Lesson 4. Testing and debugging tools

The main thing in the lesson

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Chrome is the most popular browser, so when creating an application, you should focus on the correct work in it.
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Chrome DevTools allows you to display code and error messages, edit HTML and CSS, measure page load speed.
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DevTools on iOS is a web inspector in Safari.
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Eruda is a console with developer tools for debugging applications that works like a browser console, convenient for working with the mobile web.
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The app should launch in less than 5 seconds so that users don’t leave before it opens.
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LightHouse is a tool that will help you analyze the speed of opening and running the application.

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