the quality of web pages. You can run it against any web page, public or requiring authentication. It has audits for performance, accessibility, progressive web apps, SEO and more. You can run Lighthouse in Chrome DevTools, from the command line, or as a Node module.
https://developers.google.com/web/tools/lighthouse
Headings and landmarks
Screen readers have commands to quickly jump between headings or to specific landmark regions. In fact, a survey of screen reader users found that they most often navigate an unfamiliar page by exploring the headings. By using correct heading and landmark elements, you can dramatically improve the navigation experience on your site for users of assistive technologies.
https://web.dev/headings-and-landmarks/#use-landmarks-to-aid-navigation
