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I'm aware that the syntax section mentions that only the first occurrence is replaced, but I just spent an hour on this gotcha, so I think it's important enough to mention in the intro paragraph.

Progressive web apps

Change the Lighthouse URL to its homepage, rather than the Chrome Extension download link. The homepage shows you all the different ways you can run Lighthouse (Extension, Node, CLI, DevTools).

Window: load event

Move the example to the top of the page.