CSS-in-JS provides a syntax for turning your JavaScript into styles the browser can apply. Regardless of the framework you use, the result will look something like Listing 1.

Key Takeaways Start with basic concepts like selectors, properties, and box model before moving to layouts.Use online tools ...

CSS: Enter CSS to be applied to the HTML used in your tests. It is placed between <style> elements in the header portion of the page. HTML: This area allows you to enter HTML to be used in your tests.