July 2018
Intermediate to advanced
354 pages
8h 51m
English
Content preview from Progressive Web Application Development by Example
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Lighthouse and headless testing
Recently, the Chrome team also released a tool called Puppeteer (https://github.com/GoogleChrome/puppeteer), which executes a headless instance of Chromium. This is not Chrome, but a variation in the code base upon which many popular applications such as Visual Studio Code are built.
A headless browser can execute a page, but not with the ability to view the page. Because the page is not visibly rendered, some of the tests are not run. You should keep this mind when executing an audit using a headless browser.
The ability to exercise Lighthouse against a headless browser has opened up opportunities for the tool to be integrated in different tools. For example, WebPageTest, HTTPArchive, Calibre, and others use ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.